A client's heart rate and rhythm are sinus bradycardia at 45 beats/minute. Alteration of function in which of the cardiac conduction system structures can cause this rate and rhythm?
A. Sinoatrial (SA) node
B. Bachmann's bundle
C. Bundle of His
D. Purkinje fibers
A
The SA node is composed of pacemaker cells that normally initiate electrical impulses at a rate of 60 to 100/minute. Altered function of the SA node may result in slow or rapid heart rates.
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