title: Effect of weight loss after bariatric surgery on skin and the extracellular matrix.
abstract: BACKGROUND
  Obese patients experience dramatic physical and metabolic changes in the skin and its collagen. Bariatric surgery is known to result in significant improvement in obesity-associated comorbid conditions and metabolic disturbances. The aim of this study was to evaluate skin quality following weight loss surgery and its suitability to produce an extracellular matrix for use in reconstructive procedures.
  
  
  METHODS
  During circumferential lipectomy, skin tissue was obtained from 10 patients following bariatric surgery. The samples were subjected to histologic examination and to study by differential scanning calorimetry. A retrospective review of patient records was used to determine time between bariatric and body lift procedures and to identify subject demographic and clinical data, including body mass index, excess weight loss, and comorbid conditions.
  
  
  RESULTS
  Plastic surgery followed bariatric surgery by 20.5 +/- 11 months, and patients experienced an average weight loss of 132.1 +/- 61.0 lb. Histologic evaluation of post-bariatric surgery skin samples showed a poorly organized collagen structure, elastin degradation, and regions of scar formation within macroscopically normal areas. Differential scanning calorimetry showed increased enthalpy of phase transition and decreased onset temperature for collagen denaturation in striae distensae samples compared with bulk bariatric skin samples, consistent with tissue matrix degradation in striae.
  
  
  CONCLUSIONS
  Skin tissue in this patient population exhibited significant signs of damage to extracellular matrix components despite the duration of time since the bariatric procedure.
authors.affiliation: New York, N.Y.; and Ewing, N.J. From the Department of Surgery and the Division of Plastic Surgery, Department of Surgery, Lenox Hill Hospital; the Department of Chemistry, College of New Jersey; and private practice.
authors.forename: David
authors.initials: D
authors.lastname: Light
authors.forename: Georgia M
authors.initials: GM
authors.lastname: Arvanitis
authors.forename: David
authors.initials: D
authors.lastname: Abramson
authors.forename: Scot B
authors.initials: SB
authors.lastname: Glasberg
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002152:Calorimetry, Differential Scanning; D003094:Collagen / Q000378:metabolism; D005109:Extracellular Matrix / Q000473:pathology*; D005260:Female; D015390:Gastric Bypass; D006801:Humans; D015187:Lipectomy; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000473:pathology / Q000601:surgery; D011184:Postoperative Period; D012189:Retrospective Studies; D012867:Skin / Q000473:pathology*; D015431:Weight Loss / Q000502:physiology*
chemical_list: D003094:Collagen