A left posterior fascicular block ― also known as a left posterior hemiblock, LPHB ― occurs on the ECG when the posterior fascicle of the left bundle branch is no longer able to conduct action ...
Note: The pattern of a LPFB sometimes appears similar to the S1Q3T3 pattern sometimes present in a patient with an acute pulmonary embolism. This ECG finding is termed the McGinn-White sign.
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