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Table 5 Comparison of postoperative hypoxemia rates for the 2012 and 2015 patient cohorts

From: Evaluation of operating room reverse Trendelenburg positioning and its effect on postoperative hypoxemia, aspiration, and length of stay: a retrospective study of consecutive patients

  2012 2015 p value
Patients 500 1000  
Postoperative hypoxemia 128 (25.6%) 181 (18.1%) 0.0007
Preoperative risk
 Age 54 ± 17 57 ± 17 0.0021
 Age ≥ 75 years 62 (12.4%) 186 (18.6%) 0.0023
 ASA classification 2.8 ± 0.7 2.9 ± 0.6 0.0323
 ASA classification 3 or 4 359 (71.8%) 771 (77.1%) 0.0248
 Emergency procedures 36 (7.2%) 87 (8.7%) 0.3182
 Preexisting lung disease 69 (13.8%) 153 (15.3%) 0.4406
 Weight (kg) 86 ± 24 86 ± 24 0.9357
Intraoperative risk
 Operating room minutes 129 ± 77 128 ± 73 0.8031
 Glycopyrrolate on induction 119 (23.8%) 248 (24.8%) 0.6711
 Fluid input (L) 1.8 ± 1.2 1.5 ± 1.0 0.0001
  1. ASA American Society of Anesthesiologists