Evaluation of LV lead position. Six months follow-up cardiac CT acquisition from the same patient as in Figure 4. In the mid-LV short axis view, the LV lead is positioned in the left marginal vein draining the lateral LV wall (left). In the four-chamber view, the LV lead tip is positioned in the lateral mid-LV segment (right). LA, left atrium; LAD, left anterior descending artery; LMA, left marginal artery (circumflex artery branch); MCV, middle cardiac vein; PDA, posterior descending artery (right coronary artery branch); RA, right atrium; RV, right ventricle).