Effects of hyperacute blood pressure and heart rate on stroke outcomes after intravenous tissue plasminogen activator


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Abstract

Background and purposeThe present study clarifies associations between stroke outcomes after intravenous tissue plasminogen activator (tPA) and blood pressure (BP) as well as heart rate (HR) profiles.MethodsWe assessed 125 patients with stroke who received tPA within 3 h of onset. We obtained baseline, mean, maximum, minimum, and coefficient of variation values for BP and HR during the initial 24 h. The primary outcome was independence at 3 months corresponding to a modified Rankin Scale score of 2 or less. The secondary outcomes were early neurological improvement at 24 h and intracerebral hemorrhage (ICH) within 36 h.ResultsAmong the patients, 64 (51%) achieved independence, 66 (53%) early improvement, and 26 (21%) developed ICH. The 24-h time courses of SBP (P = 0.033), pulse pressure (PP, P = 0.007), and HR (P < 0.001) were lower among patients who reached independence than among those who did not. After multivariate adjustment, 24-h mean levels of SBP (odds ratio 0.69, 95% confidence interval 0.48–0.97, per 10-mmHg increase), PP (0.63, 0.41–0.94), and HR (0.59, 0.42–0.80, per 10-bpm increase) were inversely associated with independence, as were their maximum and minimum values. In particular, mean SBP values were inversely associated with independence at 8–16 and 16–24 h (0.73, 0.54–0.97 and 0.66, 0.47–0.91, respectively), but not at 0–8 h (0.79, 0.57–1.07). Baseline and maximum SBP were inversely associated with early improvement. Maximum and coefficient of variation of SBP were associated with ICH.ConclusionLower SBP, PP, and HR values during the initial 24 h after tPA, especially at 8 h thereafter, were associated with independence at 3 months.

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