Fig. 1.

(A) 12-lead electrocardiogram (ECG) of the patient's monomorphic ventricular tachycardia (VT) on presentation. (B) Subsequent paced ECG showing paced QRS-duration (QRSD) of 186 ms. (C) Selective angiography of the mid-lateral branch of the coronary sinus (CS) in the left anterior oblique (LAO) projection, with mechanical tricuspid valve (TV) and mitral valve (MV) visible, along with pre-existing right ventricular (RV) lead. (D) LAO projection of the final position of the implantable cardioverter-defibrillator coil in the mid-lateral branch of CS, with TV and MV visible, along with right ventricular (RV) lead and old epicardial leads. (E) Bi-ventricular pacing at follow-up with QRSD 142 ms.