PMID: 1109243Jan 1, 1975Paper

Mechanism of the bradycardia during coronary angiography

The American Journal of Cardiology
R J FrinkH M Lowe

Abstract

Bradycardia occurring during coronary angiography may be due to the direct effect of dye or to reflex vagal effects on pacemaker centers. Fifteen patients were classified according to the origin of the sinus nodal and atrioventricular nodal arteries. In patients with type A anatomy, both the sinus and the atrioventricular nodal arteries arose from the right coronary artery. In those with type B anatomy, only the atrioventricular nodal artery arose from the right coronary artery. Heart rate recordings were made during coronary angiography before and after selective infusion of atropine (0.2mg) into the right coronary artery. In type A patients, the sinus bradycardia observed during right coronary dye injection was caused by a combination of both direct and reflex effects on pacemaker tissue. Sinus bradycardia occurring with left coronary dye injections was entirely reflex in nature and was completely blocked with right coronary arterial injection of atropine. In type B patients, sinus bradycardia with right coronary dye injections was produced by reflex suppression of the sinus pacemaker. A junctional rhythm was consistently produced after administration of atropine. Junctional bradycardia in type B patients was caused by direct...Continue Reading

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Sep 1, 1973·Circulation·R J Linden
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Citations

Apr 1, 1978·Clinical Cardiology·P RentropK Nitsche
Jan 1, 1995·Surgical and Radiologic Anatomy : SRA·L J DiDioJ C Prates
Jan 1, 1982·Cardiovascular and Interventional Radiology·A Weikl, M Hubmann
Nov 1, 1984·Progress in Cardiovascular Diseases·J C Longhurst
Jan 1, 1981·Catheterization and Cardiovascular Diagnosis·K L RichardsD E Hoekenga
Jan 1, 1983·Catheterization and Cardiovascular Diagnosis·E K ShireyR L Greenstreet
Aug 11, 2020·World Journal of Cardiology·Fatima A ShaikXuming Dai
Jan 1, 1982·Catheterization and Cardiovascular Diagnosis·J A HillC J Pepine

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