Accessory pathway with two conduction times.
A 48-year old man was referred for frequent paroxysmal narrow QRS tachycardias. Either a rapid orthodromic tachycardia (220 b/min) using a fast-conducting left lateral concealed atrioventricular (AV) accessory pathway (AP) for its retrograde conduction or a slow orthodromic tachycardia (125 b/min) using the same concealed AP which was slow-conducting, were induced. One application of radiofrequency energy at the earliest site of retrograde conduction suppressed both forms of tachycardias. Reciprocating tachycardias presenting with different retrograde conduction times were related to a single reentrant circuit.
Brembilla-Perrot
Béatrice
B
Cardiology, CHU of Brabois, 54500 Vandoeuvre les Nancy, France. b.brembilla-perrot@chu.nancy.tr
Houriez
Pierre
P
Beurrier
Daniel
D
Behr
Bernard
B
D017115:Catheter Ablation; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology / Q000601:surgery; D006329:Heart Conduction System / Q000503:physiopathology* / Q000601:surgery; D006352:Heart Ventricles / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology* / Q000601:surgery