Admission Systolic Blood Pressure and Outcomes After Endovascular Thrombectomy

BACKGROUND AND OBJECTIVES: Current international guidelines recommend blood pressure (BP) thresholds for patients eligible for endovascular thrombectomy (EVT). Previous studies have suggested that both low and high admission BPs are associated with poor functional outcome after EVT. However, the association between admission BP and outcomes after EVT remains poorly understood.The aim of this study was to investigate the relationship between admission systolic BP (SBP) and outcomes in patients treated with EVT and to assess whether this association is modified by IV thrombolysis (IVT) treatment and recanalization status. METHODS: In this observational, international, multicenter cohort study, we used data from the EVA-TRISP registry. Consecutive patients treated with EVT with available admission SBP were included. The primary outcome was 90-day functional outcome. Secondary outcomes included 90-day mortality, 24-hour NIH Stroke Scale (NIHSS), successful recanalization, and symptomatic intracranial hemorrhage (sICH). We used multivariable regression to study the relation between admission SBP and outcomes and to assess effect modification by IVT treatment and recanalization status. RESULTS: We included 10.963 EVT patients. At baseline, the mean age was 72.8 years (SD 13.5), 50.2% were female and the median NIHSS at presentation was 15 (interquartile range 9-19). The association between admission SBP and functional outcome, mortality, and 24-hour NIHSS score was U-shaped, and the nadir was around 150 mm Hg. Below 150 mm Hg, every 10 mm Hg decrease in SBP was associated with higher odds of poor functional outcome (adjusted odds ratio (aOR) 1.07 [95% CI 1.02-1.11]) and mortality (aOR 1.17 [1.12-1.23]). Above 150 mm Hg, every 10 mm Hg increase in SBP was associated with higher odds of poor functional outcome (aOR 1.05 [1.01-1.08]), mortality (aOR 1.04 [1.01-1.09]), and higher 24-hour NIHSS score (β-coefficient 0.28 [0.17-0.40]). We found a positive linear relationship between admission SBP and sICH (1.04 [1.01-1.08]). IVT treatment modified the association between admission SBP and outcomes after EVT. In 5544 EVT-only treated patients, there was no longer a clear association between higher admission SBP values and worse outcome. DISCISSION: Lower and higher admission SBP was associated with worse outcomes in the complete cohort. In EVT-only patients, this association was less evident, suggesting that high admission BP alone should not always delay or preclude treatment with EVT in otherwise eligible patients.