To examine the mechanism of cardiac dysfunction in diabetes, total circulating blood volume, cardiac and stroke volumes were measured by radioisotope method in 44 patients with type 1 and type 2 diabetes. Considerable difference in actually circulating blood volume could be demonstrated in diabetic patients, which seemed to be dependent on the control of the carbohydrate metabolism. The achievement of well controlled carbohydrate metabolism in diabetics has a great importance with special respect also to the blood volumes.
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