A patient in heart failure is given a drug that is classified as a beta₁-adrenergic agonist.The drug
A) blocks the beta1-adrenergic receptors and causes a (-) chronotropic and (-) inotropic effect.
B) activates the beta1-adrenergic receptors and causes bronchoconstriction.
C) activates the beta1-adrenergic receptors and causes a (+) inotropic effect.
D) activates the vagus nerve, thereby slowing heart rate and strengthening myocardial contraction.

Question

Quizplus · Accepted Answer

Beta₁-adrenergic agonists activate beta1-adrenergic receptors in the heart, which causes an increase in heart rate and contractility (positive inotropic effect). This can be helpful in treating heart failure by improving cardiac output.

A Patient in Heart Failure Is Given a Drug That