This is an acute study to test the ability of a custom external device (MAX-SRS) to sense atrial rhythms, determine when AF is present and deliver spatial resynchronization therapy (SRT) to terminate AF.~Patients will have commercially available diagnostic electrophysiologic catheters placed in the coronary sinus and on the heart. The catheters will be connected to the MAX-SRS. If AF is not present, standard pacing measures will be used to induce AF. Once > 1 minute of AF is recorded, the MAX-SRS will be activated to sense the rhythm and deliver SRT pacing to terminate the AF. Up to five SRT deliveries using the same or different SRT algorithms will be attempted. After the first successful termination of AF or after five SRT attempts the study is complete for each patient. Diagnostic catheters will be removed after the conclusion of the SRT pacing study.
Demonstrate initial safety and performance of Spatial Resynchronization Therapy (SRT) in patients with persistent atrial fibrillation.