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The electrocardiographic diagnosis of intraventricular blocks coexisting with ventricular preexcitation

Pablo A Chiale1, Marcelo V Elizari

  • 1Centro de Arritmias Cardíacas de la Ciudad Autónoma de Buenos Aires, División Cardiología, Hospital JM Ramos Mejía, Buenos Aires, Argentina. pablochiale@gmail.com

Journal of Electrocardiology
|May 8, 2012
PubMed

Insights

Diagnosing intraventricular conduction disturbances with electrocardiography can be challenging when ventricular preexcitation is present. This review highlights key diagnostic clues for identifying bundle-branch block in patients with preexcitation.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Electrocardiographic diagnosis of intraventricular conduction disturbances is often complicated by concurrent ventricular preexcitation.
  • Accessory pathway-mediated premature ventricular depolarization can mask bundle-branch block (BBB) manifestations.

Purpose of the Study:

  • To reexamine data on ventricular preexcitation in patients with intraventricular blocks.
  • To emphasize the importance of thorough electrocardiogram examination for diagnosing this association.

Main Methods:

  • Review of existing literature on preexcitation and intraventricular blocks.
  • Presentation of clinical examples illustrating diagnostic challenges and findings.

Main Results:

  • Several conditions can favor the diagnosis of BBB associated with ventricular preexcitation.
  • These include intermittent preexcitation/BBB, fast AV nodal conduction, slow accessory pathway conduction, and junctional ectopic beats.

Conclusions:

  • Accurate diagnosis of bundle-branch block in the presence of ventricular preexcitation requires careful electrocardiographic analysis.
  • Recognizing specific electrophysiological conditions aids in differentiating these coexisting abnormalities.

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