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[Preferential projections for mapping and ablation of tachycardia of the right ventricle outflow. Anatomoradiological
N Mehta1, A A de Paola, A Mendonça
1Escola Paulista de Medicina, UNIFESP, São Paulo.
Purpose:
To select ideal radiologic projections for mapping and ablation of tachycardias of right ventricular outflow tract (RVOT).
Methods:
Ten hearts from human corpses were studied utilizing radiopaque material to identify the pulmonary valve and three distinct sites on this valve: septal anterior (A), septal posterior (P) and free-wall (L). Next, the hearts were filmed in the frontal plane and in oblique projections with 15 degrees increments to the right and to the left. The projections in which the sites were lateralized on the valve, eased radiologic interpretation and were considered ideal for mapping and ablation. Depending on the proximity of the sites to the lateral extremes of the pulmonary valve, the projections were considered ideal ( ), intermediary (++) and inadequate (+).
Results:
Projections [table: see text]
Conclusion:
The A site of RVOT was best indicated in the 60 and 45 degrees left anterior oblique projections; the 0 degree postero anterior projection was best for mapping the P site; the L region was best explored in the 60 degrees right anterior oblique projection.