The critical care nurse is caring for a client with bradycardia after cardiovascular surgery. The nurse knows that the heart rate is determined by myocardial cells with the fastest inherent firing rate
Under normal circumstances where are these cells located?
A) SA node
B) AV node
C) Bundle of HIS
D) Purkinje cells
Ans: A
Feedback: The heart rate is determined by the myocardial cells with the fastest inherent firing rate. Under normal circumstances, the SA node has the highest inherent rate (60 to 100 impulses per minute). Therefore Options B, C, and D are incorrect.
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