Artery of the heart The left anterior descending artery (LAD), also called the anterior interventricular artery is a branch of the left coronary artery. It supplies the anterior portion of the left ventricle. It provides about half of the arterial supply to the left ventricle and is thus considered the most important vessel supplying the left ventricle. Blockage of the proximal LAD is often dubbed the "widow-maker" infarction due to its poor prognosis. Wikipedia's most-read article for 2 days in a row: 3,884,170 views in all, peaking at 2,601,855 on October 20, 2016. Wed, Oct 19: 1,282,315 views Thu, Oct 20: 2,601,855 views Wiki link