Systolic BP Variability and Risk of Ischemic Stroke in Patients Receiving Hemodialysis

Higher visit-to-visit BP variability was independently associated with increased ischemic stroke risk in hemodialysis patients. BP variability from routine dialysis records may help identify hemodialysis patients at high risk of ischemic stroke.

BP variability (BPV) has been recognized as a cardiovascular risk factor beyond mean BP, but its role in ischemic stroke among patients receiving hemodialysis remains incompletely defined, particularly across stroke subtypes. We evaluated the association between visit-to-visit BPV and incident ischemic stroke in a multicenter hemodialysis cohort.

In this prospective cohort study, 1136 patients undergoing maintenance hemodialysis were enrolled from 12 centers. Predialysis BP measurements were collected over a standardized 12-week baseline period (approximately 36 readings per patient). BPV was quantified using the coefficient of variation (CV) and analyzed per 10% greater CV and by tertiles. The primary outcome was incident ischemic stroke, including large artery atherosclerosis (LAA) and small vessel occlusion. Fine-Gray competing risk models were used to estimate subdistribution hazard ratios, adjusting for demographics, BP, comorbidities, medication, and dialysis-related factors.

During a median follow-up of 54 months, 144 patients developed ischemic stroke. Higher systolic BPV was independently associated with greater stroke risk (subdistribution hazard ratio per 10% greater CV, 1.74; 95% confidence interval, 1.10 to 2.76; P = 0.02) in the clinically adjusted model, with consistent findings in extended analyses. In subtype-specific analyses, systolic BPV was significantly associated with LAA and showed a directionally consistent, but attenuated association with small vessel occlusion after extended adjustment. By contrast, diastolic BPV showed weaker associations that were not statistically significant after multivariable adjustment.

Higher systolic BPV was independently associated with ischemic stroke in patients receiving hemodialysis, with the most consistent subtype-specific association observed for LAA. These findings suggest that systolic BPV may serve as a clinically accessible marker of cerebrovascular risk beyond mean BP in this high-risk population.