CONCLUSION
Perimitral, roof-dependent, and CTI-dependent flutters can mimic a focal
AT with centrifugal propagation. These pseudo-focal ATs result from
endocardial scarring at distinct anatomical areas, which favors masked
conduction via protected epicardial bundles. Blocking the anatomical
isthmus of these well-defined flutters is more efficient than ablating
the breakthrough site. Thus, comprehensive entrainment pacing maneuvers
are crucial for the correct diagnosis of the macroreentrant mechanism
and opt for an adequate ablation strategy.