title: Ventricular tachycardia with alternate ventriculo-atrial Wenckebach conduction due to two-level block.
abstract: A 54-year-old patient was studied because of ventricular tachycardia following an inferior myocardial infarction. During one episode of non-sustained ventricular tachycardia a 9:4 alternating ventriculo-atrial Wenckebach block was noted. This was based upon a 2:1 block between the ventricles and the bundle of His and a 5:4 Wenckebach block between the bundle of His and the atria. Our study shows that alternate Wenckebach periods during ventriculo-atrial conduction may be caused by two or more levels of block in the ventriculo-atrial conduction system.
mesh_terms: D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004594:Electrophysiology; D006327:Heart Block / Q000150:complications*; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications; D013610:Tachycardia / Q000209:etiology*