Observational Study
Copyright ©The Author(s) 2022.
World J Cardiol. Jun 26, 2022; 14(6): 372-381
Published online Jun 26, 2022. doi: 10.4330/wjc.v14.i6.372
Table 1 Visibility of the coronary veins was classified on the 0-3 point scale
Grade
Visibility
0 Not visible
1 Visible but with discontinuities
2 Visible but with irregular borders
3 Visible with vascular borders perfectly defined