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American Journal of the Medical Sciences:
doi: 10.1097/MAJ.0b013e3181907b25
Case Report

Transient Left Bundle Branch Block: An Unusual Electrocardiogram in Acute Pulmonary Embolism

Kasmani, Rahil MD, MRCP; Okoli, Kelechi MD, MRCP; Mohan, Geetali MD; Casey, Kevin DO; Ledrick, David MD, MEd

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Abstract

Pulmonary embolism may result in permanent or transient electrocardiographic abnormalities. New onset left bundle branch block (LBBB) is usually associated with myocardial ischemia. However, nonischemic mechanisms are also known to account for some cases of LBBB. Tachycardia, a common finding in pulmonary embolism, is one such mechanism. This is illustrated by our case, and possible mechanisms for tachycardia-dependent LBBB are discussed. It is important to recognize and interpret the conditions that precipitate it, thereby avoiding inappropriate interventions.

© Copyright 2009 Southern Society for Clinical Investigation

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