Slow pathway ablation in common AVNRT can be complicated by total @entity713 . When radiofrequency energy is delivered to the posterior aspect of the triangle of Koch, total @entity713 may be the consequence of the absence of anterograde conduction along the fast pathway or of inadvertent damage to a fast pathway abnormally located close to the slow pathway. To localize the anterogradely conducting fast pathway, the triangle of Koch was pacemapped in 72 @entity1 who underwent the ablation of common AVNRT. In all cases, before ablation the St-H interval was calculated by stimulating the @entity18564 ( @entity18564 ), @entity9009 ( @entity9009 ), and posteroseptal (PS) aspect of the triangle of Koch at a rate slightly faster than the sinus rate. In all @entity1 , common AVNRT was induced. In 64 (89%) of 72 @entity1 (group A) the shortest St-H interval was recorded on stimulating the @entity18564 region. In six (8%) @entity1 (group B) the shortest St-H interval was recorded on stimulating the @entity9009 region. Finally, in two (3%) @entity1 (group C) the shortest St-H interval was recorded stimulating in the PS region. In group C, AH interval, calculated on stimulating in the @entity18564 region, was significantly longer than in @entity1 of groups A and B (200 +/- 99 ms vs 64 +/- 18 and 62 +/- 3, respectively). In group A, on stimulating in the @entity18564 , @entity9009 , and PS regions, the AH interval remained constant in all @entity1 . In contrast, in groups B and C on stimulation in the @entity9009 and PS regions, AH interval shortened (in group B from 56 +/- 8 to 27 +/- 37 and 37 +/- 14, respectively; in group C from 200 +/- 99 to 170 +/- 100 and to 137 +/- 109, respectively). In groups A and B, a posteroseptal slow pathway, and in group C, an @entity18564 retrograde fast pathway were successfully ablated without @entity713 . Pacemapping of the triangle of Koch can help to recognize @entity1 in whom the anterograde conducting fast pathway is abnormally located far from the @entity18564 region or in whom anterograde conduction of the fast pathway is absent. In these cases the risk of @entity713 can be reduced by performing slow pathway ablation in a site sufficiently far from the site of the anterograde fast pathway or ablating the retrogradely conducting fast pathway.

Pacemapping of the triangle of Koch: a simple method to reduce the risk of XXXX during radiofrequency ablation of @entity713 reentrant tachycardia.

@entity713 :: ('MESH:D054537', 'Disease') :: ['AV block'] @entity1 :: ('9606', 'Species') :: ['patients'] @entity9009 :: ('MESH:D018658', 'Disease') :: ['mid-septal', 'MS'] @entity18564 :: ('MESH:D056988', 'Disease') :: ['anteroseptal', 'AS']
@entity713 :: (MESH:D054537,Disease) :: ['atrioventricular block']
