Prolonged occlusion of the right coronary artery produces an infarction in which of the following areas of the heart?
A. Anterior
B. Apical
C. Inferior
D. Lateral
Correct Answer: C. Inferior
The right coronary artery supplies the right ventricle or the inferior portion of the heart. Therefore, prolonged occlusion could produce an infarction in that area. The RCA emerges from the anterior ascending aorta and supplies blood primarily to the right atrium, right ventricle. The sinoatrial nodal artery is a branch of the RCA that supplies the SA node.
Option A: The right coronary artery doesn’t supply the anterior portion (left ventricle). The LAD supplies blood to the anterior portion of the left ventricle. Other small branches of the coronary arteries are the obtuse marginal artery (OMA), diagonals, and septal perforator (SP).
Option B: The right coronary artery doesn’t supply the apical portion (left ventricle) of the heart. The LAD is one of two major branches of the LMCA, with the other being the left circumflex (LCx) coronary arteries. Combined, these two supply blood to the left atrium and left ventricle.
Option D: The right coronary artery doesn’t supply the lateral portion (some of the left ventricle and the left atrium). The circumflex artery is responsible for blood supply to the left atrium and the posterior-lateral aspect of the left ventricle. The left anterior descending artery (LAD) supplies the anterior two-thirds of the septum.
No comments:
Post a Comment