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Figure 2 Mixed lead system in a patient after the Senning procedure for transposition of great arteries (Patient #4) (Table 1). Two pre-existing unipolar ventricular leads (one is abandoned) are implanted transvenously at left ventricular mid-septum (LV). A bipolar epicardial lead is placed through the thoracotomy at the right ventricular free wall (RV) with good spatial separation of the RV and LV leads across the right ventricle. Presumed position of the tricuspid annulus is indicated. LAO = left anterior oblique projection; RA = right atrial lead; RAO = right anterior oblique projection.
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