Intensive blood pressure lowering after endovascular thrombectomy in acute ischaemic stroke: an updated systematic review and meta-analysis of randomized controlled trials

Abstract Background Endovascular thrombectomy is an effective treatment in those with acute ischemic stroke. However, following successful reperfusion there are still many uncertainties as to the factors which influence patient outcome. Effective blood pressure management in this cohort has been elicited as one of these factors, with worse outcomes seen at both the high and low extremes. Purpose Pinpointing an optimal systolic blood pressure target after this procedure is still uncertain. We aimed to perform an updated meta-analysis of randomised controlled trials (RCTs) to evaluate the safety and efficacy of intensive blood pressure management as compared to conventional blood pressure management in this patient population. Methods We searched various electronic databases, including Embase, MEDLINE (via PubMed), and CENTRAL, to retrieve relevant RCTs evaluating a strategy of intensive blood pressure management after endovascular thrombectomy compared to conventional management. We pooled risk ratio (RR) with 95% confidence intervals (CI) for dichotomous outcomes and mean difference (MD) with 95% CI for continuous outcomes, using RevMan 5.4. Results The meta-analysis included 4 RCTs with a total of 1560 patients. According to the analysis, intensive blood pressure management was associated with a statistically significant decrease in the number of patients showing functional independence (modified Rankin scale mRS score=0-2) at 90 days (RR 0.81; CI = 0.72-0.91; I2 = 12%). Regarding 90-day mortality, the pooled results from three RCTs showed no statistically significant difference between the intensive blood pressure management group and the conventional blood pressure management group (RR 1.17; CI = 0.90-1.52; I2 = 0%). There was no statistically significant difference between the two groups regarding the incidence of intracerebral haemorrhage (ICH) (RR 1.05; CI = 0.90-1.23; I2 = 0%) and the incidence of symptomatic intracerebral haemorrhage (sICH) (RR 1.10; CI = 0.76-1.60; I2 = 0%). Conclusion The meta-analysis showed no benefit of intensive lowering of blood pressure in terms of functional independence at 90 days, mortality rates, and incidence of ICH. Future large-scale trials should focus on other interventions to improve prognosis in these patients.Figure 1Figure 2