title: Determinants of skeletal muscle catabolism after severe burn.
abstract: OBJECTIVE
  To determine which patient factors affect the degree of catabolism after severe burn.
  
  
  BACKGROUND
  Catabolism is associated with severe burn and leads to erosion of lean mass, impaired wound healing, and delayed rehabilitation.
  
  
  METHODS
  From 1996 to 1999, 151 stable-isotope protein kinetic studies were performed in 102 pediatric and 21 adult subjects burned over 20-99. 5% of their total body surface area (TBSA). Patient demographics, burn characteristics, and hospital course variables were correlated with the net balance of skeletal muscle protein synthesis and breakdown across the leg. Data were analyzed sequentially and cumulatively through univariate and cross-sectional multiple regression.
  
  
  RESULTS
  Increasing age, weight, and delay in definitive surgical treatment predict increased catabolism (P < .05). Body surface area burned increased catabolism until 40% TBSA was reached; catabolism did not consistently increase thereafter. Resting energy expenditure and sepsis were also strong predictors of net protein catabolism. Among factors that did not significantly correlate were burn type, pneumonia, wound contamination, and time after burn. From these results, the authors also infer that gross muscle mass correlates independently with protein wasting after burn.
  
  
  CONCLUSIONS
  Heavier, more muscular subjects, and subjects whose definitive surgical treatment is delayed are at the greatest risk for excess catabolism after burn. Sepsis and excessive hypermetabolism are also associated with protein catabolism.
authors.affiliation: Department of Surgery, The University of Texas Medical Branch. Galveston, Texas, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Hart
authors.forename: S E
authors.initials: SE
authors.lastname: Wolf
authors.forename: D L
authors.initials: DL
authors.lastname: Chinkes
authors.forename: D C
authors.initials: DC
authors.lastname: Gore
authors.forename: R P
authors.initials: RP
authors.lastname: Mlcak
authors.forename: R B
authors.initials: RB
authors.lastname: Beauford
authors.forename: M K
authors.initials: MK
authors.lastname: Obeng
authors.forename: S
authors.initials: S
authors.lastname: Lal
authors.forename: W F
authors.initials: WF
authors.lastname: Gold
authors.forename: R R
authors.initials: RR
authors.lastname: Wolfe
authors.forename: D N
authors.initials: DN
authors.lastname: Herndon
mesh_terms: D000328:Adult; D001830:Body Surface Area; D001835:Body Weight; D002056:Burns / Q000378:metabolism* / Q000601:surgery; D002153:Calorimetry, Indirect; D002648:Child; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D007866:Leg; D008297:Male; D009124:Muscle Proteins / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000378:metabolism*; D012044:Regression Analysis; D012307:Risk Factors; D014946:Wound Infection / Q000378:metabolism
chemical_list: D009124:Muscle Proteins