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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Intra-His bundle block with Wenckebach phenomenon.

Sharath Kumar1, Garry Thomas1, David Newman1

  • 1Sunnybrook Health Sciences Center University of Toronto Toronto Ontario Canada.

Journal of Arrhythmia
|October 8, 2021
PubMed
Summary

This case study reveals Wenckebach atrioventricular (AV) conduction occurring within the His bundle, a rare finding. Electrophysiologic studies confirmed this unusual pattern in a patient with shortness of breath.

Keywords:
AV blockelectrocardiogramintra‐His bundle block

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Conduction System

Background:

  • Atrioventricular (AV) block is a common cardiac condition.
  • Wenckebach (AV) conduction typically occurs at the AV node.
  • His bundle conduction abnormalities are less frequently described.

Purpose of the Study:

  • To report a unique case of Wenckebach conduction within the His bundle.
  • To illustrate the diagnostic findings in a patient with this rare phenomenon.

Main Methods:

  • Case presentation of a 66-year-old female with dyspnea.
  • Electrocardiogram (ECG) demonstrating Wenckebach AV conduction.
  • Electrophysiologic study (EPS) to investigate conduction patterns.

Main Results:

  • ECG showed a Wenckebach atrioventricular (AV) conduction pattern.
  • EPS revealed split-His potentials.
  • Intra-Hisian Wenckebach conduction was identified.

Conclusions:

  • Wenckebach conduction can occur within the His bundle.
  • This finding highlights the complex electrophysiology of the cardiac conduction system.
  • Intra-Hisian Wenckebach is a rare but identifiable conduction abnormality.