search for


Effect of Obesity on 30-Day Mortality in Critically Ill Surgical Patients
비만이 외과 중환자에서 30일 사망률에 미치는 영향
J Clin Nutr 2018;10:51-55
Published online December 31, 2018
© 2018 Korean Society for Parenteral and Enteral Nutrition.

Jung Yeob Ko1, Yun Tae Jung2, Jae Gil Lee1
고정엽1, 정윤태2, 이재길1

1Department of Surgery, Yonsei University College of Medicine, Seoul, 2Department of Surgery, Ajou University School of Medicine, Suwon, Korea
1연세대학교 의과대학 외과학교실, 2아주대학교 의과대학 외과학교실
Jae Gil Lee, Department of Surgery, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea Tel: +82-2-2228-2100, Fax: +82-2-313-8289,
Received July 23, 2018; Revised November 21, 2018; Accepted November 23, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose: This study was conducted to assess how extreme obesity affects 30-day mortality in this patient group.
Methods: A total of 802 patients who underwent emergency gastrointestinal surgery from January 2007 to December 2017 were retrospectively reviewed. Patients were divided into three groups according to their body mass index (BMI): group 1, normal weight (BMI: 18.5∼22.9 kg/m2); group 2, overweight (BMI: 23.0∼29.9 kg/m2); and group 3, obesity (BMI≥30 kg/m2). Patients with a BMI under 18.5 were excluded from the analysis. Chi-squared test, Fisher’s exact test, Kaplan-Meier survival analysis, and the log-rank test were used to assess and compare 30-day mortality rates between groups.
Results: The mortality rates of group 1, group 2, and group 3 were 11.3%, 9.0%, and 26.9%, respectively (P<0.017). The mortality rate did not differ significantly between group 1 and 2 (11.3% vs. 9.0%; P=0.341), but group 1 and 2 showed better survival rates than group 3 (11.3% vs. 26.9%; P=0.028, 9.0% vs. 26.9%; P=0.011). Kaplan-Meier survival analysis revealed that group 3 had higher mortality than the other two groups (P=0.001).
Conclusion: Obesity (BMI≥30 kg/m2) was one of the risk factors influencing critically ill patients who underwent emergency surgery.
Keywords : Body mass index, Obesity, Mortality, Critical illness


December 2018, 10 (2)