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Journal of Clinical Endocrinology & Metabolism, Vol 56, 876-882, Copyright © 1983 by Endocrine Society

ARTICLES

Effects of nonselective and beta-1-selective blockade on glucose metabolism and hormone responses during insulin-induced hypoglycemia in normal man

UB Lauridsen, NJ Christensen and J Lyngsoe

The effects of nonselective beta-blockade (propranolol) and beta-1- selective blockade (atenolol) on glucose metabolism during insulin- induced hypoglycemia were studied in eight normal subjects during constant infusion of 3-[3H]glucose. Propranolol and to a lesser extent atenolol prolonged the hypoglycemic response to insulin. After maximal hypoglycemia a significant increase in glucose uptake rate was seen after propranolol and a corresponding trend was found in the atenolol experiments. The two beta-blockers did not influence glucose production rate after insulin administration. FFA concentration declined rapidly after insulin. Propranolol delayed the subsequent normalization of FFA whereas atenolol had no significant effect. Propranolol increased epinephrine and GH responses to hypoglycemia, whereas atenolol had no effect. Neither of the two beta-blockers influenced the concentrations of glucagon, norepinephrine, and PRL. It is concluded that nonselective beta-blockade prolongs the hypoglycemic response to insulin through an increased tissue uptake of glucose which is not counteracted by an increased glucose production. It is suggested that nonselective beta- blockade increases muscle glucose uptake by lowering FFA concentrations. beta-Blocker inhibition of the antiinsulin effect of epinephrine on glucose uptake in muscle can, however, not be excluded.


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Copyright © 1983 by The Endocrine Society