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Mahaim tachycardias

E Aliot1, C de Chillou, G Revault d'Allones

  • 1Service de Cardiologie, Hôpital Central, Nancy, France.

European Heart Journal
|August 26, 1998
PubMed
Summary
This summary is machine-generated.

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Mahaim fibres cause pre-excitation syndromes with a distinct left bundle branch block pattern. Catheter ablation offers a definitive therapy for Mahaim fibres tachycardia with high success rates and minimal morbidity.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Mahaim fibres represent a rare (less than 3%) subgroup of pre-excitation syndromes.
  • These fibres are characterized by episodes of pre-excitation during sinus rhythm, classified as nodoventricular or fasciculoventricular.

Purpose of the Study:

  • To elucidate the substrate and characteristics of Mahaim fibres tachycardia.
  • To identify diagnostic electrocardiogram (ECG) features suggestive of Mahaim tachycardia.
  • To review therapeutic options for Mahaim fibres tachycardia.

Main Methods:

  • Analysis of electrophysiological properties of accessory pathways (APs) associated with Mahaim fibres.
  • Review of ECG criteria for diagnosing Mahaim tachycardia.
  • Evaluation of clinical findings, including associated cardiac anomalies and treatment outcomes.

Related Experiment Videos

Main Results:

  • Mahaim fibres tachycardia originates from slowly conducting atrioventricular accessory pathways with decremental properties.
  • The tachycardia presents with a left bundle branch block (LBBB) pattern, prolonged AV interval, and short VA interval.
  • Specific ECG features include superior or 0-75 degree QRS axis, QRS duration ≤0.15s, and precordial transition at or after V4.
  • Ebstein's anomaly and multiple APs are observed with increased frequency.

Conclusions:

  • Catheter ablation is a highly successful and minimally morbid definitive therapy for Mahaim fibres tachycardia.
  • Pharmacological options including Class IA, IC antiarrhythmic drugs, and beta-blockers may be effective in preventing tachycardia episodes.
  • Surgical interventions have also shown excellent results for accessory atrioventricular connections and Mahaim fibres tachycardia.