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Random effects model, mean difference, 95% confidence interval and I2 statistics.</p> <p id="spar0001" class="elsevierStyleSimplePara elsevierViewall">MD: mean difference; seTE: standard error of treatment effect; TE: treatment effect.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "W. Masson, L. Barbagelata, M. Lobo, J.P. Nogueira" "autores" => array:4 [ 0 => array:2 [ "nombre" => "W." "apellidos" => "Masson" ] 1 => array:2 [ "nombre" => "L." "apellidos" => "Barbagelata" ] 2 => array:2 [ "nombre" => "M." "apellidos" => "Lobo" ] 3 => array:2 [ "nombre" => "J.P." "apellidos" => "Nogueira" ] ] ] ] ] "idiomaDefecto" => "en" "Traduccion" => array:1 [ "es" => array:9 [ "pii" => "S0014256521002162" "doi" => "10.1016/j.rce.2021.11.003" "estado" => "S300" "subdocumento" => "" "abierto" => array:3 [ "ES" => false "ES2" => false "LATM" => false ] "gratuito" => false "lecturas" => array:1 [ "total" => 0 ] "idiomaDefecto" => "es" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S0014256521002162?idApp=WRCEE" ] ] "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S2254887422000066?idApp=WRCEE" "url" => "/22548874/0000022200000004/v1_202204130611/S2254887422000066/v1_202204130611/en/main.assets" ] "itemAnterior" => array:20 [ "pii" => "S2254887421001223" "issn" => "22548874" "doi" => "10.1016/j.rceng.2020.11.012" "estado" => "S300" "fechaPublicacion" => "2022-04-01" "aid" => "1940" "copyright" => "The Author(s)" "documento" => "article" "crossmark" => 1 "licencia" => "http://creativecommons.org/licenses/by-nc-nd/4.0/" "subdocumento" => "fla" "cita" => "Rev Clin Esp. 2022;222:235-40" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "en" => array:13 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">Special article</span>" "titulo" => "Consensus on the management of hyperkalemia in patients with heart failure: Recommendations from the SEC-SEMI" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => array:2 [ 0 => "en" 1 => "es" ] "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "235" "paginaFinal" => "240" ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Consenso sobre el manejo de la hiperpotasemia en pacientes con insuficiencia cardíaca: recomendaciones de la SEC-SEMI" ] ] "contieneResumen" => array:2 [ "en" => true "es" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1862 "Ancho" => 2675 "Tamanyo" => 227788 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Algorithm for management according to potassium levels.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "L. 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A narrative review" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "241" "paginaFinal" => "250" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "A. López-Sampalo, M.R. Bernal-López, R. Gómez-Huelgas" "autores" => array:3 [ 0 => array:3 [ "nombre" => "A." "apellidos" => "López-Sampalo" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] ] ] 1 => array:4 [ "nombre" => "M.R." "apellidos" => "Bernal-López" "email" => array:1 [ 0 => "rosa.bernal@ibima.eu" ] "referencia" => array:3 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] 2 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 2 => array:3 [ "nombre" => "R." "apellidos" => "Gómez-Huelgas" "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Málaga (UMA), Málaga, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Síndrome de COVID-19 persistente. Una revisión narrativa" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1287 "Ancho" => 2500 "Tamanyo" => 228719 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Etiopathogenetic mechanisms of long COVID-19.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">In March 2020, the World Health Organization (WHO) declared a pandemic due to the illness caused by coronavirus 2019 (COVID-19), caused by the type 2 coronavirus infection responsible for severe acute respiratory syndrome (SARS-CoV-2). The clinical and epidemiological characteristics, pathogenesis, and complications of patients with COVID-19 in the acute phase have been widely reported, however the long-term consequences of the disease are yet not well defined<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,2</span></a>.</p><p id="par0010" class="elsevierStylePara elsevierViewall">As of early July 2021, over 191 million people had already been infected by SARS-CoV-2 around the world and the pandemic was still spreading widely in multiple countries. In its acute phase, severe COVID-19 is characterised by acute pulmonary disease that can manifest as pneumonia and with acute respiratory distress syndrome<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a>. Numerous extrapulmonary manifestations have been described in multiple systems, including haematological, cardiovascular, renal, digestive, neurological, endocrine, ophthalmological and dermatological symptoms<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3,4</span></a>.</p><p id="par0015" class="elsevierStylePara elsevierViewall">Mean symptom duration in the acute phase of the disease is 11.5 ± 5.7 days<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a>. However, it has been observed that up to 10–15% of patients with COVID-19 can present persistent symptomatology weeks or even months after infection, though this percent may be even higher. The symptomatology reported after the acute phase is highly heterogeneous and includes fatigue, dyspnoea, chest pain, palpitations, gastrointestinal symptoms, mental confusion, anxiety, and depression, among many other associated symptoms<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a>.</p><p id="par0020" class="elsevierStylePara elsevierViewall">Recent studies suggest that the so-called long COVID syndrome is emerging as a prevalent syndrome and refers to a highly diverse set of symptoms that persist long after a confirmed SARS-CoV-2 infection yet does not seem to have a clear association with the severity of the acute phase of COVID-19<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a>.</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Definition of long COVID-19 syndrome</span><p id="par0025" class="elsevierStylePara elsevierViewall">As of yet there is no consensus regarding the definition and timeline associated with the long-term symptoms of COVID-19. The terminology used to describe this clinical presentation varies widely in the literature and includes terms, among others, such as ‘long haulers’, ‘late sequelae of COVID-19’, ‘chronic COVID-19 syndrome’, ‘post-acute COVID-19 syndrome’ (PACS), and ‘persistent COVID-19 syndrome’<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a>.</p><p id="par0030" class="elsevierStylePara elsevierViewall">One of the most widely used terms is long COVID, collectively coined by patients themselves through social media, as the contraction of the long-term, cyclical, progressive, and multiphase disease<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a>. The WHO currently recommends using the term ‘post-COVID-19 condition’ to refer to this clinical presentation, as it does not imply causality nor duration, and there are already specific ICD-10 (U09) and ICD-11 (RA02) codes to identify it<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a>.</p><p id="par0035" class="elsevierStylePara elsevierViewall">With the aim of unifying criteria, the National Institute for Health and Care Excellence proposed the following definitions to describe the various symptomatic phases of SARS-CoV-2 infection<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a>. Acute COVID-19 generally lasts up to 4 weeks from the onset of symptoms. When symptoms last longer than 4 weeks or late or long-term symptoms appear, then the term ‘post-acute COVID-19’ is used. The latter term encompasses both patients with long COVID (LC) and post-COVID-19 sequelae.</p><p id="par0040" class="elsevierStylePara elsevierViewall">LC applies to symptoms that remain 4 or even 12 weeks beyond the acute infection, or that appear later on in the case of subjects with asymptomatic infection, but without the presence of irreversible organ damage. In terms of post-COVID-19 sequelae, patients tend to present a history of severe acute COVID-19 and symptoms resulting from structural damage secondary to complications suffered during the acute phase<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>. Making this distinction is important since these 2 sub-types of post-acute COVID-19 affect different patient profiles. While sequelae are predominant in older males, typically around 70 years-old and with associated comorbidities, LC tends to present in middle-aged women, around 40 years-old, without significant health issues.</p><p id="par0045" class="elsevierStylePara elsevierViewall">Three clinical phenotypes within LC have been described: permanent (no changes during follow-up), relapsing/recurring (episodic and fluctuating course, with intervals of symptom exacerbation and remission), and slowly progressive improvement<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a>.</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Pathophysiology</span><p id="par0050" class="elsevierStylePara elsevierViewall">The fact that some patients with COVID-19 experience symptoms after recovering from acute infection is to be expected. Other infections, such as those caused by the Epstein-Barr virus, <span class="elsevierStyleItalic">Giardia lamblia, Coxiella burnetii, Borrelia burgdorferi</span> (Lyme disease) and the Ross River virus, as well as other coronaviruses such as SARS-CoV and MERS-CoV (causes of severe acute respiratory syndrome [SARS] and Middle East respiratory syndrome [MERS], respectively), are also associated with a higher risk of post-infectious sequelae.</p><p id="par0055" class="elsevierStylePara elsevierViewall">These sequelae include long-term symptoms (months, even years) in the absence of active infection and include debilitating fatigue, musculoskeletal pain, neurocognitive difficulties, and mood disorders<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a>. These acute, post-infection syndromes show a clear clinical and pathophysiological parallel with long COVID syndrome, particularly with SARS and MERS due to the phylogenetic similarities between the pathogenic coronaviruses responsible. The overlap of the genome sequence identity of SARS-CoV-2 is 79% with SARS-CoV-1 and 50% with MERS-CoV<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">15,16</span></a>.</p><p id="par0060" class="elsevierStylePara elsevierViewall">The potential mechanisms that contribute to the pathophysiology of LC are not yet clear, as numerous factors have been suggested (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>). A key element may be the presence of a state of chronic hyperinflammation<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a>. The virus, in relation to the lungs, activates innate immunity, resulting in an inflammatory cytokine release cascade, including interleukin 6 (IL-6), IL-1, tumour necrosis factor alpha, and reactive oxygen species. This systemic cytokine elevation becomes involved in the development of pulmonary fibrosis<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> and cardiac and neurological lesions secondary to endothelial damage caused by the activation of fibroblasts with collagen and fibronectin deposition.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">In addition, damage to the blood–brain barrier (BBB) has been observed with increased permeability for neurotoxic substances. Likewise, elevated levels of IL-6 can disrupt muscle metabolic homoeostasis<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> and exacerbate muscle loss, which is why some authors postulate that skeletal muscle may be impacted both by direct infection by SARS-CoV-2 of the myocytes, cells with elevated expression of the angiotensin-converting enzyme 2 receptor (ACE2), and indirectly through systemic cytokine release and subsequent muscle homoeostasis disruption, resulting in fatigue and muscle weakness.</p><p id="par0070" class="elsevierStylePara elsevierViewall">Some studies<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> have aimed to detect the presence of T cells and NK lymphocytes in these patients and so it seems long COVID is characterised by alterations in the TCD4+ and TCD8+ cells, with two clinically important profiles distinguished: one that is more inflammatory (decrease in TCD4+ and increase in TCD8+) and another that is more immune (increase in TCD4+ and TCD8+).</p><p id="par0075" class="elsevierStylePara elsevierViewall">Other suggested mechanisms include the autoimmune, via the existence of autoantibodies that act against modulator proteins which would disrupt immune function<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a>. Another mechanism that may be involved is the hypercoagulability state associated with SARS-CoV-2 infection (thromboinflammatory state), responsible for the disproportionately high (20-30%) rates of thrombotic complications observed in patients with COVID-19<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a>.</p><p id="par0080" class="elsevierStylePara elsevierViewall">In addition, a hypothesis has been proposed in which SARS-CoV-2 infection may affect the autonomic nervous system,<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> resulting in autonomic dysfunction mediated by the virus itself. This dysautonomia manifests as various syndromes of orthostatic intolerance including orthostatic hypotension, vasovagal syncope, and postural orthostatic tachycardia syndrome (POTS).</p><p id="par0085" class="elsevierStylePara elsevierViewall">Another etiopathogenetic hypothesis may be the persistence of the virus in the body due to a weak or absent antibody response<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a>, relapses or reinfections, and other factors related to COVID-19 such as: immobilisation, nutrition disorders, mental disorders such as post-traumatic stress, or alterations in the intestinal microbiota<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a>.</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Epidemiology and risk factors</span><p id="par0090" class="elsevierStylePara elsevierViewall">Persistent symptoms following SARS-CoV-2 infection occur in both patients who required hospitalisation due to severe COVID-19 presentation and those who presented with mild paucisymptomatic disease, and even in subjects with asymptomatic infection<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a>.</p><p id="par0095" class="elsevierStylePara elsevierViewall">Published studies have produced varying results on the prevalence of LC (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>). In the United Kingdom, around 10% of patients with documented SARS-CoV-2 infection remained symptomatic after 3 weeks, and a smaller proportion during months following acute infection<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a>.</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0100" class="elsevierStylePara elsevierViewall">An observational cohort study conducted in Michigan (United States)<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> which used a telephone survey to evaluate 488 patients discharged from hospital due to COVID-19 found that 32.6% of the patients reported persistent symptoms at 3 months, with 18.9% of the subjects with new or worsening symptoms; dyspnoea (23%) was the most prevalent symptom. A total of 38.5% of the patients were not able to return to their activities of daily living and 48.8% reported being emotionally affected by their health.</p><p id="par0105" class="elsevierStylePara elsevierViewall">Other studies have reported even higher rates of prevalence. In Italy<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a>, 87.4% of 143 patients discharged from hospital due to COVID-19 presented persistent symptoms at mean follow-up of 2 months after the onset of symptoms, with the most common symptoms being fatigue (53.1%), dyspnoea (43.4%), joint pain (27.3%), and chest pain (21.7%). In a study conducted in France<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a>, 66% of patients still had symptoms at 60 days of follow-up. In a prospective cohort study conducted in Wuhan (China)<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> which evaluated 1,733 subjects 6 months after onset of COVID-19 symptoms, the majority of the patients (76%) reported at least one symptom, the most common being fatigue/muscle weakness (63%), sleep difficulties (26%), and anxiety/depression (23%).</p><p id="par0110" class="elsevierStylePara elsevierViewall">There are 2 studies in Spain that stand out<a class="elsevierStyleCrossRefs" href="#bib0160"><span class="elsevierStyleSup">32,33</span></a>. One retrospective multicentre cohort study conducted at 4 centres in Andalusia<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> analysed symptom prevalence in 962 patients who required hospitalisation during the acute phase: up to 63.9% presented symptoms after 6 months of follow-up, predominantly respiratory symptoms (42%), followed by systemic (36.1%), neurological (20.8%), and psychological (12.2%). Another national study conducted in the Primary Care service<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> via an online survey with 2,120 individual participants with a history of COVID-19 concluded that 5% of patients presented at least one symptom after an average of 185 days post-acute infection.</p><p id="par0115" class="elsevierStylePara elsevierViewall">One of the main lines of investigation is the development of tools to be able to predict the likelihood of developing LC. The risk factors related to LC have not been described in the majority of previous studies. It has been suggested that experiencing more than 5 symptoms in the first 7 days increases the risk of developing persistent symptoms<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a>. Though the presence of anosmia, particularly in adults over the age of 70, has been related to a better prognosis in patients hospitalised due to COVID-19<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a>, it is considered to be the most predictive symptom for LC<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>.</p><p id="par0120" class="elsevierStylePara elsevierViewall">A German study<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a>, which included 958 non-hospitalised patients, found a significant association between the presence of long-term symptoms and a lower baseline level of IgG subclass antibodies, and the presence of anosmia and diarrhoea during acute COVID-19. Persistent symptoms have also been related to female sex, a larger number of symptoms at the start of the clinical picture, and admission to Intensive Care<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a>.</p><p id="par0125" class="elsevierStylePara elsevierViewall">In summary, and in the absence of more rigorous studies, it is estimated that around 10–20% of subjects infected with SARS-CoV-2 will develop LC, although this prevalence varies due to the differences in methodology used and the populations analysed, particularly between studies including hospitalised patients and outpatient patients. What’s more, in many cases no differentiation is made between true persistence of symptoms and sequelae of severe acute disease<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>.</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Symptomatology</span><p id="par0130" class="elsevierStylePara elsevierViewall">The clinical presentation of patients with long COVID is highly heterogeneous. Over 200 associated symptoms affecting different organs and systems have been described<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> (<a class="elsevierStyleCrossRef" href="#fig0010">Fig. 2</a>). The most common long-term symptoms are fatigue (52%), cardiorespiratory symptoms (30–42%), and neurological symptoms (40%)<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a>, including symptoms of dysautonomia<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a>.</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Symptoms and respiratory sequelae</span><p id="par0135" class="elsevierStylePara elsevierViewall">The lung is the organ that is most affected by SARS-CoV-2 infection. Therefore, persistent respiratory symptoms and exercise limitations are common following severe COVID-19. The most common persistent respiratory symptom is dyspnoea,<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> followed by cough and chest pain<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">29,40</span></a>. The proportion of symptoms that are due to pulmonary sequelae is not well defined. Venous thromboembolism (VTE) and pulmonary fibrosis are the most significant pulmonary sequelae and, unlike other post-acute sequelae, present a clear association with the severity of the infection during its initial phase, and are more common in patients requiring admission to intensive care units and those in need of chronic home oxygen therapy.</p><p id="par0140" class="elsevierStylePara elsevierViewall">The reported prevalence of VTE varies across the different studies (18–42%)<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a>. It has been hypothesised that pulmonary artery occlusions could be caused by local pulmonary thrombi within the context of the inflammatory response (thromboinflammation)<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a>. However, the long-term risks of chronic pulmonary embolism and consequent pulmonary hypertension are unknown.</p><p id="par0145" class="elsevierStylePara elsevierViewall">Some studies in hospitalised patients report the onset of pulmonary fibrosis in up to 40% during subsequent follow-up<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">43,44</span></a>. The onset of pulmonary fibrosis is related to the duration and severity of the disease, as well as advanced age<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">43,44</span></a>.</p><p id="par0150" class="elsevierStylePara elsevierViewall">While descriptions of findings via high-resolution computed tomography (HRCT) remain scarce, after the acute phase 3 types of radiological patterns have been observed<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">45</span></a>: the first in which there is a predominance of ground-glass and organisational areas; a second pattern in which fibrosing changes in the septal thickening are observed, and a third pattern in which a combination of the 2 previous patterns occurs. The first pattern responds to low-dose corticosteroids over an extended period, while the response of the second is little to none.</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Neurocognitive symptoms</span><p id="par0155" class="elsevierStylePara elsevierViewall">It was initially thought that SARS-CoV-2 did not cross the BBB, but post-mortem studies have shown that the virus broadly attacks the central nervous system. The entry route for SARS-CoV-2 is the transmembrane enzyme protein ACE2, to which it binds with excellent affinity via the S spike protein. The ACE2 receptor expresses widely in the endothelial cells of the brain<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">46</span></a>, and this S protein can directly damage the integrity of the BBB, and also induce a strong immune response generated by the cytokine release. In addition, it also seems that the virus affects the peripheral nervous system via the interaction with ACE2 receptors, which could result in neuromuscular complications<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">47</span></a>.</p><p id="par0160" class="elsevierStylePara elsevierViewall">During ongoing infection, around 36% of cases develop neurological symptoms<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">48</span></a>, of which headache is the most frequent, both in the acute phase and in LC. These headaches are similar to migraines,48 and often refractory to typical analgesics, which is attributed to elevated levels of circulating cytokines. Cognitive impairment has also been observed, sometimes in a fluctuating manner, with symptoms such as ‘brain fog’ that can manifest as difficulty concentrating, memory loss, receptive language or impaired executive functions<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">49</span></a>. Anosmia and ageusia are also common and lingering, as are sleep disorders.</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Cardiac symptoms and autonomic nervous system symptoms</span><p id="par0165" class="elsevierStylePara elsevierViewall">Persistent chest pain has been reported in 20–30% of patients, though coronary artery disease must always be ruled out, particularly in patients with cardiovascular risk factors. In the event of persistent symptoms, the presence of myocarditis must be suspected, which has been reported via magnetic resonance imaging (MRI) in up to 60% of patients after 2 months of acute symptoms<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">50</span></a>.</p><p id="par0170" class="elsevierStylePara elsevierViewall">The existence of pericardial effusion, generally low in numbers, can be observed via MRI in 20% of the subjects during the acute phase, however symptomatic pericarditis is less frequent<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a>. Palpitations are also common, though if recurrent these suggest a dysautonomia clinical picture such as inappropriate sinus tachycardia, or POTS if associated with symptoms of orthostatic hypotension.</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Digestive symptoms</span><p id="par0175" class="elsevierStylePara elsevierViewall">While some follow-up studies on patients hospitalised due to COVID-19 have not reported gastrointestinal or significant hepatobiliary sequelae<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a>, other authors have pointed out that digestive manifestations are present in over half of those affected by LC, including symptoms such as diarrhoea, meteorism, dyspepsia, abdominal pain, nausea, and vomiting. Some studies have reported the existence of changes to intestinal microbiota following acute infection, which remains in patients with LC<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a>. In addition, it has been observed that the ileum is a preferred target of SARS-CoV-2, where it is able to remain for months<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">52</span></a>.</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Endocrine disorders</span><p id="par0180" class="elsevierStylePara elsevierViewall">The acute phase of SARS-CoV-2 infection has been associated with stress hyperglycaemia in patients without known diabetes mellitus, as well as worse glycaemic control in those with prior diabetes<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">53</span></a>. Hyperglycaemia and the onset of diabetes mellitus also appear during follow-up of patients with LC<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">54</span></a>. Similarly, thyroid alterations have also been reported, such as Hashimoto’s disease<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">55</span></a>, Graves’ disease<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">56</span></a>, or subacute thyroiditis<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">57</span></a>.</p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Dermatological symptoms</span><p id="par0185" class="elsevierStylePara elsevierViewall">The most commonly reported sequela is hair loss which, according to a Chinese post-COVID-19 study, affected 20% of patients at 6 months follow-up<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">30,58</span></a>. This hair loss may be attributed to telogen effluvium resulting from a viral infection or a stress response<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a>.</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Psychological symptoms</span><p id="par0190" class="elsevierStylePara elsevierViewall">Individuals with COVID-19 may experience a series of psychiatric symptoms that persist or present after the initial infection<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a>. The most frequently reported symptoms are anxiety and depression (30–40%), followed by post-traumatic stress disorder, insomnia, and obsessive-compulsive symptomatology.</p></span></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Follow-up and clinical-therapeutic approach</span><p id="par0195" class="elsevierStylePara elsevierViewall">As we have seen, the symptoms of LC are just as heterogeneous as those observed in the acute phase of the disease and can manifest in an ongoing, fluctuating, or changing manner.</p><p id="par0200" class="elsevierStylePara elsevierViewall">In the absence of a solid and standardised foundation for patients with long COVID, various clinical guidelines have been published with recommendations on long-term follow-up for said patients, both internationally<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> and nationally<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">12,60,61</span></a>, and post-COVID-19 specialized consultation units have been set up in many hospitals.</p><p id="par0205" class="elsevierStylePara elsevierViewall">These recommendations coincide in that, due to the complexity of this viral infection and the potential involvement of multiple systems and organs, a multidisciplinary assessment involving different medical specialists is needed to allow doctors to optimally monitor patient progress and offer the best possible care and management. Said recommendations suggest the need for an initial evaluation that includes a comprehensive physical examination, lab testing, and imaging tests. In addition, studying patient comorbidities and social and functional staus is also essential. All of this will enable doctors to perform a comprehensive assessment of the patient’s baseline condition<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a>.</p><p id="par0210" class="elsevierStylePara elsevierViewall">The proposed follow-up strategies recommend performing a basic analysis that includes a complete blood count, erythrocyte sedimentation rate, blood sugar, lipid profile, renal, ions, hepatic panel, albumin, lactate dehydrogenase, C-reactive protein, thyroid function tests, iron metabolism, vitamin B<span class="elsevierStyleInf">12</span>, folic acid, vitamin D, calcium, phosphorus, and coagulation tests as well as, in certain circumstances, and depending on the medical history and examination, other specific analytical assessments according to patient symptoms. In certain circumstances (persistent lymphopenia or altered lymphocyte count), it may be convenient to perform a basic cellular immunity study, including lymphocyte subpopulations (B cells, T cells, TCD4+, TCD8+), immunoglobulins, and a supplementary study to enable us to rule out other alternative illnesses<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>.</p><p id="par0215" class="elsevierStylePara elsevierViewall">The need to perform imaging studies in the follow-up of patients with COVID-19 remains a topic of controversy. The British Thoracic Society guidelines recommend performing a chest X-ray at 12 weeks in those patients who have experienced significant respiratory illness during the acute phase and, if alterations are observed, performing a chest CT with high-resolution reconstructions and contrast, according to the pulmonary thromboembolism protocol<a class="elsevierStyleCrossRefs" href="#bib0310"><span class="elsevierStyleSup">62,63</span></a>.</p><p id="par0220" class="elsevierStylePara elsevierViewall">Other authors recommend performing a baseline pre-contrast high-resolution chest CT at 6 and 12 months and, if fibrotic alterations persist, to repeat this at 24 and 36 months<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">64</span></a>. One reasonable instruction would be to perform a chest CT in patients with persistent respiratory symptoms and alterations in their pulmonary function tests (PFT), or if anomalies persist in chest X-rays 3 months post-discharge or resolution of clinical pneumonia, this being a time when acute lesions should have resolved and would now be considered chronic<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">64</span></a>.</p><p id="par0225" class="elsevierStylePara elsevierViewall">Other supplementary tests that could be conducted depending on symptomatology include electrocardiogram, transthoracic echocardiogram, PFT, stress test, Holter monitor, ambulatory blood pressure monitoring or self-measured blood pressure monitoring, tilt table test for patients with dysautonomia symptomatology, and any other test considered necessary after conducting a thorough medical history and physical examination<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>.</p><p id="par0230" class="elsevierStylePara elsevierViewall">The guidelines recommend an initial consultation with patients who present persistent symptoms 4 weeks after acute COVID-19. This assessment may be in-person or over the phone depending on the warning signs, need to perform a physical examination, the patient’s medical history, the severity and impact of the symptoms on their quality of life, or difficulties communicating. Follow-up strategies adhere to stricter protocols in hospitalised patients, with the recommendation being an initial telephone assessment at 4 weeks post-hospital discharge, followed by an in-person appointment at 12 weeks. If at that time the patient is asymptomatic, they will be given the all-clear; otherwise, they will be scheduled for follow-up<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a>.</p><p id="par0235" class="elsevierStylePara elsevierViewall">The use of questionnaires or health measurement scales has been proposed as potentially useful in these patients since they allow doctors to make a comparison with their prior health status. It also enables follow-up of symptom evolution and helps determine the prognosis of the disease and standardise criteria among health professionals<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a>. Diverse scales are currently used to evaluate the most frequent symptoms (<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>), however there is a need to develop a specific measurement scale that globally reflects how these patients are affected<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>.</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0240" class="elsevierStylePara elsevierViewall">In general, there is a trend towards spontaneous improvement of persistent post-COVID-19 symptoms, however it is difficult to determine the percent of patients who improve, and the time needed to achieve improvement, based on the heterogeneity of the studies published to date. Some prospective studies indicate that COVID-19 vaccination in patients with LC may significantly improve persistent symptoms, however more data are needed to confirm this theory<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">67</span></a>.</p><p id="par0245" class="elsevierStylePara elsevierViewall">Though various national and international clinical trials are currently under way, no specific treatment for LC is currently available. While we wait for results that can guide us towards more effective and specific therapies, in the majority of cases symptomatic treatment is used, both pharmacological (analgesics, anti-inflammatory agents, bronchodilators, cough suppressants, antiemetic agents, antidepressants, anxiolytics, etc.) and non-pharmacological (food supplements, vitamin B<span class="elsevierStyleInf">12</span>, vitamin D, omega 3). Psychological and emotional support is also essential for these patients, and the need for multidisciplinary rehabilitation services must be considered (occupational therapy, physical therapy).</p></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Conclusions</span><p id="par0250" class="elsevierStylePara elsevierViewall">Persistent symptomatology and adverse events are frequent following SARS-CoV-2 infection, particularly, though not exclusively, after hospitalisation for severe COVID-19. Given the increase in cases and their potential impact on health care systems, there is a need to develop specific health plans and clinical follow-up programs with a multidisciplinary nature. This will help guarantee adequate care for this group, as achieving the quality care that these patients deserve may seem a challenge due to the excess demand on the national healthcare system at the current moment. Likewise, to improve clinical practice in this field, it is crucial to promote research strategies that make it possible to improve our knowledge of the pathophysiological aspects of the syndrome, harmonise diagnostic criteria, and develop effective therapies.</p></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Data availability</span><p id="par0255" class="elsevierStylePara elsevierViewall">Data will be made available on request.</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Funding</span><p id="par0260" class="elsevierStylePara elsevierViewall">This paper received support from the <span class="elsevierStyleGrantSponsor" id="gs0005">Center for Biomedical Research Network</span> (CIBERObn, <span class="elsevierStyleGrantNumber" refid="gs0005">CB06/03/0018</span>) from ISCIII-Madrid (Spain), co-financed by the <span class="elsevierStyleGrantSponsor" id="gs0010">European Regional Development Fund</span> (ERDF).</p></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Conflicts of interest</span><p id="par0265" class="elsevierStylePara elsevierViewall">María Rosa Bernal-López receives support from the “Nicolás Monardes” program (C1-0005-2020), from the Government of Andalusia, and from the “Miguel Servet Tipo II” program (CPII/00014), from ISCIII-Madrid (Spain), and Almudena López-Sampalo, from “Río Hortega” (CM21/00110). The two latter programs are co-financed by the European Regional Development Fund (ERDF).</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:15 [ 0 => array:3 [ "identificador" => "xres1692842" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec1499761" "titulo" => "Keywords" ] 2 => array:3 [ "identificador" => "xres1692843" "titulo" => "Resumen" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0010" ] ] ] 3 => array:2 [ "identificador" => "xpalclavsec1499760" "titulo" => "Palabras clave" ] 4 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 5 => array:2 [ "identificador" => "sec0010" "titulo" => "Definition of long COVID-19 syndrome" ] 6 => array:2 [ "identificador" => "sec0015" "titulo" => "Pathophysiology" ] 7 => array:2 [ "identificador" => "sec0020" "titulo" => "Epidemiology and risk factors" ] 8 => array:3 [ "identificador" => "sec0025" "titulo" => "Symptomatology" "secciones" => array:7 [ 0 => array:2 [ "identificador" => "sec0030" "titulo" => "Symptoms and respiratory sequelae" ] 1 => array:2 [ "identificador" => "sec0035" "titulo" => "Neurocognitive symptoms" ] 2 => array:2 [ "identificador" => "sec0040" "titulo" => "Cardiac symptoms and autonomic nervous system symptoms" ] 3 => array:2 [ "identificador" => "sec0045" "titulo" => "Digestive symptoms" ] 4 => array:2 [ "identificador" => "sec0050" "titulo" => "Endocrine disorders" ] 5 => array:2 [ "identificador" => "sec0055" "titulo" => "Dermatological symptoms" ] 6 => array:2 [ "identificador" => "sec0060" "titulo" => "Psychological symptoms" ] ] ] 9 => array:2 [ "identificador" => "sec0065" "titulo" => "Follow-up and clinical-therapeutic approach" ] 10 => array:2 [ "identificador" => "sec0070" "titulo" => "Conclusions" ] 11 => array:2 [ "identificador" => "sec0075" "titulo" => "Data availability" ] 12 => array:2 [ "identificador" => "sec0080" "titulo" => "Funding" ] 13 => array:2 [ "identificador" => "sec0085" "titulo" => "Conflicts of interest" ] 14 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2021-08-20" "fechaAceptado" => "2021-10-12" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec1499761" "palabras" => array:4 [ 0 => "Persistent COVID-19" 1 => "Post-acute COVID" 2 => "Long COVID" 3 => "COVID-19 sequels" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec1499760" "palabras" => array:4 [ 0 => "COVID-19 persistente" 1 => "COVID-19 posagudo" 2 => "COVID de larga duración" 3 => "Secuelas COVID-19" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">As the coronavirus-2019 disease (COVID-19) pandemic, caused by the infection with severe acute respiratory syndrome (SARS-CoV-2) coronavirus type 2, has progressed, persistent COVID-19 syndrome is an increasingly recognized problem on which a significant volume of medical literature is developing. Symptoms may be persistent or appear, after an asymptomatic period, weeks or months after the initial infection. The clinical picture is as markedly heterogeneous and multisystemic as in the acute phase, so multidisciplinary management is required. In addition, their appearance is not related to the severity of the initial infection, so they can affect both mild patients, even asymptomatic, and seriously ill patients who have required hospitalization. Although it can affect people of any age, it is more common in middle-aged women. The sequelae can generate a high impact on the quality of life, and in the work and social environment. The objective of this paper is to review persistent COVID-19 syndrome, to know its clinical manifestations and the strategies for the management and follow-up of these patients.</p></span>" ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">A medida que ha avanzado la pandemia de la enfermedad por coronavirus 2019 (COVID-19), originada por la infección por el coronavirus de tipo 2, causante del síndrome respiratorio agudo severo (SARS-CoV-2), el síndrome de COVID-19 persistente es un problema cada vez más reconocido y sobre el que se está desarrollando un importante volumen de publicaciones. Los síntomas pueden ser persistentes o aparecer, tras un periodo asintomático, semanas o meses después de la infección inicial. El cuadro clínico es tan marcadamente heterogéneo y multisistémico como en la fase aguda, por lo que se requiere un manejo multidisciplinar. Además, su aparición no está relacionada con la gravedad de la infección inicial, por lo que pueden afectar tanto a pacientes leves, incluso asintomáticos, como a enfermos graves que han requerido hospitalización. Aunque puede afectar a personas de cualquier edad, es más frecuente en mujeres de edad media. Las secuelas pueden generar un elevado impacto en la calidad de vida, y en el ámbito laboral y social. El objetivo de este trabajo es hacer una revisión sobre el síndrome de COVID-19 persistente, conocer sus manifestaciones clínicas y las estrategias para el manejo y seguimiento de estos pacientes.</p></span>" ] ] "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: López-Sampalo A, Bernal-López MR, Gómez-Huelgas R. Síndrome de COVID-19 persistente. Una revisión narrativa. Rev Clín Esp. 2022;222:241–250.</p>" ] ] "multimedia" => array:4 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1287 "Ancho" => 2500 "Tamanyo" => 228719 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Etiopathogenetic mechanisms of long COVID-19.</p>" ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1624 "Ancho" => 2917 "Tamanyo" => 501998 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Symptomatology of long COVID-19.</p>" ] ] 2 => array:8 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0015" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:2 [ "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">F: female; H: hospitalisation; M: male; NH: no hospitalisation.</p>" "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Authors \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Country \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Study type \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">n \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Mean age (years) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Sex \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Acute phase (H/NH) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Follow-up period \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Persistence of symptoms (%) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Symptoms \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Chopra et al.<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">USA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Observational cohort \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">488 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">62 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 51.8%F: 47.2% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">32.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Dyspnoea 23%; cough 15.3%; anosmia/ageusia 13.1%; chest pain 9.0%; inability to return to daily activities 32.4%; emotional impairment 38.5% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Carfi et al.<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Italy \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Longitudinal prospective \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">143 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">56.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 63%F: 37% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">87.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Fatigue 53.1%; dyspnoea 43.4%; joint pain 27.3%; chest pain 21.7% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Carvalho-Schneider et al.<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">France \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Longitudinal prospective \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">150 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">49 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 46%F: 54% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">66.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Asthenia 40%; dyspnoea 30%; anosmia/ageusia 23% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Huang et al.<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">China \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Ambispective cohort \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1,733 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">57 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 52%F: 48% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">76.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Fatigue/muscle weakness 63%; insomnia 26%; anxiety/depression 23%; alopecia 22%; anosmia 11%; palpitations 9%; arthralgia 9%; loss of appetite 8%; dysgeusia 7%; dizziness 6%; diarrhoea 5%; chest pain 5%, and headache 2% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Romero-Duarte et al.<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Spain \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Observational longitudinal \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">962 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">63 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 46.3%F: 53.7% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">63.9 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Dyspnoea 28%; fatigue 22.1%; anosmia 20.8%; musculoskeletal pain 15.3%; diarrhoea 10.3%; dysgeusia 7.2%; fever 7%; anxiety 6.8%; chest pain 6%; abdominal pain 5.3%; headache 5.3%; insomnia 4.9%; anxiety 4.4%; paraesthesia 3.4%; movement disorder 3.4%, y disorientation/confusion 2.6% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rodriguez-Ledo et al.<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Spain (online survey) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Observational cohort \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2,120 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">43.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 21%F: 79% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HNH \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">187 days \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">86.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Asthenia 83.6%; general discomfort 79.3%; headache 63%; myalgia 60.7%; low mood 56.6%; arthralgia 56.4%; dyspnoea 56.2%, and chest pain 54.7% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Augustin et al.<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Germany \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Longitudinal prospective \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">958 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">46 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 46.4%F: 53.6% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H: 2.9%NH: 97.1% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">27.8 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Anosmia 12.4%; dysgeusia 11.1%; fatigue 9.7%, and dyspnoea 8.6% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Peghin et al.<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Italy \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Ambispective cohort \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">559 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">53 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">M: 46.6%F: 53.4% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HNH \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6 months \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">40.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Fever 73.7%; anosmia/dysgeusia 60.3%; cough 47.9%, and fatigue 43.8% \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Goërtz et al.<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HollandBelgium \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Observational cohort \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2,113 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">47 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">– \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">H: 5.3%NH: 94.7% \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">79 days \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">93.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Fatigue 87%; dyspnoea 71%; chest pain 44%; headache 38%; muscle pain 36%; palpitations 32%, and cough 29% \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab2878307.png" ] ] ] ] "descripcion" => array:1 [ "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Principal studies of follow-up in patients with post-COVID-19 symptoms.</p>" ] ] 3 => array:8 [ "identificador" => "tbl0010" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0020" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Quality of life \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">SF-36 survey \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Dyspnoea \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Medical Research Council modified scale \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Pain \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Spanish Graded Chronic Pain Scale \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Fatigue \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Modified Fatigue Impact Scale \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Physical exercise \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Global Physical Activity Questionnaire \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Emotional disorders \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Hospital Anxiety and Depression Scale \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Sleep disorders \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Pittsburgh Sleep Quality Index \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Cognitive disorders \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Modification to the Memory Failures of Everyday Questionnaire \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab2878308.png" ] ] ] ] "descripcion" => array:1 [ "en" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Clinical scales shown to be most useful for evaluating long COVID-19 based on symptomatology.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:67 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Covid-19: what do we know about “long covid”?" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "E. Mahase" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1136/bmj.m2815" "Revista" => array:5 [ "tituloSerie" => "BMJ" "fecha" => "2020" "volumen" => "370" "paginaInicial" => "m2815" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/32665317" "web" => "Medline" ] ] ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0010" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "6-month consequences of COVID-19 in patients discharged from hospital: a cohort study" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:3 [ 0 => "C. Huang" 1 => "L. Huang" 2 => "Y. 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