When reviewing the 12-lead electrocardiograph (ECG) for a healthy 79-year-old patient who is having an annual physical examination, what will be of most concern to the nurse?
a. The PR interval is 0.21 seconds.
b. The QRS duration is 0.13 seconds.
c. There is a right bundle-branch block.
d. The heart rate (HR) is 42 beats/minute.
ANS: D
The resting HR does not change with aging, so the decrease in HR requires further investigation. Bundle-branch block and slight increases in PR interval or QRS duration are common in older individuals because of increases in conduction time through the AV node, bundle of His, and bundle branches.
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