ROBERT F. SCHILLING, M.D.; PAUL N. GOHDES, M.D.; GORDON H. HARDIE, M.D.
Gastric bypass surgery for obesity is a popular and partially effective operation. There are few studies of changes in chemistry after this operation. Wernicke-Korsakoff encephalopathy was seen in two patients at 3 months after bypass surgery (1). In one patient megaloblastic anemia appeared 6 years after surgery (2). Serum vitamin B12 was below normal in 26% of 69 patients (3). We are not aware of studies of vitamin B12 absorption or of the effect of oral supplementation in patients who have had bypass surgery. After a low serum vitamin B12 level was found in several patients, this study was done.
SCHILLING RF, GOHDES PN, HARDIE GH. Vitamin B12 Deficiency After Gastric Bypass Surgery for Obesity. Ann Intern Med. 1984;101:501–502. doi: 10.7326/0003-4819-101-4-501
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Published: Ann Intern Med. 1984;101(4):501-502.
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