Figure 2
(A) Intracardiac electrogram during ventricular tachycardia with a cycle
length of 325 ms originating from the Para-Hisian region. Prolonged and
fractionated ventricular potentials preceding the QRS onset by 56 ms
were recorded within the noncoronary cusp, corresponding to the opposite
side of the para-Hisian region.
(B) Intracardiac electrogram during ventricular overdrive pacing at a
cycle length of 300 ms from the noncoronary cusp during the ventricular
tachycardia. The arrows indicate the artifact of the pacing stimulus
that was not captured. I, II, V1, V3, V5 = surface electrogram; HRA =
high right atrium; His d and His p = distal and proximal His bundle
region; NCC d and NCC p = distal and proximal noncoronary cusp; RV d and
RV p = distal and proximal right ventricle; S = pacing. The numbers
indicate the cycle lengths in ms.