title: Gastric intrinsic factor production and vitamin B12 absorption after oesophageal resection using stomach as substitute.
abstract: OBJECTIVE
  To investigate whether the use of the stomach as a substitute after oesophageal resections causes disturbances in vitamin B12 absorption due to deficient intrinsic factor (IF) production.
  
  
  METHODS
  Eleven patients operated upon with oesophageal resection a.m. Ivor Lewis, for malignant (10) or benign (1) conditions of the oesophagus were examined with a postoperative dual isotope technique 11-41 months (mean 25 months) after operation.
  
  
  RESULTS
  In two patients the test showed abnormally low absorption of vitamin B12. One of these probably due to incomplete urine collection during the test period. However, no patient showed deficient intrinsic factor production with absorption ratios between vitamin B12 +/- IF of 0.87-1.14 (reference interval: 0.70-1.20).
  
  
  CONCLUSIONS
  Deficiency of intrinsic factor is neither an obligatory nor a common occurrence after oesophageal resection with gastric substitute. However, vitamin B12 absorption may be low due to other factors, and should be looked for in all patients surviving more than a couple of months postoperatively.
authors.affiliation: Department of Cardiothoracic Surgery, Aalborg Hospital, Denmark.
authors.forename: E
authors.initials: E
authors.lastname: Hjelms
authors.forename: P
authors.initials: P
authors.lastname: Thirup
authors.forename: L
authors.initials: L
authors.lastname: Schou
mesh_terms: D000042:Absorption; D000368:Aged; D004938:Esophageal Neoplasms / Q000473:pathology / Q000601:surgery*; D016629:Esophagectomy / Q000009:adverse effects / Q000379:methods*; D005260:Female; D005748:Gastric Fundus / Q000637:transplantation*; D006801:Humans; D007437:Intrinsic Factor / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D010295:Parietal Cells, Gastric / Q000378:metabolism*; D011379:Prognosis; D018570:Risk Assessment; D014805:Vitamin B 12 / Q000032:analysis / Q000378:metabolism*
chemical_list: D007437:Intrinsic Factor; D014805:Vitamin B 12