Sex Differences in Cardiovascular Outcomes in Patients With Kidney Failure

Abstract

Background Cardiovascular disease is the leading cause of mortality in patients with kidney failure, and their risk of cardiovascular events is 10 to 20 times higher as compared with the general population. Methods and Results We evaluated 508 822 patients who initiated dialysis between January 1, 2005 and December 31, 2014 using the United States Renal Data System with linked Medicare claims. We determined hospitalization rates for cardiovascular events, defined by acute coronary syndrome, heart failure, and stroke. We examined the association of sex with outcome of cardiovascular events, cardiovascular death, and all‐cause death using adjusted time‐to‐event models. The mean age was 70±12 years and 44.7% were women. The cardiovascular event rate was 232 per thousand person‐years (95% CI, 231–233), with a higher rate in women than in men (248 per thousand person‐years [95% CI, 247–250] versus 219 per thousand person‐years [95% CI, 217–220]). Women had a 14% higher risk of cardiovascular events than men (hazard ratio [HR], 1.14 [95% CI, 1.13–1.16]). Women had a 16% higher risk of heart failure (HR, 1.16 [95% CI, 1.15–1.18]), a 31% higher risk of stroke (HR, 1.31 [95% CI, 1.28–1.34]), and no difference in risk of acute coronary syndrome (HR, 1.01 [95% CI, 0.99–1.03]). Women had a lower risk of cardiovascular death (HR, 0.89 [95% CI, 0.88–0.90]) and a lower risk of all‐cause death than men (HR, 0.96 [95% CI, 0.95–0.97]). Conclusions Among patients undergoing dialysis, women have a higher risk of cardiovascular events of heart failure and stroke than men. Women have a lower adjusted risk of cardiovascular mortality and all‐cause mortality.