Left Posterior Fascicular Block
February 15th, 2021
Overview
Left posterior fascicular block occurs due to failure of conduction down the left posterior fascicle.
Look For
- Right axis deviation 90° to 180° in the absence of other causes
- Normal QRS duration <120ms
- rS pattern in I and aVL: small R wave with large S wave
- qR pattern in III and aVF
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