Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study
Abstract The correlation between body mass index (BMI) and the outcomes for patients receiving surgical intervention for abdominal aortic aneurysm (AAA) is still debated. Consequently, this study seeks to investigate the association between BMI and mortality following elective open abdominal aortic...
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Nature Portfolio
2025-06-01
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| author | Qin Zhang Jinsong Zhou Changchun Cao Haofei Hu Yong Han |
| author_facet | Qin Zhang Jinsong Zhou Changchun Cao Haofei Hu Yong Han |
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| description | Abstract The correlation between body mass index (BMI) and the outcomes for patients receiving surgical intervention for abdominal aortic aneurysm (AAA) is still debated. Consequently, this study seeks to investigate the association between BMI and mortality following elective open abdominal aortic aneurysm repair (EOAR). This study involves a secondary analysis derived from data collected in a prospective cohort framework. It focuses on individuals who received EOAR across ten vascular surgery centers in Denmark from January 1, 2000, to December 31, 2014. The analysis employed a Cox proportional hazards regression model to examine the connection between BMI and mortality following EOAR. To detect any potential nonlinear associations, Cox regression with cubic spline functions and smooth curve fitting was utilized. Furthermore, we performed numerous sensitivity and subgroup evaluations to ensure the reliability of our results. Upon controlling confounding variables, the analysis demonstrated a clear inverse correlation between BMI and mortality following EOAR. Specifically, each 1 kg/m² increase in BMI corresponded to a 2.7% reduction in mortality risk (HR = 0.973; 95% CI: 0.958–0.988). Compared to individuals with normal weight, those classified as underweight faced a 62.6% higher risk of mortality (HR = 1.626; 95% CI: 1.142–2.314), whereas overweight and obese individuals experienced a reduction in mortality risk by 18.2% (HR = 0.818; 95% CI: 0.722–0.928) and 15.8% (HR = 0.842; 95% CI: 0.721–0.998), respectively. Additionally, the study identified a nonlinear relationship between BMI and postoperative mortality, with a critical point at a BMI of 25.78 kg/m². Below this inflection point, each 1 kg/m² decrease in BMI significantly increased mortality risk by 8% (HR = 0.920; 95% CI: 0.893–0.949). Beyond this inflection point, further increases in BMI did not significantly impact mortality risk. In patients undergoing EOAR, an increase in BMI is significantly negatively associated with postoperative mortality. Additionally, a specific nonlinear relationship exists between BMI and postoperative mortality, with a BMI inflection point at 25.78 kg/m². Clinicians should carefully weigh surgical risks for patients with a BMI under 25.78 kg/m² and consider delaying surgery to enhance nutrition. In contrast, those overweight or obese may not require pre-surgery weight management. |
| format | Article |
| id | doaj-art-453d029ff2494894afe0bd7039f6bbdb |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-453d029ff2494894afe0bd7039f6bbdb2025-08-20T02:31:04ZengNature PortfolioScientific Reports2045-23222025-06-0115111410.1038/s41598-025-05123-9Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort studyQin Zhang0Jinsong Zhou1Changchun Cao2Haofei Hu3Yong Han4Department of Anesthesiology, Longgang Central Hospital of ShenzhenDepartment of Laboratory Medicine, Shenzhen Second People’s HospitalDepartment of Rehabilitation, Longgang E.N.T Hospital & Shenzhen Key Laboratory of E.N.T, Institute of Ear Nose Throat (E.N.T)Department of Nephrology, Shenzhen Second People’s HospitalDepartment of Emergency, Shenzhen Second People’s HospitalAbstract The correlation between body mass index (BMI) and the outcomes for patients receiving surgical intervention for abdominal aortic aneurysm (AAA) is still debated. Consequently, this study seeks to investigate the association between BMI and mortality following elective open abdominal aortic aneurysm repair (EOAR). This study involves a secondary analysis derived from data collected in a prospective cohort framework. It focuses on individuals who received EOAR across ten vascular surgery centers in Denmark from January 1, 2000, to December 31, 2014. The analysis employed a Cox proportional hazards regression model to examine the connection between BMI and mortality following EOAR. To detect any potential nonlinear associations, Cox regression with cubic spline functions and smooth curve fitting was utilized. Furthermore, we performed numerous sensitivity and subgroup evaluations to ensure the reliability of our results. Upon controlling confounding variables, the analysis demonstrated a clear inverse correlation between BMI and mortality following EOAR. Specifically, each 1 kg/m² increase in BMI corresponded to a 2.7% reduction in mortality risk (HR = 0.973; 95% CI: 0.958–0.988). Compared to individuals with normal weight, those classified as underweight faced a 62.6% higher risk of mortality (HR = 1.626; 95% CI: 1.142–2.314), whereas overweight and obese individuals experienced a reduction in mortality risk by 18.2% (HR = 0.818; 95% CI: 0.722–0.928) and 15.8% (HR = 0.842; 95% CI: 0.721–0.998), respectively. Additionally, the study identified a nonlinear relationship between BMI and postoperative mortality, with a critical point at a BMI of 25.78 kg/m². Below this inflection point, each 1 kg/m² decrease in BMI significantly increased mortality risk by 8% (HR = 0.920; 95% CI: 0.893–0.949). Beyond this inflection point, further increases in BMI did not significantly impact mortality risk. In patients undergoing EOAR, an increase in BMI is significantly negatively associated with postoperative mortality. Additionally, a specific nonlinear relationship exists between BMI and postoperative mortality, with a BMI inflection point at 25.78 kg/m². Clinicians should carefully weigh surgical risks for patients with a BMI under 25.78 kg/m² and consider delaying surgery to enhance nutrition. In contrast, those overweight or obese may not require pre-surgery weight management.https://doi.org/10.1038/s41598-025-05123-9Abdominal aortic aneurysmBody mass indexNonlinear associationLong-term prognosisSmooth curve fitting |
| spellingShingle | Qin Zhang Jinsong Zhou Changchun Cao Haofei Hu Yong Han Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study Scientific Reports Abdominal aortic aneurysm Body mass index Nonlinear association Long-term prognosis Smooth curve fitting |
| title | Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| title_full | Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| title_fullStr | Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| title_full_unstemmed | Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| title_short | Body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| title_sort | body mass index and mortality after elective open abdominal aortic aneurysm repair in a fifteen year multicenter cohort study |
| topic | Abdominal aortic aneurysm Body mass index Nonlinear association Long-term prognosis Smooth curve fitting |
| url | https://doi.org/10.1038/s41598-025-05123-9 |
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