Effect of warfarin on survival in patients with concomitant left ventricular systolic dysfunction and pulmonary hypertension: a population cohort study

BackgroundThe use of oral anticoagulation in patients with heart failure in sinus rhythm remains controversial as previous large randomized controlled trials (RCTs) have not shown a survival benefit. However, heterogeneity exists among heart failure patients and it is possible that high-risk subgroups may benefit from anticoagulation (warfarin). We hypothesize that one such subgroup are patients with heart failure and pulmonary hypertension (PH), conditions associated with coagulation abnormalities. MethodsWe conducted a retrospective, population-based, longitudinal cohort study in patients with left ventricular systolic dysfunction (LVSD) and PH [defined as a right ventricular systolic pressure (RVSP) >35mmHg] identified from echocardiograms performed between January 1994 to May 2011. This data was linked using a unique patient-specific identifier to community-dispensed prescriptions, hospital admissions, and mortality data. For comparison, we included patients with LVSD and no PH. ResultsA total of 2619 subjects with LVSD and a measurable RVSP were identified (meanSD age of 73 +/- 12years); 1606 out of 2619 had PH and 1013 out of 2619 had no PH. The overall mean follow-up period was 2.56 +/- 3.0years. In patients with LVSD and PH, the use of warfarin was associated with an improved survival [hazard ratio (HR)=0.72 95% confidence interval (CI) 0.58-0.90, P=0.0003], fewer non-cardiovascular disease-related deaths (HR=0.65, 95%CI 0.49-0.87, P=0.0033 and showed a trend towards reduced cardiovascular disease-associated mortality (HR=0.72, 95%CI 0.51-1.02). Warfarin did not improve survival in those with LVSD with no PH. ConclusionsIn patients with both LVSD and PH, the use of warfarin is associated with a 28% reduction in mortality. Further prospective trials are required to confirm our findings.