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IJAR.2016.482

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Type of Article:  Original Research

Volume 5; Issue 1 (January 2017)

Page No.: 3372-3378

DOI: https://dx.doi.org/10.16965/ijar.2016.482

INTERESTING OBSERVATIONS ON SINOATRIAL NODAL ARTERY: A CLINICAL PERSPECTIVE

Vidyashambhava Pare *1, Roopa Kulkarni 2, Sheela G. Nayak 3.

*1 Professor and Head, Department of Anatomy, K.V.G. Medical College and Hospital, Kurunjibagh, Sullia – Dakshina Kannada, India.

2 Principal and Professor of Anatomy, K.V.G. Medical College and Hospital, Kurunjibagh, Sullia – Dakshina Kannada, India.

3 Dean (Academics), K.V.G. Medical College and Hospital, Kurunjibagh, Sullia – Dakshina Kannada, India.

Address for correspondence: Dr. V.S. Pare, Professor & Head of the Department of Anatomy, K.V.G. Medical College & Hospital, Kurunjibagh, Sullia – Dakshina Kannada, India PIN: 574327 Telephone numbers: Office: 08257   232608 Mobile: 9448460498, 9901730398. E-mail: vs_pare@yahoo.co.in

ABSTRACT:

Introduction: The knowledge of anatomy of coronary arteries and their branches is a self-evident pre-requisite for better understanding of coronary artery disease or for more intelligent planning of surgery. The anatomy of sinoatrial node and its blood supply play an important role in the normal activity of the heart. The sinoatrial nodal artery has variations in origin, course and collaterals. The angle that the artery makes with its parent artery at its origin is clinically important as this angle interferes with the circulation and nourishment. Materials and Methods: Sixty hearts obtained from the Department of Anatomy, Mysore Medical College, Mysore, over the period of two years, were studied by dissection method (37 hearts), corrosion cast (16 hearts) and arteriography (7 hearts).

Observation and Results: The origin, the angle at the origin with parent artery, course in relation to the root of the superior vena cava and demonstrable collaterals or anastomoses of sinoatrial nodal artery were studied. In 57% of hearts the sinoatrial nodal artery arose from right coronary artery, in 25%, from left circumflex artery and in 17% it was given by both right and left coronary arteries. In 1.6% of cases, it was coming from the right aortic sinus close to the right coronary artery origin. In 23% hearts there was acute angle, in 35% it was at right angle and in 48% there was obtuse angle at the site of origin from parent artery. In 50% of hearts the course of sinoatrial nodal artery was anterior, in 39% of hearts it was posterior and in 16% of hearts the course was both anterior and posterior to the root of superior vena cava. These observations could not be made in corrosion casts as the relation with superior vena cava could not be appreciated. The demonstrable collaterals or anastomoses were observed only in two cases.

Conclusion: The sinoatrial nodal artery is the main nourishing channel for the sinoatrial node of the conducting system of heart. The variations in origin, course, the angle it makes with the parent trunk and the collaterals or anastomoses play an important role in functioning of heart. No references were available for the angle of sinoatrial nodal artery at its origin from the parent trunk which is the original work.

KEY WORDS: Sino atrial node, sinoatrial nodal artery, right coronary artery, left circumflex artery, left coronary artery.

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Cite this article: Vidyashambhava Pare, Roopa Kulkarni, Sheela G. Nayak. Interesting observations on sinoatrial nodal artery: A Clinical perspective. Int J Anat Res 2017;5(1):3372-3378. DOI: 10.16965/ijar.2016.482