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Subclinical left ventricular abnormalities in young diabetics.

Twenty young asymptomatic diabetic patients were evaluated for left ventricular dysfunction by determining the radionuclide ejection fraction response to supine bicycle ergometry. The double product at peak exercise (28,743 +/- 3,314 vs 29,007 +/- 3,625, p greater than .05) was not significantly different between the two groups. Seven of 20 diabetics had either no change or a drop in their ejection fraction during exercise while 1 of 20 control subjects had no change in ejection fraction. There was no correlation between the FBS (r = .26) and HbA1c (r = .32) and ejection fraction change during exercise, although those diabetics with LV dysfunction tended to have a higher HbA1c level as compared to diabetics with a normal response (16.8 +/- 3.1 percent vs 12.5 +/- 3.8 percent respectively, p greater than .05). The LV systolic dysfunction in young asymptomatic diabetic subjects does not appear to correlate with the degree of acute or chronic hyperglycemia, and therefore, is not a direct function of the dynamic metabolic state of diabetes.