Segmental Conduction Block in a Low-Voltage Area Suppressed Macro-Reentrant Ventricular Tachycardia after Surgical Repair of Tetralogy of Fallot

Masaomi Chinushi, Satoru Komura, Hiroshi Furushima, Yoshifusa Aizawa
2009 Internal medicine (Tokyo. 1992)  
Macro-reentrant ventricular tachycardia (VT) developed in a 20 -year-old man, 17 years after surgical repair of tetralogy of Fallot. Activation mapping of the VT revealed its counterclockwise propagation around the right ventricle, and through a critical pathway between a transannular patch and the tricuspid annulus. This critical pathway was 6 cm long and contained myocardium with a normal amplitude, while the area of low voltage was limited adjacent to the transannular patch. A linear lesion
more » ... as created by radiofrequency energy delivered only to the low voltage area. After ablation, the activation wavefront through the low voltage area was blocked, and VT became non-inducible.
doi:10.2169/internalmedicine.48.2048 pmid:19525591 fatcat:3vpwa6psw5bqlo6anw26hk6sdy