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Hypercobalaminemia induced by an energy drink after total gastrectomy: a case report
Kazuhiro Takahashi1, Shigeki Tsukamoto2, Yuta Kakizaki2
1Division of Gastroenterological and Hepatobiliary Surgery, and Organ Transplantation, Department of Surgery, University of Tsukuba.
Abstract:
We encountered a case of hypercobalaminemia induced by oral intake of an energy drink after total gastrectomy. The patient was referred to our hospital due to findings suspicious for gastric cancer on screening. A 20 mm type 0-IIc lesion was detected in the gastric subcardia on esophagogastroduodenoscopy. Total gastrectomy followed by Roux-en-Y reconstruction was performed. He was discharged without complications. His basal serum vitamin B12 level was initially maintained with monthly intramuscular injections of vitamin B12. After 9 months, his serum vitamin B12 level suddenly increased up to 36-fold higher than the normal range and persisted there for one year without vitamin B12 injections. The patient ultimately reported consuming half a bottle of an energy drink each day during this time period. This case demonstrates the risk of unexpected hypervitaminemia resulting from self-administration of nutritional supplements.
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