The value of phase angle in predicting malnutrition in elderly patients undergoing pancreatic and biliary surgery
10.3760/cma.j.issn.0254-9026.2025.07.010
- VernacularTitle:相位角在拟行胰腺和胆道手术治疗的老年患者营养不良诊断中的价值
- Author:
Lijuan WANG
1
;
Pengxue LI
;
Lili DING
;
Bo CHENG
;
Lei LI
;
Jingyong XU
Author Information
1. 北京医院临床营养科 国家老年医学中心 中国医学科学院老年医学研究院，北京 100730
- Publication Type:Journal Article
- Keywords:
Surgical procedures, operative;
Malnutrition;
Diagnosis;
Phase angle
- From:
Chinese Journal of Geriatrics
2025;44(7):904-910
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the correlation between phase angle and malnutrition, and to determine the malnutrition cut-off point based on phase angle in elderly patients undergoing pancreatic and biliary surgery.Methods:In a case control study, we collected data from 190 elderly inpatients scheduled for pancreatic and biliary surgery at the Department of General Surgery of Beijing Hospital from December 2021 to July 2024.We recorded the subjects' baseline data, dietary survey results, and anthropometric measurements.The phase angle was calculated using the InBody 720 Body Composition Analyzer, and malnutrition was diagnosed according to the Global Leadership Initiative on Malnutrition(GLIM)criteria.Results:A total of 190 cases were included in the study, of which 111(58.4%)were male, aged 60~90(70.44±7.01) years.The prevalence of malnutrition and severe malnutrition was found to be 65.8% and 23.2%, respectively.As malnutrition worsened, the phase angle decreased( P<0.001 for trend).The phase angle in the malnutrition group was significantly lower than that in the normal group( P<0.001).Furthermore, the phase angle was positively correlated with body mass index(BMI), appendicular skeletal muscle mass index(ASMI), fat-free mass index(FFMI), total energy intake, and albumin, while it was negatively correlated with the percentage of weight loss(all P<0.05).The cut-off point of the phase angle for predicting malnutrition in elderly patients undergoing pancreatic and biliary surgery was determined to be 4.42°, sensitivity 80.0%, specificity 58.4%, area under the curve 0.698(95% CI: 0.621~0.775, P<0.001).A low phase angle(≤4.42°)was positively correlated with the occurrence of malnutrition( OR=9.133, 95% CI: 2.894~28.826, P<0.001). Conclusions:The present study suggests that phase angle may serve as a simple and valid indicator of malnutrition in elderly patients undergoing pancreatic and biliary surgery.
