This image was obtained via a left anterior oblique view (almost as thought you were looking "down the barrel" of the heart) in order to view the right coronary artery as it courses along the outside of the atrioventricular groove on the right. Because of the angle, the posterior interventricular artery branch will look significantly foreshortened.

Identify the following:

1. angiogram catheter

2. right coronary artery

3. branch to sinoatrial node

4. posterior interventricular artery