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CARDIAC ECGS > ECG: Left Anterior Fascicular Block > Flashcards

ECG: Left Anterior Fascicular Block Flashcards

1
Q

A left anterior fascicular block (LAFB, a.k.a. left anterior hemiblock or LAHB) occurs when¿

A

The anterior fascicle of the left bundle branch is no longer able to conduct action potentials.

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2
Q

What is the criteria to diagnose a LAFB¿

A
  1. Left axis deviation of at least -45 degrees
  2. The presence of a qR complex in lead I and a rS complex in lead III.
  3. Usually a rS complex in lead II and aVF as well (not always).
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3
Q

Why is old inferior wall myocardial infarction is not able to be diagnosed in the setting of a left anterior fascicular block¿

A

Due to the inferior Q waves present from the LAFB.

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4
Q

Can a LAFB occur in the setting of a bifascicular or trifascicular block¿

A

Yes

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CARDIAC ECGS (7 decks)

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