Key result
A rare anatomical variation was identified where the sinoatrial nodal artery originated from the right coronary artery at the level of the inferior border of the heart and followed an unusual course.
Why the study?
Although variations in the origin and course of the sinoatrial nodal artery have been reported, the authors sought to describe a rare variation in its origin, course, and relations.
Case Report (n=1)
No
Identification of a rare anatomical variation of the sinoatrial nodal artery originating from the inferior border of the heart provides important anatomical knowledge for cardiac interventions.
Purpose Several previous studies reported variations in the origin and course of the sinoatrial nodal artery (SANa). In the present report, we describe a rare variation in the origin, course and relations of the SANa. Methods The case herein described was found during a routine dissection performed on a formalin-embalmed human adult male cadaver (82 years old). Results During the dissection, we identified the SANa originating from the right coronary artery (RCA) at the level of the inferior border (acute margin) of the heart and coursing upward. The initial part of this vessel is tortuous, and then it follows a straight path parallel to the RCA along the anterior surface of the right atrium. After this part, the artery curves posteriorly and to the left until it reaches the lower border of the right auricle, where it closely approaches the RCA. Finally, the artery runs posteriorly and to the right to follow a course along the medial wall of the right auricle and right atrium to reach a location close to the region of the junction of the superior vena cava and right atrium where it follows its path buried in the myocardium. We also characterized the artery radiologically through the injection of a contrast medium into the RCA and in the SANa. Conclusion The knowledge of the anatomical variations of the SANa is of the utmost importance for cardiologists and heart surgeons in order to better understand cardiac disease and accurately plan and execute cardiac interventions and surgical procedures.
No takes yet. Share an insight, caveat, or question.
Madeira et al. (2023) conducted a case report in Anatomical variation of the sinoatrial nodal artery (n=1). Anatomical variation of the sinoatrial nodal artery was evaluated on Origin, course, and relations of the sinoatrial nodal artery. A rare anatomical variation was identified where the sinoatrial nodal artery originated from the right coronary artery at the level of the inferior border of the heart and followed an unusual course.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: