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Haemodynamic variables (plasma volume, heart rate, blood pressure, cardiac output, stroke volume, pulmonary tissue volume, total peripheral vascular resistance, hepato-splanchnic vascular resistance, lower extremity vascular resistance and plasma catecholamines) were measured before and after insulin-induced hypoglycaemia in seven healthy men. Plasma volume decreased significantly at the nadir of glucose (mean decrease 222 +/- 41 ml) and subsequently increased to pre-hypoglycaemic values within 30 min. Cardiac output increased in response to hypoglycaemia (mean increase 2.8 +/- 0.61/min). The early rise in cardiac output was primarily due to an increase in heart rate, but later mainly due to increased stroke volume. Since pulmonary tissue volume was constant, the observed changes in cardiac output are unlikely to be due to a Frank-Starling mechanism but rather to increased sympatho-adrenal activity. Total peripheral vascular resistance as well as lower extremity vascular resistance decreased, whereas hepato-splanchnic vascular resistance was unaffected. Thus insulin-induced hypoglycaemia has marked transient effects on the circulation.

Haemodynamic changes in insulin-induced hypoglycaemia in normal man