Cardiovascular Outcomes in Patients on Home Hemodialysis and Peritoneal Dialysis

Background Cardiovascular disease is the leading cause of morbidity and mortality in patients with ESKD. Little is known about differences in cardiovascular outcomes between home hemodialysis (HHD) and peritoneal dialysis (PD). Methods We evaluated 68,645 patients who initiated home dialysis between January 1, 2005, and December 31, 2018, using the United States Renal Data System with linked Medicare claims. Rates for incident cardiovascular events of acute coronary syndrome, heart failure, and stroke hospitalizations were determined. Using adjusted time-to-event models, the associations of type of home dialysis modality with the outcomes of incident cardiovascular events, cardiovascular death, and all-cause death were examined. Results Mean age of patients in the study cohort was 64 +/- 15 years, and 42.3% were women. The mean time of follow-up was 1.8 +/- 1.6 years. The unadjusted cardiovascular event rate was 95.1 per thousand person-years (PTPY) (95% confidence interval [CI], 93.6 to 96.8), with a higher rate in patients on HHD than on PD (127.8 PTPY; 95% CI, 118.9 to 137.2 versus 93.3 PTPY; 95% CI, 91.5 to 95.1). However, HHD was associated with a slightly lower adjusted risk of cardiovascular events than PD (hazard ratio [HR], 0.92; 95% CI, 0.85 to 0.997). Compared with patients on PD, patients on HHD had 42% lower adjusted risk of stroke (HR, 0.58; 95% CI, 0.48 to 0.71), 17% lower adjusted risk of acute coronary syndrome (HR, 0.83; 95% CI, 0.72 to 0.95), and no difference in risk of heart failure (HR, 1.05; 95% CI, 0.94 to 1.16). HHD was associated with 22% lower adjusted risk of cardiovascular death (HR, 0.78; 95% CI, 0.71 to 0.86) and 8% lower adjusted risk of all-cause death (HR, 0.92; 95% CI, 0.87 to 0.97) as compared with PD. Conclusions Relative to PD, HHD is associated with decreased risk of stroke, acute coronary syndrome, cardiovascular death, and all-cause death. Further studies are needed to better understand the factors associated with differences in cardiovascular outcomes by type of home dialysis modality in patients with kidney failure.