• Seung-Hwa Lee, Kwangmo Yang, Jungchan Park, Jong Hwan Lee, Jeong Jin Min, Ji-Hye Kwon, Junghyun Yeo, Jihoon Kim, Cheol Won Hyeon, Jin-Ho Choi, Sang-Chol Lee, Hyeon-Cheol Gwon, Kyunga Kim, Joonghyun Ahn, and Sangmin Maria Lee.
• From the Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute.
• Anesth. Analg. 2021 Apr 1; 132 (4): 960-968.

BackgroundDespite an association between obesity and increased risks for various diseases, obesity has been paradoxically reported to correlate with improved mortality in patients with established cardiovascular disease. However, its effect has not been evaluated to date in patients with myocardial injury after noncardiac surgery (MINS).MethodsFrom January 2010 to June 2019, of a total of 35,269 adult patients with postoperative cardiac troponin level data, 5633 (16.0%) patients had MINS as diagnosed by postoperative cardiac troponin I above the 99th-percentile upper reference of 40 ng·L-1 using the TnI-Ultra immunoassay. Patients with MINS were divided into 3 groups according to body mass index (BMI), with 3246 (57.6%) were in the normal (18.5-25 kg·m-2), 425 (7.5%) in the low BMI (<18.5 kg·m-2), and 1962 (34.8%) in the high BMI (≥25 kg·m-2) groups, respectively. The primary outcome was mortality during the first year after surgery, and the mortality during 30 days was also compared.ResultsFollowing adjustment for confounding with inverse probability of treatment weighting, mortality within the first year appeared to be significantly lower in the high BMI group compared with the normal (14.8% vs 20.9%; hazard ratio [HR], 0.75; 95% confidence interval [CI], 0.66-0.85; P < .001) and the low BMI (14.8% vs 25.6%; HR: 0.56; 95% CI, 0.48-0.66; P < .001) groups.ConclusionsHigh BMI may be associated with decreased mortality following MINS. Further investigations are needed to support this finding.Copyright © 2020 International Anesthesia Research Society.

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