Impairment of diastolic function in middle-aged Type 1 (insulin-dependent) and Type 2 (non-insulin-dependent) diabetic patients free of cardiovascular disease

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Abstract
Left ventricular systolic and diastolic function was studied using systolic time intervals and echocardiography in 19 male and 17 female patients with Type 1 (insulin-dependent) diabetes, 24 male and 15 female patients with Type 2 (non-insulin-dependent) diabetes and 24 male and 24 female control subjects. The subjects for the present study were selected from a population based study in which 117 Type 1 and 510 Type 2 diabetic patients and 649 non-diabetic subjects were originally examined. After exclusions, none of the subjects had any evidence of coronary heart disease, hypertension or other diseases known to affect left ventricular function. There were no consistent differences in systolic time intervals or echocardiographic variables of systolic function between patients with Type 1 diabetes and non-diabetic control subjects; but patients with Type 2 diabetes showed an increased fractional shortening. Female patients with Type 2 diabetes showed an increased left ventricular mass not explicable by hypertension. Isovolumic relaxation period was longer in male (86±3 ms; mean±SEM) and female patients (84±6 ms) with Type 2 diabetes than in male (76±3 ms; ppppp<0.001) with Type 2 diabetes as compared to male (14.4±0.7 cm/s) and female (14.9±0.5 cm/s) control subjects. In male patients with Type 1 diabetes the respective value (12.7±0.6 cm/s) did not differ significantly from that in male control subjects. Altogether 14 diabetic patients (26%) showed an abnormal low peak diastolic filling rate. The impaired diastolic filling among diabetic patients did not show any relationship to the duration and metabolic control of diabetes or the presence of microangiopathy, but a weak correlation was found between the peak diastolic filling rate and the diminution of heart rate variation suggestive of the presence of diabetic autonomic neuropathy.