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Electrogram showing concealed entrainment with an S‐QRS/VTCL ratio of 40% observed at the slow conduction area. This finding confirms the site of slow conduction within the reentry circuit (central isthmus). CS, coronary sinus; HDG, HD grid; PCL, pacing cycle length; PPI, post‐pacing interval; S‐QRS, stimulus‐QRS time; VTCL, ventricular tachycardia cycle length.
