title: Phase angle assessment by bioelectrical impedance analysis and its predictive value for malnutrition risk in hospitalized geriatric patients.
abstract: BACKGROUND
  Phase angle (PhA) value determined by bioelectrical impedance analysis (BIA) is an indicator of cell membrane damage and body cell mass. Recent studies have shown that low PhA value is associated with increased nutritional risk in various group of patients. However, there have been only a few studies performed globally assessing the relationship between nutritional risk and PhA in hospitalized geriatric patients. The aim of the study is to evaluate the predictive value of the PhA for malnutrition risk in hospitalized geriatric patients.
  
  
  METHODS
  One hundred and twenty-two hospitalized geriatric patients were included in this cross-sectional study. Comprehensive geriatric assessment tests and BIA measurements were performed within the first 48 h after admission. Nutritional risk state of the patients was determined with NRS-2002. Phase angle values of the patients with malnutrition risk were compared with the patients that did not have the same risk. The independent variables for predicting malnutrition risk were determined. SPSS version 15 was utilized for the statistical analyzes.
  
  
  RESULTS
  The patients with malnutrition risk had significantly lower phase angle values than the patients without malnutrition risk (p = 0.003). ROC curve analysis suggested that the optimum PhA cut-off point for malnutrition risk was 4.7° with 79.6 % sensitivity, 64.6 % specificity, 73.9 % positive predictive value, and 73.9 % negative predictive value. BMI, prealbumin, PhA, and Mini Mental State Examination Test scores were the independent variables for predicting malnutrition risk.
  
  
  CONCLUSIONS
  PhA can be a useful, independent indicator for predicting malnutrition risk in hospitalized geriatric patients.
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey. drhacerdogan84@hotmail.com.
authors.forename: Hacer Dogan
authors.initials: HD
authors.lastname: Varan
authors.affiliation: Department of Internal Medicine, Hacettepe University School of Medicine, Ankara, Turkey.
authors.forename: Basak
authors.initials: B
authors.lastname: Bolayir
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Ozgur
authors.initials: O
authors.lastname: Kara
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Gunes
authors.initials: G
authors.lastname: Arik
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Muhammet Cemal
authors.initials: MC
authors.lastname: Kizilarslanoglu
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Mustafa Kemal
authors.initials: MK
authors.lastname: Kilic
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Sumer
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Mehmet Emin
authors.initials: ME
authors.lastname: Kuyumcu
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Yesil
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Burcu Balam
authors.initials: BB
authors.lastname: Yavuz
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Meltem
authors.initials: M
authors.lastname: Halil
authors.affiliation: Division of Geriatric Medicine, Department of Internal Medicine, Hacettepe University School of Medicine, 06100, Ankara, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Cankurtaran
mesh_terms: D000368:Aged; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D015577:Geriatric Assessment / Q000379:methods; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D044342:Malnutrition / Q000175:diagnosis / Q000517:prevention & control; D015596:Nutrition Assessment; D009752:Nutritional Status; D011237:Predictive Value of Tests; D012372:ROC Curve; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D012680:Sensitivity and Specificity
keywords: Geriatric patients; Malnutrition; Phase angle