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Prinzmetal's variant form of angina as a manifestation of alpha-adrenergic receptor-mediated coronary artery spasm: documentation by coronary arteriography.
American Heart Journal 1976 Februrary
In four patients with Prinzmetal's variant form of angina, the attack was induced by the combined administration of epinephrine (0.4 to 0.5 mg, given subcutaneously at 7:30 to 8:00 A.M.) and propranolol (40 mg. given orally at 5:00 A.M.). Selective coronary cinearteriography was done before, during, and after the attack with constant monitoring of the ECG and blood pressure. Severe spasm of the right coronary artery occurred at the proximal portion in association with ST-segment elevation in Lead III during the attack and disappeared with the subsidence of the attack in all of them. These results strongly suggest that severe spasm of a large coronary artery mediated by alpha-adrenergic receptors is responsible for the attack of Prinzmetal's variant form of angina.
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