title: Agreement and association between the phase angle and parameters of nutritional status assessment in surgical patients.
abstract: OBJECTIVE
  To assess the agreement and the association between phase angle (PA) and parameters of nutritional status in surgical patients.
  
  
  METHODS
  This was a cross-sectional study that involved 98 patients admitted for elective gastrointestinal or hernia repair surgery. The risk and nutritional status were evaluated through Nutritional Risk Screening 2002 (NRS 2002), Subjective Global Assessment (SGA), Body Mass Index (BMI) and Total Lymphocytes Count (TLC). These assessments were compared with the mean standardized PA (SPA), obtained by Bioelectrical Impedance Analysis (BIA). Statistical analysis included kappa coefficient, Student's t-test, Mann-Whitney test, and the construction of a ROC Curve.
  
  
  RESULTS
  The highest kappa agreement was obtained between the SPA and the SGA (0.27; CI95% 0.06-0.48). Malnourished patients diagnosed by NRS 2002, SGA and TLC had a significantly lower mean SPA as compared to those who were well-nourished. A cut-off point of 0.8 for SPA showed 82.6% (CI95% 65.0-100.0%) sensitivity and 40.6% (CI95% 23.0-58.2%) specificity.
  
  
  CONCLUSIONS
  The SPA presented weak agreement with the methods of nutritional assessment, as well as low specificity, and could not be recommended as a marker of nutritional status, despite the fact that the lowest values for SPA were found in malnourished patients.
authors: Federal University of Santa Catarina, Florianópolis, SC, Brazil.
authors: L
authors: L
authors: Scheunemann
authors: E
authors: E
authors: Wazlawik
authors: J L
authors: JL
authors: Bastos
authors: T
authors: T
authors: Ristow Cardinal
authors: L
authors: L
authors: Mayumi Nakazora
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D017097:Electric Impedance; D005260:Female; D006761:Hospitals; D006801:Humans; D018655:Lymphocyte Count; D008297:Male; D044342:Malnutrition / Q000175:diagnosis* / Q000453:epidemiology; D008875:Middle Aged; D015596:Nutrition Assessment; D009752:Nutritional Status / Q000502:physiology*; D011183:Postoperative Complications; D012372:ROC Curve; D018570:Risk Assessment; D055815:Young Adult