A patient has sustained damage to the sinoatrial node. Which heart rates indicate that the patient's atrioventricular node has taken over as the pacemaker for the heart?
a. 10 to 20
b. 20 to 35
c. 40 to 60
d. 80 to 100
ANS: C
If the sinoatrial (SA) node becomes nonfunctional, the atrioventricular (AV) node can initiate each heartbeat, but at a slower rate of 40 to 60 beats per minute. B. The Bundle of His can generate a heartbeat at the rate of 20 to 35. A. No cardiac tissue will generate this speed of heartbeat. D. This is a normal heartbeat which would be generated by the sinoatrial node.
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