Blood pressure excursion on admission and intravenous thrombolysis in ischemic stroke

Abstract

Background: Blood pressure (BP) excursion on admission was common in patients with acute ischemic stroke, but its influence on thrombolysis effect was not fully evaluated. Methods: Patients with acute ischemic stroke who received thrombolysis without subsequent thrombectomy were included. Admission BP excursion was defined as higher than 185/110 mmHg. Multivariate logistic regression analysis was used to evaluate the relationship between admission BP excursion and poor outcome as well as hemorrhage rates and mortality. Poor outcome was defined as a 90-day modified Rankin Scale score 3–6. Subgroup analysis was performed according to stroke severity, which was assessed by the National Institutes of Health Stroke Scale (NIHSS) score, and hypertension status. Results: A total of 633 patients were enrolled and 240 participants (37.9%) had admission BP excursion. Admission BP excursion was associated with poor outcome [adjusted odds ratio (OR) 0.64, 95% confidence interval 0.42–0.99, P = 0.046]. No significant difference was found regarding hemorrhage rates or mortality between patients with and without admission BP excursion. In subgroup analysis, admission BP excursion was related to poor outcome in patients with NIHSS score at least 7 (adjusted OR 1.89, 95% confidence interval 1.03–3.45, P = 0.038), but not in patients with NIHSS score less than 7 (P for interaction <0.001). Conclusion: Admission BP excursion above the guideline thresholds did not increase postthrombolysis hemorrhage risk or mortality, but was associated with poor outcome, especially in patients with severe stroke.