Purpose. Acoustic respiratory rate (RRa) monitoring provides an accurate estimation of the respiratory rate (RR).We investigated\nthe incidence of oxygen desaturation under RRa monitoring in a postoperative setting and identified its related factors. Methods.\nThis study was a retrospective chart review of postoperative patients outside an intensive care unit setting. Using the data collected\nduring the first 8 h postoperatively, patients were divided into oxygen desaturated (SpO2 < 90% for >10 s) and nondesaturated\ngroups under oxygen administration. Multivariate analysis was used to determine oxygen desaturation-associated explanatory\nfactors. Results. Oxygen desaturation was detected in 102 of 935 patients (10.9%). % vital capacity [odds ratio (OR), 0.885 per 10%\nincrease; 95% confidence interval (CI), 0.790 to 0.992], coexisting chronic obstructive pulmonary disease (OR, 2.195; 95% CI, 1.088\nto 4.428), and absence of a critical RRa change (RR > 30 or <8 beats/min for >2 min) (OR, 1.972; 95% CI, 1.226 to 3.172) were\nindependently associated with oxygen desaturation. Conclusion. Postoperative oxygen desaturation was observed in more than\n10% of the patients whose RR was monitored by RRa under oxygen therapy. It is more likely to occur in patients with impaired\npulmonary function or morbid pulmonary status and can also occur in the absence of abnormal RR.
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