Dita Aulia Rachmi, - and Rina Yudha Novira, - and Eka Prasetya Budi Mulia, - and Andrianto, - (2021) Paradoxical heart rate response after atropine sulfate administration in total atrioventricular block complicating acute myocardial infarction: A case report. Bali Journal of Anesthesiology, 5 (4). pp. 271-274. ISSN 2549-2278

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Abstract

Acute myocardial infarction is sometimes complicated by atrioventricular block. Advanced cardiac life support guideline for the treatment of atrioventricular block suggests early use of atropine. Atropine works as a parasympatholytic drug that enhances SA node automaticity and AV node conduction. We report a case of a male patient with inferior myocardial infarction and total atrioventricular block who showed a marked reduction in heart rate after first and second atropine administration, a paradoxical worsening of the block. Atropine has been associated with some adverse consequences, including proarrhythmic effect, worsening of the high-grade atrioventricular block, and worsening of the ischemic situation. In this case of total atrioventricular block caused by acute myocardial infarction, immediate revascularization can be the only required management. Awareness of this potential adverse reaction will help the clinician make a risk/benefit ratio consideration regarding the use of atropine for certain patients.

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