| Abstrakt: |
The effects of human and porcine insulins on the symptomatic, physiological, and counterregulatory hormonal responses to acute hypoglycaemia were compared in 40 patients with Type 1 diabetes, 20 of whom were newly diagnosed while 20 had been treated for between 5 and 20 years. In a double‐blind, cross‐over trial all patients were treated with human or porcine insulin, in random order, for two consecutive 3‐month periods. At the end of each treatment period they were subjected to an acute episode of experimental hypoglycaemia induced by a continuous intravenous infusion (2.0 mU kg−1min−1) of the same insulin species. Haemodynamic, sweating, and tremor responses were measured during both studies, symptom scores were recorded and the arterialized plasma glucose thresholds for autonomic activation and the onset of subjective symptoms were identified. In all patients the glycaemic thresholds for the initiation of the autonomic physiological responses to hypoglycaemia and the onset of the symptomatic response were concurrent and did not differ with insulin species (plasma glucose 1.94 vs 1.96 mmol l−1, human vs porcine studies). The onset, temporal pattern, nature, and magnitude of the physiological responses (sweating, heart rate, blood pressure, and tremor) during acute experimental hypoglycaemia were also identical with each insulin species. The magnitude and temporal pattern of the response of counterregulatory hormones (adrenaline, noradrenaline, glucagon, ACTH, and GH) to hypoglycaemia as induced by human and porcine insulins were indistinguishable, as were the total and individual scores of autonomic and neuroglycopenic symptoms. In conclusion, in patients who had newly diagnosed and intermediate duration (5–20 years) of diabetes, the symptomatic, physiological, and counterregulatory hormonal responses to acute insulin‐induced hypoglycaemia did not differ between human and porcine insulins, and the plasma glucose thresholds at which the symptomatic and autonomic responses were initiated were identical with both insulin species. This study does not support the hypothesis that treatment with human insulin modifies the symptomatic, physiological, and counterregulatory hormonal responses to acute hypoglycaemia. |
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