Preoperative Caval-Aortic Index and Pleth Variability Index for Predicting Post-Induction Hypotension in Colorectal Surgery

This prospective observational study evaluated whether the preoperative caval-aortic index and pleth variability index can predict post-induction hypotension in adult patients undergoing elective colorectal surgery under general anesthesia. Preoperative caval-aortic index and pleth variability index values were recorded before anesthesia induction. Blood pressure was measured before induction and at 1, 3, 5, 7, and 10 minutes after induction. Post-induction hypotension was defined as a decrease in systolic blood pressure of more than 30% from baseline and/or a mean arterial pressure below 60 mmHg. The predictive performance of the preoperative caval-aortic index and pleth variability index for post-induction hypotension was assessed.