This man had a blocked left coronary artery, as shown in Fig. 3.114B.
It is important to know which coronary artery is blocked.
The left coronary artery supplies the majority of the left side of the heart. The left main stem vessel is approximately 2 cm long and divides into the circumflex artery, which lies between the atrium and the ventricle in the coronary sulcus, and the anterior interventricular artery, which is often referred to as the left anterior descending artery (LAD).