Blood Supply
In the majority of individuals, the SA node receives blood from the right coronary artery, meaning that a myocardial infarction occluding it will cause ischaemia in the SA node unless there is a sufficiently good anastomosis from the left coronary artery. If not, death of the affected cells will stop the SA node from triggering the heartbeat, and pacemaker function will be manifest more distal in the cardiac system (e.g. AV node).
Read more about this topic: Sinoatrial Node
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