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Related Experiment Videos

Second-degree atrioventricular block: a reappraisal.

S S Barold1, D L Hayes

  • 1Electrophysiology Institute, Broward General Hospital, Ft Lauderdale, Fla., USA. ssbarold@aol.com

Mayo Clinic Proceedings
|January 13, 2001
PubMed
Summary

Second-degree atrioventricular (AV) block types I and II are often misunderstood. Clear diagnostic criteria are essential for accurate identification and appropriate clinical management of AV block.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Second-degree atrioventricular (AV) block, encompassing Type I and Type II, involves impaired conduction from the atria to the ventricles.
  • The precise classification and understanding of these blocks, particularly Type II, remain challenging due to varied diagnostic criteria and mimicking conditions.

Purpose of the Study:

  • To review the diverse forms and etiologies of second-degree AV block.
  • To elucidate the reasons behind the persistent lack of understanding surrounding these conditions.
  • To emphasize the importance of adhering to precise definitions for accurate diagnosis and management.

Main Methods:

  • Review of existing literature on second-degree AV block.
  • Analysis of diagnostic criteria for Type I and Type II AV block.
  • Discussion of electrocardiographic patterns and differentiating features.

Main Results:

  • Type I AV block is characterized by variable AV conduction, while Type II presents as an apparent all-or-none phenomenon.
  • Accurate diagnosis of Type II block requires careful consideration of sinus rate, PR intervals, and absence of specific patterns.
  • Pseudo-AV block can arise from concealed His bundle or ventricular extrasystoles, mimicking true AV block.

Conclusions:

  • Infranodal blocks, including all correctly defined Type II blocks, necessitate pacing irrespective of symptoms.
  • A 2:1 AV block can be nodal or infranodal but cannot be classified as Type I or Type II.
  • Standardized definitions are crucial for simplifying the clinical evaluation and management of second-degree AV block.

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