White Matter Hyperintensity, Immediate Antihypertensive Treatment, and Functional Outcome After Acute Ischemic Stroke.

Background and Purpose- It remains unknown that whether white matter hyperintensity (WMH) severity influences the effect of antihypertensive treatment in acute ischemic stroke. We aimed to investigate the effects of early antihypertensive treatment on death and disability among patients with acute ischemic stroke according to WMH severities. Methods- This study was a secondary analysis of the data from CATIS (China Antihypertensive Trial in Acute Ischemic Stroke). Severity of WMH was evaluated using Fazekas rating scale score among 303 participants with available magnetic resonance imaging data and was categorized into none-mild WMH (Fazekas score 0-2) and moderate-severe WMH (Fazekas score 3-6). Functional outcome was death or major disability (modified Rankin Scale score of ≥3) at 14 days or hospital discharge and within 3 months. Results- WMH severity was significantly associated with an increased risk of death or major disability. Each 1 score increase in Fazekas score was associated with an adjusted odds ratio (95% CI) of 1.25 (1.03-1.51) for 14 days or hospital discharge and 1.39 (1.12-1.72) for 3-month functional outcome. There were no significant interactions between antihypertensive treatment and WMH severity (both P>0.1) on functional outcome at 14 days or hospital discharge and within 3 months. The neutral effects of immediate antihypertensive treatment were observed both in patients with moderate-severe WMH and none-mild WMH. Conclusions- Participants with higher WMH burden had increased risk of death or major disability after acute ischemic stroke. Early antihypertensive treatment had a neutral effect on clinical outcomes among acute ischemic stroke patients with a variety of WMH severities. Registration- URL: https://www.clinicaltrials.gov; Unique identifier: NCT01840072.