Why do many patients with very high heart rates frequently have chest pain and shortness of breath?
a. Patients with heart disease frequently have an anxiety disorder as well.
b. The rapid pounding of the heart in the chest wall causes the physical pain.
c. The heart muscle gets tired from the increased work.
d. The decreased diastolic time decreases oxygen delivery to the myocardium.
D
The coronary arteries are perfused during diastole. When the heart rate increases, the diastolic time decreases as each contraction has less time to be completed. This decreases the time the coronary arteries have to deliver oxygenated blood to the myocardium. The symptoms described are caused by a lack of oxygen in the myocardium.
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