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Keywords:

  • atrial flutter;
  • atrioventricular node;
  • AV block;
  • cardiomyopathy;
  • catheter ablation;
  • pacemaker

Intra-Atrial Conduction Block. A 42-year-old woman with a history of cardiomyopathy and multiple ablation procedures for atrial tachycardia developed intra-atrial conduction block that mimicked atrioventricular (AV) nodal block during radiofrequency ablation at the cavotricuspid isthmus. She was treated with atrial pacing (from the coronary sinus), which overcame intra-atrial conduction block and resulted in AV nodal conduction. (J Cardiovasc Electrophysiol, Vol. 23, pp. 1258–1261, November 2012)