Machine Learning Modeling of Intraoperative Hemodynamic Predictors of Postoperative Outcomes

"Systolic Blood Pressure (SBP)~1. Maximum change from preoperative SBP, in a) absolute change (mmHg), and b) relative change (%)(emergency and elective cases analyzed separately)~2. Cumulative duration (minutes) \>=20% below preoperative SBP~3. Longest single episode (minutes) below a) 80, b) 90, and c)100 mmHg~4. Cumulative duration (minutes) below a) 80, b) 90, and c)100 mmHg~Mean Arterial Pressure (MAP)~1. Maximum change from preoperative MAP, in a) absolute change (mmHg), and b) relative change (%) (emergency and elective cases analyzed separately)~2. Cumulative duration (minutes) \>=20% below preoperative MAP~3. Longest single episode (minutes) below a) 60, b) 65, c) 70, and d) 80mmHg~4. Cumulative duration (minutes) below a) 60, b) 65, c) 70, and d) 80mmHg"

"1. Maximum change (beats per minute, BPM) from preoperative heart rate (positive and negative)~2. Relative change (%) from preoperative heart rate (positive and negative)~3. Maximum pulse variation (maximum heart rate minus minimum heart rate)~4. Longest single episode (minutes) a) below 60, and b) above 100BPM~5. Cumulative duration (minutes) a) below 60, and b) above 100BPM"

"1. Vasopressor/inotrope use (yes vs. no): phenylephrine, norepinephrine, epinephrine, vasopressin, dobutamine, or milrinone~2. Infusion of any vasopressor/inotropes above (yes vs. no) (identified by unit of weight over time)~3. Phenylephrine/ephedrine bolus (yes vs. no) (identified by unit of weight only)~4. Vasodilator use (yes vs. no): labetalol, esmolol, nitroglycerin, nitroprusside~5. Infusion of any vasodilator above (yes vs. no) (identified by unit of weight over time)"

"1. Longest single episode (minutes) below a) 88, and b) 90%~2. Cumulative duration (minutes) below a) 88, and b) 90%"

"1. Longest single episode (minutes) a) below 30, and b) above 45mmHg~2. Cumulative duration (minutes) a) below 30, and b) above 45mmHg"