A patient is taking a beta-adrenergic antagonist medication for angina pectoris and asks the nurse how the drug works to relieve the discomfort associated with this condition
Which statement by the patient after the nurse's teaching indicates understanding of the drug's effects?
a. "It causes bronchodilation, which increases oxygen flow."
b. "It helps reduce the heart's oxygen needs."
c. "It improves blood flow to the heart."
d. "It increases cardiac output."
ANS: B
Blockade of beta1 receptors in the heart reduces cardiac work by reducing the heart rate, the force of contraction, and the velocity of impulse conduction through the AV node. Beta blockers result in bronchoconstriction, not bronchodilation. They do not increase blood flow to the heart. Cardiac output is decreased, not increased.
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