Why May a "Racing Heart" (170 Bpm)cause Chest Pain

Question

Why may a "racing heart" (170 bpm)cause chest pain?
A) Chemicals produced by the metabolizing cells stimulate the vagal pain receptors.
B) A racing heart decreases diastole, the period when coronary blood flow is maximal.
C) A racing heart decreases the time that the heart spends in systole.
D) Excess waste produced by metabolizing myocardial cells causes microthrombi to accumulate in the coronary arteries.

Accepted Answer

A racing heart decreases diastole, the period when coronary blood flow is maximal. This can lead to inadequate blood flow and oxygen supply to the heart muscles, resulting in chest pain or angina.