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Related Concept Videos

Conduction System of the Heart01:20

Conduction System of the Heart

933
The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
933

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Updated: Jun 21, 2025

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
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Atrial Septal Defect (ASD) Repair Unveiling an Unusual Conduction Conundrum: A Wenckebach Case Report.

Matthew J Van Ligten1, Douglas E Rappaport2, Lauren B Querin2

  • 1Emergency Medicine, Mayo Clinic Alix School of Medicine, Scottsdale, USA.

Cureus
|July 12, 2024
PubMed
Summary

Atrial septal defects (ASDs) increase stroke risk. A rare case shows a patient developing Mobitz type 1 heart block after a less invasive percutaneous ASD closure, highlighting potential complications.

Keywords:
arrhythmiaatrial septal defect (asd)av blockcardiologycongenital heart diseaseeisenmenger syndromemobitz type 1 wenckebachpercutaneous interventionpulmonary hypertensionstroke risk

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Area of Science:

  • Cardiology
  • Congenital Heart Disease
  • Electrophysiology

Background:

  • Atrial septal defects (ASDs) are common congenital heart anomalies.
  • Untreated ASDs can lead to stroke and pulmonary hypertension.
  • Percutaneous intervention offers a safer alternative to surgical repair for ASDs.

Observation:

  • A patient with a congenital atrial septal defect underwent percutaneous intervention.
  • Following the procedure, the patient developed a new-onset second-degree atrioventricular (AV) block.
  • The specific rhythm identified was Mobitz type 1 (Wenckebach).

Findings:

  • Percutaneous closure of ASDs, while generally safe, can precipitate adverse cardiac events.
  • New-onset Mobitz type 1 AV block is a potential complication following percutaneous ASD intervention.
  • This case highlights an uncommon but significant electrophysiological disturbance post-procedure.

Implications:

  • Awareness of potential cardiac rhythm complications is crucial for clinicians managing patients post-percutaneous ASD intervention.
  • Monitoring for bradyarrhythmias, including AV block, is important in the follow-up care of these patients.
  • Further research may elucidate the mechanisms and optimal management strategies for post-procedural AV block in ASD patients.