Which coronary artery stenosis is likely responsible for hypokinesis of the posterior left ventricle in this patient?

In the context of cardiac blood supply, the posterior part of the left ventricle is primarily supplied by the right coronary artery (RCA) in the majority of individuals, especially right-dominant coronary systems. The RCA typically gives rise to the posterior descending artery (PDA), which supplies the inferior wall of the left ventricle.

When there is stenosis or blockage in the right coronary artery, it can lead to decreased blood flow to the areas supplied by its branches, including the PDA. This reduction in blood flow can result in hypokinesis of the posterior left ventricle, as the affected myocardial tissue becomes ischemic and unable to contract effectively.

In contrast, the left coronary artery and its branches, such as the left anterior descending artery and the left circumflex artery, primarily supply the anterior and lateral walls of the left ventricle. Stenosis in these arteries would more likely impact those regions, not the posterior wall.

Therefore, in this scenario, the right coronary artery stenosis is directly associated with the hypokinesis of the posterior left ventricle due to the specific areas it supplies.