Assertion: atropine's effect | /r/AtLocation | the sa node
Facets:
value: in the atria
type: LOCATION
value: primarily
type: DEGREE
Source sentences:
text: Since atropine’s effect is primarily on the SA node in the atria, a 3rd-degree block would prevent its effect on the SA node from influencing the rate of ventricular contraction which is needed to improve perfusion.