title: Fewer nutrient deficiencies after laparoscopic sleeve gastrectomy (LSG) than after laparoscopic Roux-Y-gastric bypass (LRYGB)-a prospective study.
abstract: BACKGROUND
  Deficiencies in micronutrients after bariatric operations are frequent, despite routine supplementation. Main outcome measures were pre- and postoperative frequency of nutrient deficiencies and success rate of their treatment.
  
  
  METHODS
  Between 5/2004 and 12/2006, 136 patients (m:f = 0:4) with an average body mass index of 45 (35-58) kg/m(2) and age of 53 (21-66) years were prospectively analysed. Laparoscopic Roux-Y-gastric bypass (LRYGB) was performed in 86 patients and laparoscopic sleeve gastrectomy (LSG) was performed in 50 patients. The patients were examined before surgery as well as 3, 6, 12, 24, 30, and 36 months postoperatively using a standard protocol including laboratory tests. The mean follow-up time was 24.4 (12-40) months; the follow-up rate was 100%.
  
  
  RESULTS
  Prior to surgery, 57% of the patients had at least one deficiency, 23% of whom had vitamin D(3) deficiency. Frequent postoperative deficiencies after LSG were zinc, vitamin D(3), folic acid, iron, and vitamin B(12); after LRYGB, vitamin B(12), vitamin D(3), zinc, and secondary hyperparathyroidism. No vitamin B(1) or B(6) deficiencies were found. Calcium levels were normal in all patients. Treatment of the deficiencies was mostly successful.
  
  
  CONCLUSIONS
  Preoperatively, 57% of morbidly obese patients already had a deficiency. Postoperatively, significantly more vitamin B(12) and vitamin D deficiencies and hyperparathyroidism were found in patients who had undergone LRYGB. After LSG, folate deficiency was more frequent (but not significantly so). Calcium levels were normal in all patients; therefore, parathyroid hormone and vitamin D(3) levels are more sensitive markers for early detection of disorders of calcium metabolism. Iron deficiency anaemia is most efficiently treated by IV therapy.
authors.affiliation: Department of Surgery, St. Claraspital, Kleinriehenstrasse 30, Basel, Switzerland.
authors.forename: Simone
authors.initials: S
authors.lastname: Gehrer
authors.forename: Beatrice
authors.initials: B
authors.lastname: Kern
authors.forename: Thomas
authors.initials: T
authors.lastname: Peters
authors.forename: Caroline
authors.initials: C
authors.lastname: Christoffel-Courtin
authors.forename: Ralph
authors.initials: R
authors.lastname: Peterli
mesh_terms: D000328:Adult; D000368:Aged; D001361:Avitaminosis / Q000209:etiology*; D005260:Female; D005743:Gastrectomy / Q000009:adverse effects* / Q000379:methods; D015390:Gastric Bypass / Q000009:adverse effects*; D006801:Humans; D010535:Laparoscopy; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000150:complications / Q000601:surgery*; D011446:Prospective Studies; D055815:Young Adult