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. Author manuscript; available in PMC: 2021 Sep 23.
Published in final edited form as: Heart Rhythm. 2019 May 10;17(1):e155–e205. doi: 10.1016/j.hrthm.2019.03.014

Figure 6.

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. CL = cycle length; PPI = postpacing interval; VT = ventricular tachycardia.