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I first had an intuition that the entry location is near sinus node, but now I am thinking that the location is near AV node, at least for some myocardial infarction patients. Physically, it is a more central location than SA node. I am not convinced that we need to have many entry places for autonomic stimuli.

I have not studied the location of entry of autonomic stimuli for a healthy patient. It can be in the right atrium of the heart. However, I have no evidence. Also, I am not convinced that we need a direct connection from the brain to the SA node.

What is the entry of autonomic stimuli into the heart?

  • in a healthy adult patient
  • in a myocardial infarction patient with SA node damaged
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