We report on a severely dehydrated patient with diabetic ketoacidosis associated with rhabdomyolysis following overconsumption of sugar-containing soft drinks. A 16-year-old boy who had severe obesity (body mass index 35 kg/m
2) was admitted to our hospital because of unconsciousness. His HbA1c level was 10.8% suggesting that he was a diabetic. He caught a cold a week before admission. Increased insulin requirement due to upper respiratory tract infection might have exaggerated his hyperglycemia. Since then he had been thirsty and drank about 10, 000 m
l of sugarcontaining soft drinks per day for seven days, and became comatose. On admission, laboratory examination showed metabolic acidosis (pH 7.05), hyperglycemia (plasma glucose: 1, 723 mg/d
l), hyper-ketonemia (3-β-hydroxybutyric acid: 6, 110 μmol/
l ; acetoacetic acid: 650 μmol/
l) and hyper-myoglobinemia (14, 000 ng/m
l). We diagnosed his condition as diabetic ketoacidosis associated with rhabdomyolysis. Although over 10, 000 m
l day was infused from the first to third hospital day, his central venous pressure remained very low (0 cmH
2O), indicating severe dehydration. On the third day, he completely recovered consciousness, and oral intake and subcutaneous insulin injection were begun. After treatment with insulin for 28 days, his diabetes could be controlled with diet and exercise. Serum and urinary C-peptide levels were high on the ninth hospital day (1.6ng/m
l, 184 μg/day, respectively) and anti-GAD antibody was negative. He was diagnosed as having non-insulin dependent diabetes mellitus.
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