What is the expected heart-rate response when a patient is taking a drug that is an adrenaline antagonist?
A)Heart rate is unchanged.
B)Heart rate decreases.
C)Heart rate increases.
D)Heart rate is irregular.

Question

Quizplus · Accepted Answer

Adrenaline (epinephrine) is made in the body and normally binds to heart receptors and increases the heart rate. A drug that is an adrenaline antagonist binds to heart cell receptors nonfunctionally and blocks naturally occurring adrenaline from binding to these cells. As a result, heart rate decreases (and often becomes more regular).

What Is the Expected Heart-Rate Response When a Patient Is