Effects of high versus low inspiratory oxygen fraction on postoperative clinical outcomes in patients undergoing surgery under general anesthesia: A systematic review and meta-analysis of randomized controlled trials
- Authors
- Lim, Choon-Hak; Han, Ju-young; Cha, Seung-ha; Kim, Yun-Hee; Yoo, Kyung-Yeon; Kim, Hyun-Jung
- Issue Date
- 12월-2021
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Atelectasis; General anesthesia; Inspiratory oxygen fraction; Pneumonia; Postoperative outcome
- Citation
- JOURNAL OF CLINICAL ANESTHESIA, v.75
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF CLINICAL ANESTHESIA
- Volume
- 75
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135583
- DOI
- 10.1016/j.jclinane.2021.110461
- ISSN
- 0952-8180
- Abstract
- Objectives: To determine whether high perioperative inspired oxygen fraction (FiO2) compared with low FiO2 has more deleterious postoperative clinical outcomes in patients undergoing non-thoracic surgery under general anesthesia. Design: Meta-analysis of randomized controlled trials. Setting: Operating room, postoperative recovery room and surgical ward. Patients: Surgical patients under general anesthesia. Intervention: High perioperative FiO2 (>= 0.8) vs. low FiO2 (<= 0.5). Measurements: The primary outcome was mortality within 30 days. Secondary outcomes were pulmonary outcomes (atelectasis, pneumonia, respiratory failure, postoperative pulmonary complications [PPCs], and postoperative oxygen parameters), intensive care unit (ICU) admissions, and length of hospital stay. A subgroup analysis was performed to explore the treatment effect by body mass index (BMI). Main results: Twenty-six trials with a total 4991 patients were studied. The mortality in the high FiO2 group did not differ from that in the low FiO2 group (risk ratio [RR] 0.91, 95% confidence interval [CI] 0.42-1.97, P = 0.810). Nor were there any significant differences between the groups in such outcomes as pneumonia (RR 1.19, 95% CI 0.74-1.92, P = 0.470), respiratory failure (RR 1.29, 95% CI 0.82-2.04, P = 0.270), PPCs (RR 1.05, 95% CI 0.69-1.59, P = 0.830), ICU admission (RR 0.94, 95% CI 0.55-1.60, P = 0.810), and length of hospital stay (mean difference [MD] 0.27 d, 95% CI -0.28-0.81, P = 0.340). The high FiO2 was associated with postoperative atelectasis more often (risk ratio 1.27, 95% CI 1.00-1.62, P = 0.050), and lower postoperative arterial partial oxygen pressure (MD -5.03 mmHg, 95% CI -7.90- -2.16, P < 0.001). In subgroup analysis of BMI >30 kg/m2, these parameters were similarly affected between the groups. Conclusions: The use of high FiO2 compared to low FiO2 did not affect the short-term mortality, although it may increase the incidence of atelectasis in adult, non-thoracic patients undergoing surgical procedures. Nor were there any significant differences in other secondary outcomes.
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