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Autonomic Function and Heart Rate in Young Diabetic Patients

We assessed whether heart rate and autonomic function abnormalities occur in young Type 1 diabetic patients (n=55) by comparing them with nondiabetic subjects of similar age (n=34). Supine and standing heart rates were significantly higher (p<0.01) in diabetic patients. Differences tended to occur even in those subjects not fully mature (Tanner stages 1-4). The supine heart rate was positively related (r=0.37, p<0.01), and the Respiratory and 30:15 Ratios inversely related (r=-0.39, p<0.01 and r=-0.27, p=0.05 respectively) to hemoglobin Ai. Although there was no overall difference, a greater proportion of patients had low Respiratory Ratio values (p<0.05). The patients with low values had significantly higher resting supine heart rates (p<0.01) and higher hemoglobin A t levels (p<0.05) than those with normal values. This study confirms data from a prior study indicating that heart rate is elevated early in the course of Type 1 diabetes. In addition, it suggests that both heart rate and autonomic function in these patients are related to metabolic factors.