Effect of the intraoperative use of the Hypotension Prediction Index on postoperative hypotension in the postanaesthesia care unit. Comment on Br J Anaesth 2021; 127: 681–8

Editor—We read with great interest the recent publication by Schenk and colleagues,1 which focused on the effect of two intraoperative haemodynamic management methods on the depth and duration of postoperative hypotension in the postanaestehsia care unit (PACU). The Hypotension Prediction Index (HPI) was developed by machine learning methods and allows clinicians to determine the possibility of upcoming hypotensive events with high accuracy.2 They compared HPI-guided and standard intraoperative haemodynamic management methods and found that HPI-guided haemodynamic care during surgery did not reduce the time-weighted average (TWA) of postoperative hypotension.