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All ECG 54

The rhythm is normal sinus at about 90 beats per minute with a normal PR. The QRS duration is about 0.10 sec. The frontal plane axis is about +100° with wide divergence of the initial and terminal vectors in the frontal plane. The initial forces are leftward and superior, the terminal forces are directed rightward and downward. There is an rS pattern in leads I and aVL and qR pattern in leads III and aVF.

The findings are consistent with left posterior fascicular block.

Related Topic Reviews: Left Posterior Fascicular Block, Determining Axis