Which cardiac disease history findings are characteristic of third-degree atrioventricular (AV) block?

Updated: Jul 05, 2018
  • Author: Akanksha Agrawal, MBBS; Chief Editor: Jeffrey N Rottman, MD  more...
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Answer

Patients who have a history of cardiac disease may be on medications that affect the conduction system through the AV node (AVN), including the following:

  • Beta-blockers

  • Calcium channel blockers

  • Digitalis cardioglycosides

The patient’s history of cardiac interventions should be carefully investigated; aortic valve surgery, septal alcohol ablation, proximal anterior descending artery stenting (complicated by compromised flow in the first septal perforator branch), and ablation of the slow or fast pathway of the AVN all may result in third-degree AV block.


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