<prompt> Which of the follwing patients is most likely to be treated with intravenous glucagon?A young man who took cocaine and has a blood pressure of 190110 mm HgA middle aged man with type II diabetes who has not taken his regular dose of glipizide for last 4 daysAn old man with severe bradycardia and hypotension resulting from ingestion of overdose of atenololAn old woman with lactic acidosis as a complication of severe infection and shock  <response>: Ref: KDT 6e p274 Glucagon is the antidote of b-blocker poisoning. It acts by increasing cAMP in the hea stimulation of glucagon receptors. Cyclic AMP stinulates the hea. Calcium gluconate can also be used for the treatment of b-blocker poisoning. 