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Table 3 Postoperative hypoxemia (POH) associations

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

  POH (No) POH (Yes) p value
Patients 1191 (79.4%) 309 (20.6%)  
Adverse outcomes
 Mortality 2 (0.2%) 7 (2.3%) 0.0004
 Postoperative length of stay (days) 2.0 ± 2.6 4.6 ± 4.8 < 0.0001
Preoperative risk
 Age 55 ± 18 63 ± 15 < 0.0001
 ASA classification 2.8 ± 0.6 3.1 ± 0.5 < 0.0001
 ASA classification 3 or 4 857 (72.0%) 273 (88.4%) < 0.0001
 Emergency procedures 88 (7.4%) 35 (11.3%) 0.0246
 Preexisting lung disease 160 (13.4%) 62 (20.1%) 0.0034
 Weight (kg) 86 ± 24 89 ± 23 0.0489
Intraoperative risk
 Operating room minutes 122 ± 68 154 ± 90 < 0.0001
 Glycopyrrolate on induction 303 (25.4%) 64 (20.7%) 0.0849
 Fluid input (L) 1.5 ± 0.9 2.0 ± 1.5 < 0.0001
  1. ASA American Society of Anesthesiologists