The Relationship Between Admission Systolic Blood Pressure and Mortality in Telestroke Patients.

Abstract

Background: A U-shaped relationship between admission blood pressure (BP) and mortality (wherein patients within a middle range have better outcomes than patients at higher or lower extremes) in patients receiving intravenous recombinant tissue-plasminogen activator (tPA) has been previously described. We aim to determine if this U-shaped relationship persists for patients in a telestroke setting regardless of tPA administration. Materials and Methods: We conducted a retrospective chart review of the prospectively collected registry data for all patients seen through the Medical University of South Carolina (MUSC) telestroke network. Admission systolic BP (SBP) was divided into quartiles with thresholds based on the 25th, 50th, and 75th percentiles as cut points separately by tPA status. The primary outcomes of this study were odds of 90-day modified Rankin scale ≤2 and 90-day mortality. Logistic regression analyses were used to analyze associations between BP quartiles and these outcomes, adjusted for relevant clinical covariates. Results: Our sample comprised 1,232 patients evaluated for telestroke, 616 of whom received tPA. Patients in the second (odds ratio [OR] 0.34, 95% confidence interval [CI] 0.15-0.77 in the tPA group, OR 0.27, 95% CI 01.0-0.78 in the non-tPA group) and third (OR 0.26, 95% CI 0.11-0.64 in the tPA group, OR 0.36, 95% CI 0.14-0.92 in the non-tPA group) quartiles of admission SBP had lower adjusted odds of 90-day mortality. Conclusions: Our findings support a U-shaped relationship between admission SBP and 90-day mortality in acute stroke patients regardless of tPA administration, after adjustment for relevant covariates. Further research into interventions regarding BP management poststroke is warranted.