A patient is administered furosemide injection. What is the primary therapeutic effect of this medication in the clinical setting?

Appeared in: NORCET 6 Prelims -2024

Explanation

Furosemide is classified as a loop diuretic, one of the most potent types of diuretics available.
It acts on the thick ascending limb of the Loop of Henle in the kidney's nephrons.
The primary mechanism is the inhibition of sodium and chloride reabsorption, which leads to a significant increase in water excretion (diuresis).
This rapid removal of excess fluid from the body is its main therapeutic effect, making it crucial for managing conditions involving fluid overload, such as heart failure, pulmonary edema, and cirrhosis.

Option B: Furosemide is a diuretic, not an Angiotensin-Converting Enzyme (ACE) inhibitor. These are two distinct classes of cardiovascular drugs with different mechanisms.
Option C: Furosemide's primary action is on the kidneys to promote diuresis; it does not have a primary therapeutic effect on gastric movement or motility.
Option D: Furosemide is a loop diuretic, which is more potent and acts on a different part of the nephron than thiazide diuretics.

Visual 1: Diagram - An illustration of the kidney nephron, highlighting the Loop of Henle to show the precise site of action for furosemide compared to other diuretics like thiazides (acting on the distal tubule).
Visual 2: Flowchart - A simple flowchart showing how furosemide administration leads to blocked sodium reabsorption, increased water excretion, reduced blood volume, and decreased edema.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacology: Mechanism of Action of Diuretics to guide bedside assessment, documentation, and the next nursing action.
A key nursing responsibility when administering IV furosemide is to closely monitor the patient's fluid and electrolyte balance, particularly for hypokalemia (low potassium), hypotension, and signs of dehydration.
Nurses must monitor urine output, blood pressure, and daily weights to assess the drug's effectiveness and prevent adverse effects.
Patient education should include instructions to rise slowly to prevent orthostatic hypotension and to report symptoms like muscle cramps, weakness, or dizziness, which could indicate electrolyte imbalance.

How to Approach the Question

First, identify the drug mentioned in the question: 'furosemide'.
Recall the pharmacological class of furosemide. It is a classic, prototypical 'loop diuretic'.
Understand the primary function of this drug class. Diuretics, in general, increase urine output. Loop diuretics are particularly potent in this regard.
Evaluate the options based on this core knowledge. Option A correctly identifies furosemide as a 'loop diuretic' and links it to its purpose of managing 'excessive fluid volume'.
Systematically eliminate the other options by identifying them as incorrect classifications or effects. B is a different drug class (ACE inhibitor), C describes an unrelated physiological effect (gastric movement), and D is a different, less potent type of diuretic (thiazide).

Concept Tested & Keywords

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Practise the full NORCET 6 Prelims -2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.