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IJAR.2017.280

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Type of Article:  Original Research

Volume 5; Issue 3.2 (August 2017)

Page No.: 4182-4186

DOI: https://dx.doi.org/10.16965/ijar.2017.280

VARIATIONS IN THE ORIGIN OF ARTERY TO ATRIOVENTRICULAR NODE

Vidyashambhava Pare *1, Roopa Kulkarni 2.

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

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

Address for Correspondence: Dr. V.S. Pare, Professor & Head of the Department of Anatomy, K.V.G. Medical College & Hospital, Sullia, D.K. , Karnataka, India. Telephone numbers: Office: 08257   232608 Mobile: 9448460498, 9901730398. E-Mail: vs_pare@yahoo.co.in

ABSTRACT:

Introduction: The normal functioning of the conduction system of heart is important and has increased interest in understanding their disorders. The arteries supplying the atrioventricular node have presented variations in origin.  This node is supplied mainly by the branches of right coronary artery and in small number of cases it is supplied by the branches of left coronary artery. The branches of right coronary artery are broadly classified into atrial, ventricular and septal branches. The arterial supply to atrioventricular node is by the first posterior septal branch of the right coronary artery in about 80% of cases. There are inconstant branches of circumflex artery and this artery itself may terminate by supplying the A V node.

Materials and Methods: Sixty human hearts were studied in the Department of Anatomy, Mysore Medical College, Mysore, for two years. They were studied by dissection method (37 hearts), corrosion cast (16 hearts), and arteriography (7 hearts).

Observation: The origin of atrioventricular nodal artery was from an atrial branch of right coronary artery in 06 specimens, ventricular branch of right coronary artery in 02 cases and interventricular septal artery in 04 cases. The atrioventricular nodal artery was seen as a terminal branch of parent artery in 07 cases. In the remaining the atrioventricular nodal artery originated from the coronary arteries directly.

Discussion: The coronary arteries develop in situ and later get connected with the aortic buds. The functional period of the embryo often determines the course of the blood flow and secondary changes. The arteries thus developed, pursue the shortest course to reach their destination. This explains for all known coronary artery anomalies. In the present study, in nineteen cases, the origin was from the atrial, ventricular or septal branches of the right or left coronary artery. Our observations coincided with the observations mentioned in Gray’s anatomy partially.

Conclusion: The atrioventricular nodal artery is the nourishing channel for the atrioventricular node. The variations in the origin of atrioventricular nodal artery from, atrial, ventricular and interventricular septal arteries of right coronary artery are seen in about 19 cases. In the rest, it originated from the trunk of the coronary artery directly. This information would kindle the interest of researchers to further explore the variations in the origin of the atrioventricular nodal artery as there were no other references available.

KEY WORDS: Atrioventricular Nodal Artery, Right Coronary Artery, Left Circumflex Artery, Atrial Branches, Interventricular Septal Branches.

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Cite this article: Vidyashambhava Pare, Roopa Kulkarni. VARIATIONS IN THE ORIGIN OF ARTERY TO ATRIOVENTRICULAR NODE. Int J Anat Res 2017;5(3.2):4182-4186. DOI: 10.16965/ijar.2017.280