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Background:The detail of biatrial activation during sustained atrial fibrillation (AF) has not been investigated until now.Methods:Five dogs with right ventricular pacing‐induced congestive heart failure (CHF)and five normal dogs were included. Biatrial endocardiac mapping was performed using noncontact mapping system.Results:Noncontact mapping of the right atrium (RA) showed CHF dogs had a higher frequency of focal discharge from Bachmann's bundle, sinoatrial region, and crista terminalis. CHF dogs also had a higher frequency of wave break, wave fusion, and reentry. CHF dogs had greater effective refractory period (ERP...
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