A fifty-two years old male, had had diabetes mellitus for four years, had maintained good control with 0.5 g of chlorpropamide daily, and had had no retinopathy, nephropathy, or neuropathy. Before admission he erroneously took 1.0 g of chlorpropamide daily for fourteen days. On the fifteenth day he became hypoglycemic, with drowsiness and abnormal behavior. On the sixteenth day, he was admitted to our hospital.
The results of our clinical investigation may be summarized as follows:
1) The lowering of the serum chlorpropamide concentration in this case was more prompt than in the other cases reported.
2) Low blood glucose levels (33-43 mg/d
l) and high serum IRI levels (83-86μU/m
l) were observed for several hours after admission. When the blood sugar levels increased to 122mg/d
l from the initial low level of below 77 mg/d
l, the serum IRI levels decreased to 53μU/m
l from the initial high level of over 80μU/m
l. Higher levels of fasting serum IRI were observed after he had recovered from the hypoglycemia while hospitalized.
3) Although higher serum HGH levels were observed on the first day of admission, all of the values obtained while he was hospitalized were within normal limits.
4) On the first day of hospitalization, the serum 11-OHCS levels were higher and showed abnormal diurnal variation, but on the subsequent days, after the patient's recovery from the hypoglycemia, normal diurnal variations recurred.
5) The serum thyroxin levels were low on the first day of hospitalization, and then returned to normal little by little. In contrast to this, the serum resin-sponge uptakes of T3-1311 were within normal limits throughout the hospital stay. These results coincided with the hypothesis, that chlorpropamide inhibits the binding of the thyroxin to thyroxinbinding globulin.
6) Markedly low levels of serum total cholesterol were observed in the first three days of hospitalization. We have found no reports pointing out the hypocholesterolemia during hypoglycemia which our results showed to be noticeable.
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