Coronary angiogram levophase
Coronary angiogram levophase showing the catheter engaged in the left main coronary artery (artery not visible as it is the levophase). Levophase angiogram is a delayed recording after contrast injection into the coronary artery. After filling the coronary arteries, the contrast drains into the coronary venous system, finally opacifying the coronary sinus, which drains into the right atrium. To get better visualization of the coronary sinus and its tributaries, a balloon occlusion angiography of the coronary sinus is done by cannulating it retrogradely from the right atrium. Visualization of coronary sinus and its tributaries are needed for placing the left ventricular lead in cardiac resynchronization therapy. A posterolateral vein is selected for left ventricular pacing in cardiac resynchronization therapy (CRT) for heart failure with wide QRS suggesting dyssynchrony.