Postinfarction conduction abnormalities

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Raviteja Guddeti, M.B.B.S. [2]

Overview

Ischemia of the conduction system results in conduction abnormalities in the heart. Atrioventricular blocks are common in inferior infarcts and intraventricular blocks are common in anterior wall infarcts.

Classification

Conduction abnormalities post-infarction can be classified as atrioventricular blocks and intraventricular blocks.

• Atriventricular blocks:
  • Second degree blocks (Mobitz type I and II)
  • Third degree

• Intraventricular block:
  • Bundle branch blocks
  • Bifascicular blocks

These blocks can be temporary or persistent.

Pathophysiology

Atrioventricular blocks

• High grade AV blocks (second and third degree blocks) occur in up to 20% of patients with inferior MI.