Definition of the location of DGCV-AIV origin
The DGCV-AIV origin of VAs was identified by mapping and ablation
outcomes combined with retrograde venography of the coronary venous
system. In our study, DGCV-AIV refers to the anatomy in the distal
portion of the great cardiac vein, including four regions, DGCV1, DGCV2,
summit-CV, AIV. DGCV1 is defined
as the segment of DGCV at the epicardium of anterolateral wall of mitral
annulus and DGCV2 as the segment
of DGCV transecting the epicardial LV outflow region bounded by the
bifurcation between the left anterior descending artery and left
circumflex artery, and continued to DGCV1. Anterior interventricular
vein (AIV) refers to the vein going along the anterior interventricular
groove from cardiac apex to bottom, turning posteriorly and continuing
as DGCV2. Summit-CV refers to the communicating vein (CV) between the
aortic and pulmonary annulus, which is the extended tributary of the
DGCV located distal to the origin of the
AIV, see Figure2 .