Sinoatrial nodal artery
Branch
Arises from the proximal RCA in about 60% and from the proximal circumflex in about 40%, then runs up the right atrium to the SA node at the junction of the superior vena cava and right atrium.
Traced from the start
Detail
- Origin
- RCA 60%, circumflex 40%
- Supplies
- SA node and the surrounding atrial myocardium
When it goes wrong
Occlusion of the RCA proximal to the SA nodal branch
Sinus bradycardia or sinus arrest in inferior MI, compounded by vagal activation (Bezold-Jarisch reflex)
Practise this structure
2 questions in the bank tagged Cardiac Conduction.
A 24-year-old man presents with two hours of palpitations. He is alert, has no chest pain, and his blood pressure is 124/76 mmHg. The radial pulse is regular at…
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A 46-year-old labourer is freed after six hours trapped beneath a collapsed brick wall. Both thighs are tense, swollen and tender, and he cannot move his toes.…
Foundations · middle twist