Abstract
Catheter radiofrequency ablation of the atrial fibrillation substrate may be difficult in patients after open heart surgery. Difficulties may arise in the presence of a mitral valve prosthesis, atrial arrhythmias of several morphologies (more often left atrial atypical flutter), including incisional ones. These cases require a thorough and scrupulous approach to achieve complete isolation of all available arrhythmia substrates. A distinctive feature of this observation is the successful simultaneous pulmonary vein isolation and two atrial arrhythmias in a patient with a mechanical mitral prosthesis.
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