A-green dotted line = atrioventricular groove; B-green lines = tricuspid valve; C-top green dotted line = LAD (anterior interventricular coronary); D-green outline = right ventricle; E-green outline = right atrial appendage; C bottom green dotted line = diagonal branch off LAD (left anterior interventricular); F left image green dotted line = PDA (posterior interventricular coronary ); F middle image green dotted line = catheter in left main coronary (wire and balloon pass through this catheter into the circumflex coronary artery); F right image green dotted line = diagonal branch off LAD (anterior interventricular coronary artery)