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Conduction abnormalities in the His-Purkinje tissue

  • Fred M. Kusumoto
Chapter

Abstract

The ventricles are activated by the left and right bundles and the Purkinje system. The rapid conduction velocity of these specialized myocytes leads to almost simultaneous activation of the entire myocardium, which in turn leads to a narrow QRS complex recorded by the ECG (usually less than 0.10 s). However, abnormalities of the bundles will lead to sequential activation of the ventricles that in turn will cause a wide QRS complex. The left bundle is composed of two major divisions: anterior and posterior. Abnormal conduction in one of these divisions or fascicles of the left bundle will not necessarily lead to a wide QRS complex but will cause characteristic QRS patterns on the ECG. The recognition of different types of conduction abnormalities in the bundle branches and fascicles will be the subject of this chapter.

Keywords

Left Bundle Branch Block Right Bundle Branch Block Ventricular Activation Lead Versus Organic Heart Disease 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Department of MedicineMayo ClinicJacksonvilleUSA

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