Postoperative delirium is a common complication after surgical procedures with adverse consequences. A meta-analysis of 30 studies (18 eligible for quantitative analysis) investigated the association between intraoperative hypotension and postoperative delirium in adult patients. The results showed that intraoperative hypotension was significantly associated with an increased risk of postoperative delirium in both randomized controlled trials (hazard ratio 1.89) and observational studies (odds ratio 2.48). Hypotension defined by absolute arterial pressure threshold or mean arterial pressure (MAP) was associated with an even higher risk (odds ratio 4.11 and 2.90). However, methodological heterogeneity between studies limits the reliability of these findings. The authors conclude that current evidence suggests an association between intraoperative hypotension and postoperative delirium, but emphasize the need for more standardized future research in this area.