Pharmacology Vasopressors #3

Question

Which is the best explanation from the nurse about how dopamine functions in the body?

Answers

  1. Dopamine decreases cardiac output through stimulation of beta receptors.
    • Rationale:

      This answer is not correct because dopamine functions to increase cardiac output through stimulation of alpha and beta receptors. Dopamine is often used to treat acute kidney failure associated with decreased cardiac output.

  2. Dopamine causes cardiac stimulation in cardiac arrest and is used for bronchodilation.
    • Rationale:

      This answer is not correct because epinephrine, not dopamine, is used for cardiac stimulation in cardiac arrest and bronchodilation in asthma or allergic reactions. Dopamine is an adrenergic agonist utilized in patient care to increase a patient’s low blood pressure and cardiac output. This is used when a patient has acute kidney failure caused by low cardiac output.

  3. Dopamine is used to treat acute kidney failure caused by low cardiac output.
    • Rationale:

      This answer is correct because dopamine is administered to patients to help restore adequate cardiac output, blood pressure, and kidney function. Dopamine is often used to treat acute kidney failure associated with decreased cardiac output.

  4. Dopamine causes myocardial vasodilation and decreases afterload and preload.
    • Rationale:

      This answer is not correct because nitroglycerin, not dopamine, causes vasodilation and decreases preload and afterload. Dopamine functions to increase cardiac output through stimulation of alpha and beta receptors. Dopamine is often used to treat acute kidney failure associated with decreased cardiac output.

Overview

Dopamine is administered to patients to help restore adequate cardiac output, blood pressure, and kidney function. This important vasopressor action helps treat acute kidney failure caused by low cardiac output.

Explanation

Learning Outcomes

Dopamine is an adrenergic agonist utilized in patient care to increase a patient’s low blood pressure and cardiac output. This is used when a patient has acute kidney failure caused by low cardiac output. Understanding how dopamine functions in the body is important and helps the nurse understand what to monitor the patient for to show effectiveness of the treatment. Improvement will be reflected by increasing blood pressure, improving urinary output, and improved blood urea nitrogen (BUN) and creatinine blood levels.

Test Taking Tip

The following are crucial requisites for doing well on the NCLEX exam: (1) A sound understanding of the subject; (2) The ability to follow explicitly the directions given at the beginning of the test; (3) The ability to comprehend what is read; (4) The patience to read each question and set of options carefully before deciding how to answer the question; (5) The ability to use the computer correctly to record answers; (6) The determination to do well; (7) A degree of confidence.

Video Rationale