Differential prognostic effect of systolic blood pressure on mortality according to left-ventricular function in patients with acute heart failure

Abstract

Aims: To evaluate the relationship between systolic blood pressure (SBP) and long-term mortality in patients with acute heart failure (AHF) stratified by ejection fraction (LVEF): reduced (≤40) vs. preserved (≥50).Methods and resultsWe studied 1049 consecutive patients admitted with AHF. Systolic blood pressure was determined in the emergency department. Left-ventricular ejection fraction was categorized as ≤40 (n = 288), 41-49 (n = 174), or ≥50 (n = 587). Cox regression analysis was used for multivariable analysis. Mean age and SBP were 73 ± 11 years and 150 ± 36 mmHg, respectively. During a median follow-up of 18 months, 290 deaths (33.1) were identified. Higher SBP was associated with lower mortality. In multivariable analysis, a differential effect of SBP across LVEF status was documented (P-value for interaction = 0.036). In linear models, SBP was shown to be inversely related with mortality in both groups (per 10 mmHg decrease): HR(LVEF ≥ 50): 1.06, CI 95 = 1.01-1.11; P = 0.016, and HR(LVEF ≤ 40): 1.16, 95 CI = 1.08-1.25; P < 0.001). When SBP was modelled with restrictive cubic splines, an inverse and almost linear relationship with mortality was shown in patients with LVEF ≤40 (P < 0.001), whereas in patients with LVEF ≥50, SBP followed a J-shape curve.ConclusionIn patients with AHF, SBP showed a differential prognostic effect on mortality according to LVEF status; when LVEF was ≤40, SBP was linearly and inversely associated with mortality. Conversely, in patients with LVEF ≥50 this relationship showed a J-shape pattern.