Erschienen in:
18.08.2021 | Reports of Original Investigations
The association of nitrous oxide on length of stay in the postanesthesia care unit: a retrospective observational study
verfasst von:
Salameh Sameh Obeidat, MD, Karuna Wongtangman, MD, Michael Blank, cand med, Luca J. Wachtendorf, cand med, Maximilian Hammer, cand med, Maximilian S. Schaefer, MD, Peter Santer, MD, PhD, Matthias Eikermann, MD, PhD, Eswar Sundar, MD
Erschienen in:
Canadian Journal of Anesthesia/Journal canadien d'anesthésie
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Ausgabe 11/2021
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Abstract
Purpose
To assess whether intraoperative use of nitrous oxide (N2O) as an adjunct to general anesthesia is associated with a shorter length of stay in the postanesthesia care unit (PACU).
Methods
We analyzed data from adult patients who underwent non-cardiothoracic surgery under general anesthesia between May 2008 and December 2018. We assessed the association between intraoperative low- and high-dose N2O and PACU length of stay.
Results
A total of 148,284 patients were included in the primary analysis. After adjusting for a priori defined confounders, a high dose of N2O significantly decreased PACU length of stay, with a calculated difference of −9.1 min (95% confidence interval [CI], −10.5 to −7.7; P < 0.001). Patients who received high-dose N2O had a lower incidence of both short- and prolonged-duration of intraoperative hypotension (adjusted odds ratio [aOR], 0.85; 95% CI, 0.83 to 0.88; P < 0.001 and aOR, 0.76; 95% CI, 0.73 to 0.80; P < 0.001, respectively) and received a lower total intraoperative vasopressor dose (−0.04 mg of norepinephrine equivalents; 95% CI, −0.06 to −0.01; P = 0.01). The effect of high-dose N2O on PACU length of stay was modified by surgical complexity (adjusted absolute difference: −26.1 min; 95% CI, −29.2 to −23.1; P < 0.001; P for interaction < 0.001), and most pronounced in patients who underwent complex surgery and received intraoperative antiemetic therapy (adjusted absolute difference: −38.9 min; 95% CI, −43.1 to −34.6; P < 0.001; P for interaction < 0.001).
Conclusions
Nitrous oxide was dose-dependently associated with a decreased PACU length of stay. The effect was clinically relevant (> 30 min difference) in patients who underwent complex surgical procedures and received intraoperative antiemetic therapy.