Ramus nodi sinuatrialis
Fistula
Between Right Coronary Artery and Left Atrium via Sinoatrial Artery: A Rare Entity. Cardiac CT angiography volume-rendered image shows sinoatrial artery which is a branch of right coronary artery (RCA) and fistulates to the left atrium.
Fistula
Between Right Coronary Artery and Left Atrium via Sinoatrial Artery: A Rare Entity. Cardiac CT angiography maximum intensity projection image shows sinoatrial artery which is a branch of right coronary artery (RCA), fistulates to the left atrium.
The sinoatrial (SA) nodal artery is the small artery that supplies the sinoatrial (SA) node of the heart (the pacemaker).
Gross anatomy
Origin
Right coronary artery in 60% of cases and the left coronary artery in 40% of cases.
Course
The artery turns posteriorly below the superior vena caval opening.
Variant anatomy
The SA node can arise from its own opening in the anterior aortic sinus.
A study of 516 SA nodal arteries using MDCT found 96.4% of arteries were single whilst 3.6% were double. In this study only 53.4% of SA nodal arteries originated from the right coronary artery with 43% originating from the left circumflex artery.
Other variants include
- S-shaped variant
Siehe auch:
Assoziationen und Differentialdiagnosen zu Ramus nodi sinuatrialis: