Post-infarction conduction abnormalities

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Template:Hamid

Overview

Acute myocardial infarction (MI) remains the leading cause of mortality all over the world. Electrical conduction abnormalities commonly complicate acute myocardial infarction, leading to a further rise in long and short term morbidities and mortality rates. Different types of conduction abnormalities can follow MI, with bradyarrhythmias and atrioventricular (AV) block representing the most common. Other post-MI conduction abnormalities include supraventricular arrhythmias and ventricular arrhythmias.

Classification

Bradyarrhythmia:

• Sinus bradycardia

Atrioventricular blocks:

• First degree AV block
• Second degree AV block
• Third degree AV block

Bundle branch blocks:

• Left bundle branch block (LBBB)
• Right bundle branch block (RBBB)
• Right bundle branch block(RBBB) with left anterior fascicular block (LAFB)
• RBBB with left posterior fascicular block (LPFB)
• Alternating bundle branch block
• Bifascicular block plus PR prolongation (trifascicular block)