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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">The differentiation of patients with HF based on LVEF echocardiographic values is important due mainly to the fact that it helps establish 2 subtypes&#58; HF with reduced LVEF &#40;&#60;40&#37;&#41; &#40;HFrEF&#41; and HF with preserved LVEF &#40;&#8805;50&#37;&#41; &#40;HFpEF&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">1</span></a> The 2 conditions are differentiated in terms of demographic characteristics&#44; etiological factors&#44; associated comorbidities and treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">1</span></a> Patients with HFrEF are younger and have fewer comorbidities&#44; and their fundamental etiology is ischemic heart disease&#46; Historically&#44; most studies designed to treat HF have focused on patients with HFrEF&#44; with most clinical trials excluding those patients with HFpEF&#46; Therefore&#44; most of the therapeutic evidence &#40;both pharmaceutical and nonpharmaceutical&#41; has been generated from patients with a LVEF typically &#60;35&#8211;40&#37;&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">2&#44;3</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Recently&#44; the European Society of Cardiology has established a new category in the classification of HF based on LVEF&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">3</span></a> This new category is known as HF with mid-range EF &#40;HFmEF&#41; and encompasses all patients with LVEF between 40&#37; and 49&#37;&#44; which until now constituted an undefined &#8220;gray area&#8221;&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">4</span></a> As with HFpEF&#44; the evidence on its treatment is highly limited&#46; Although this new category currently represents no more than 10&#37;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">5</span></a> the improvements in treating ischemic heart disease will increasingly lead to more patients with ischemia presenting less myocardial damage&#44; increasing the percentage of those with HFmEF&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">4</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The patterns of the various types of HF have varying characteristics&#46; Thus&#44; patients with HFrEF have primary and symptomatic heart disease as the leading cause of their HF&#44; while those with HFpEF have multiorgan disease in which various phases occur&#44; symptomatic or not&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">3</span></a> Therefore&#44; when establishing whether there are similarities between HFmEF and HFpEF&#44; we need other data &#40;in addition to LVEF&#41; such as natriuretic peptide levels&#44; renal function and comorbidity data that help us make comparisons&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">A study performed on 1663 patients with HF &#40;of hypertensive&#44; ischemic or idiopathic origin&#41; assessed the presence of left ventricular dysfunction in each of the 3 HF categories &#40;based on their LVEF&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">6</span></a> Sixty-seven percent of the patients had HFrEF&#44; 23&#37; had HFpEF&#44; and the remaining 10&#37; had HFmEF&#46; In terms of the differential characteristics between the various types of HF&#44; the study observed that the patients with HFmEF had a systolic and diastolic blood pressure and a prevalence of atrial fibrillation similar to those with preserved LVEF&#46; Compared with the HFrEF group&#44; the patients with HFpEF and HFmEF had a lower percentage of cases in functional classes III and IV&#44; lower serum BNP concentrations&#44; lower right ventricular dysfunction &#40;defined as tricuspid annular plane systolic excursion &#91;TAPSE&#93; &#60;14&#37;&#41; and a lower percentage of patients with systolic pulmonary artery pressure &#62;40<span class="elsevierStyleHsp" style=""></span>mm<span class="elsevierStyleHsp" style=""></span>Hg&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">6</span></a> Unlike the HFpEF group&#44; the patients with HFmEF had more ischemic heart disease&#59; were more frequently treated with angiotensin-converting enzyme inhibitors&#44; angiotensin II receptor antagonists&#44; beta-blockers and spironolactone and had a greater rate of device implantation&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">6</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">In another recent study&#44; Kapoor et al&#46; analyzed a total of 99&#44;825 patients with HF who were hospitalized in 305 centers in the United States from 2005 to 2013&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">7</span></a> Forty-nine percent of the patients were classified as HFrEF&#44; 13&#37; as HFmEF and 38&#37; as HFpEF&#46; The patients with HFmEF had a similar age&#44; sex and comorbidities to those of patients with HFpEF &#40;older&#44; percentage of women and number of comorbidities&#41;&#46; However&#44; the HFmEF group had ischemic heart disease as the fundamental cause&#44; similar to the HFrEF group&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Another aspect to consider is that patients with HFmEF do not constitute a homogeneous group because&#44; depending on the pathophysiological mechanism&#44; the LVEF can be the result of the recovery of previously reduced systolic function or the result of a systolic function impairment that achieves mid-range LVEF readings&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">8</span></a> A recent study observed that patients with recovered HFmEF had fewer cardiovascular events&#44; as did those who had HFpEF&#46; Nevertheless&#44; this patient group with recovered HFmEF showed biological&#44; epidemiological and echocardiographic characteristics different from those of the other HFpEF and HFrEF groups and could therefore constitute a type with its own identity&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">8</span></a> Nevertheless&#44; 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PROS AND CONS
Is heart failure with midrange ejection fraction similar to preserved ejection fraction? In favor
La insuficiencia cardiaca con fracción de eyección en rango intermedio ¿es similar a la de fracción de eyección preservada? A favor
M. Camafort Babkowski
Servicio de Medicina Interna General, ICMiD Hospital Clínic-IDIBAPS, Universidad de Barcelona, Barcelona, Spain

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