Left posterior fascicular block overview

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Left posterior fascicular block is characterized by a mean frontal plane axis of >90° in the absence of other causes of right axis deviation. Left posterior hemiblock (left posterior fascicular block) is infrequent.^[1] Its seen either in the setting of either RCA or LAD related pathologies.

Diagnosis

Electrocardiogram

The electrocardiogram findings in left posterior fascicular block include right axis deviation of the QRS complex, wide QRS complexes and a S1Q3 pattern.

References

↑ ABC of Clinical Electrocardiography, Morris F, Edhouse J, Brady WJ, Camm J, 2003

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[1] ABC of Clinical Electrocardiography, Morris F, Edhouse J, Brady WJ, Camm J, 2003

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