A nurse is reviewing the phenomenon of reflex tachycardia with a group of nursing students. Which statement by a student indicates understanding of this phenomenon?
a. "Baroreceptors in the aortic arch stimulate the heart to beat faster."
b. "Reflex tachycardia can negate the desired effects of vasodilators."
c. "Reflex tachycardia is more likely to occur when beta blockers are given."
d. "Venous dilation must occur for reflex tachycardia to occur."
ANS: B
Reflex tachycardia, which is a compensatory mechanism in response to decreased blood pressure, can negate the desired effect of a vasodilator by eventually increasing blood pressure. Baroreceptors relay information to the vasomotor center of the medulla; the medulla sends impulses to the heart. Beta blockers are given to counter reflex tachycardia. Reflex tachycardia can be produced by dilation of both arterioles and veins.
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