The physical therapist notifies the nurse that a patient with coronary artery disease (CAD) experiences a much greater-than-average increase in heart rate during physical therapy
The nurse recognizes that an increase in heart rate in a patient with CAD may result in what?
A) Development of an atrial-septal defect
B) Myocardial ischemia
C) Formation of a pulmonary embolism
D) Release of potassium ions from cardiac cells
Ans: B
Feedback:
Unlike other arteries, the coronary arteries are perfused during diastole. An increase in heart rate shortens diastole and can decrease myocardial perfusion. Patients, particularly those with CAD, can develop myocardial ischemia. An increase in heart rate will not usually result in a pulmonary embolism or create electrolyte imbalances. Atrial-septal defects are congenital.
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