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

A beta₁-adrenergic agonist activates the beta₁-adrenergic receptors, which are primarily located in the heart. This leads to an increase in heart rate and contractility, resulting in a positive inotropic effect. In the case of heart failure, the drug is given to improve cardiac output and improve symptoms.

A Patient in Heart Failure Is Given a Drug That