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Figure 2 (A) Shown are simultaneous recordings from surface lead II, Rove catheter records from the left septum, His bundle recording, and distal coronary sinus (CS)1,2 and proximal CS3,4 recordings. The earliest activation site in the left septum was 30 ms before the onset of the surface P-wave. (B) Application of radiofrequency energy to the earliest left septal site during tachycardia results in acceleration before return of sinus rhythm.
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