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Figure 1 Schematic representation of the placement of the epicardial markers and intracardiac ultrasound interrogation plane. A and B = epicardial markers; AO = aorta; bc = percutaneous transluminal coronary angioplasty balloon catheter; ICE = intracardiac ultrasound catheter; LA = left atrium; LV = left ventricle; RV = right ventricle.