Figure 6.

Pacing from the protected isthmus of a VT circuit. Entrainment mapping during VT. The VT CL is 620 ms, and pacing is performed at a CL of 580 ms. A low‐voltage electrogram is located in diastole on the recordings of the ablation catheter (Map). The stimulus‐QRS interval is 230 ms and matches with the electrogram‐QRS interval. The postpacing interval is equal to the VT CL. The stimulus‐QRS/VT CL ratio is 0.37, indicating that the catheter is located in the common pathway. Abbreviations: CL, cycle length; PPI, postpacing interval; VT, ventricular tachycardia