Impact of Baseline Systolic Blood Pressure on Long-Term Outcomes in Patients With Advanced Chronic Systolic Heart Failure (Insights from the BEST Trial)

Abstract

The impact of baseline systolic blood pressure (SBP) on outcomes in patients with advanced chronic systolic heart failure (HF) has not been studied using a propensity-matched design. Of the 2,706 participants in the Beta-Blocker Evaluation of Survival Trial (BEST) with chronic HF, New York Heart Association class III to IV symptoms and left ventricular ejection fraction < or =35%, 1,751 had SBP < or =120 mm Hg (median 108, range 70 to 120) and 955 had SBP >120 mm Hg (median 134, range 121 to 192). Propensity scores for SBP >120 mm Hg, calculated for each patient, were used to assemble a matched cohort of 545 pairs of patients with SBPs < or =120 and >120 mm Hg who were balanced in 65 baseline characteristics. Matched Cox regression models were used to estimate associations between SBP < or =120 mm Hg and outcomes over 4 years of follow-up. Matched participants had a mean age +/- SD of 62 +/- 12 years, 24% were women, and 24% were African-American. HF hospitalization occurred in 38% and 32% of patients with SBPs < or =120 and >120 mm Hg, respectively (hazard ratio 1.33 SBP < or =120 was compared to >120 mm Hg, 95% confidence interval 1.04 to 1.69, p = 0.023). All-cause mortality occurred in 28% and 30% of matched patients with SBPs < or =120 and >120 mm Hg, respectively (hazard ratio 1.13 SBP < or =120 compared to >120 mm Hg, 95% confidence interval 0.86 to 1.49, p = 0.369). In conclusion, in patients with advanced chronic systolic HF, baseline SBP < or =120 mm Hg is associated with increased risk of HF hospitalization, but had no association with all-cause mortality.