The patient has the diagnosis of left ventricular failure and a high pulmonary capillary wedge pressure PCWP. The physician orders dopamine to improve ventricular function. The nurse will know the medication is working if the patient's?

1. A

   Blood pressure raise

2. B

   Blood pressure decrease

3. C

   Cardiac index fails

4. D

   PCWP Raise

Appeared in: PGIMER NO - 2020

Explanation

• Dopamine is used in left ventricular failure to improve cardiac function. A key sign of its effectiveness is an increase in blood pressure.
• At moderate doses (5-10 mcg/kg/min), dopamine acts as a positive inotrope, stimulating beta-1 receptors to increase the force of heart contractions.
• This increased contractility improves cardiac output, the amount of blood the heart pumps per minute.
• An improved cardiac output directly leads to a rise in systemic blood pressure, indicating better perfusion to the body's organs.

Why Other Options Were Wrong

• Option B: A decrease in blood pressure would signify worsening heart failure or an adverse drug reaction, not a therapeutic effect. Dopamine is a vasopressor and inotrope, expected to raise blood pressure.
• Option C: The cardiac index is a measure of cardiac output adjusted for body size. The therapeutic goal of dopamine in this setting is to increase the cardiac index. A failing or decreasing cardiac index indicates the medication is not working.
• Option D: The patient already has a high PCWP, which reflects fluid overload and congestion in the lungs due to the failing left ventricle. An effective treatment should lower the PCWP by improving the heart's ability to pump blood forward.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Pharmacological management of heart failure and assessment of therapeutic effectiveness in acute care settings.
• Nurses administering dopamine must perform continuous hemodynamic monitoring, including blood pressure, heart rate, and urine output, to assess therapeutic effects and detect adverse reactions.
• Dopamine is a vesicant, meaning it can cause severe tissue damage if it leaks out of the vein (extravasation). Therefore, it is preferably administered through a central venous line, and the IV site must be monitored closely.
• What if? If the patient develops significant tachycardia (a very fast heart rate) while on dopamine, it may indicate excessive beta-1 stimulation. The nurse should notify the physician, as the dose may need to be reduced or an alternative agent considered.

How to Approach the Question

• First, identify the patient's primary problem: left ventricular failure with high PCWP, which means the heart pump is weak and fluid is backing up into the lungs.
• Next, understand the goal of the prescribed medication, dopamine: to 'improve ventricular function,' meaning to make the heart pump stronger.
• Recall the mechanism of dopamine. It's an inotrope, which increases the force of contraction of the heart muscle.
• Think about the direct consequence of a stronger heart pump: it will push more blood out with each beat (increased cardiac output).
• Connect increased cardiac output to a measurable vital sign. More blood being pumped into the arteries will increase the pressure within them.
• Evaluate the options based on this logic. A 'blood pressure raise' is the most direct and immediate indicator that the heart's pumping function has improved.

Concept Tested & Keywords

• Concept Tested: Pharmacological management of heart failure and assessment of therapeutic effectiveness.
• Stem keywords: left ventricular failure, high pulmonary capillary wedge pressure, PCWP, dopamine, improve ventricular function
• Lead-in keywords: medication is working if
• Clinical cues: Patient with diagnosed left ventricular failure and high PCWP, indicating significant cardiac dysfunction and pulmonary congestion.

Question ID

Q4eVNvyfVfhw_9Jf1AUZoP

Copy ID

Reference Book

E6 Medicine Harrison 22e Part 2 pp. 233-235, 219-221, 235-237