Long conduction time from the anterior left atrium to coronary sinus during entrainment pacing of a bi‐atrial tachycardia: What is the mechanism?

The article describes the case of a 79-year-old man with ischemic heart disease who underwent catheter ablation of persistent atrial tachycardia (AT). The man received a pulmonary vein isolation, left atrial (LA) posterior wall isolation, and lateral mitral isthmus linear ablation of atrial fibrillation and AT. Also discussed are the earliest activation site in the LA and the need of physicians to pay attention when using AT entertainment pacing in macro-reentrant tachycardias.