The impact of left ventricular ejection fraction on heart failure patients with pulmonary hypertension

Abstract

Background: The most common cause of pulmonary hypertension (PH) in developed countries is left heart disease (LHD, group 2 PH). The development of PH in heart failure (HF) patients is indicative of worse outcomes.

Objective: The aim of this study was to evaluate the long term outcomes of HF patients with PH in a national long-term registry.

Methods: Study included 9 cardiology centers across Israel between 01/2013-01/2015, with a 12-month clinical follow-up and 24-month mortality follow-up. Patients were age ≥18 years old with HF and pre-inclusion PH due to left heart disease determined by echocardiography [estimated systolic pulmonary arterial pressure (SPAP) ≥ 50 mmHg]. Patients were categorized into 3 groups: HF with reduced (HFrEF < 40%), mid-range (HFmrEF 40-49%), and preserved (HFpEF ≥ 50%) ejection fraction.

Results: The registry included 372 patients, with high prevalence of cardiovascular risk factors. Median HF duration was 4 years and 65% were in severe HF New York Heart Association (NYHA) classification ≥3. Mean systolic pulmonary artery pressure (SPAP) was 62 ± 11 mmHg. During 2-years of follow-up, 54 patients (15%) died. Univariable predictors of mortality included NYHA grade 3-4, chronic renal failure, and SPAP ≥ 65 mmHg. Severe PH was associated with mortality in HFpEF, but not HFmrEF or HFrEF, and remained significant after multivariable adjustment with an adjusted hazard ratio of 2.99, (95%CI 1.29-6.91, p = 0.010).

Conclusions: The combination of HFpEF with severe PH was independently associated with increased mortality. Currently, HFpEF patients are included with group 2 PH patients. Defining HFpEF with severe PH as a sub-class may be more appropriate, as these patients are at increased risk and deserve special consideration.

Keywords: Heart failure; Mortality; Pulmonary hypertension.