Which symptom should the nurse assess when a patient receives loop diuretics?

RRB Nsg. Superintendent -29 April-2025 (shift-2nd)

Pharmacology

Medium

Appeared in: RRB Nsg. Superintendent -29 April-2025 (shift-2nd)

Explanation

Loop diuretics work in the loop of Henle to inhibit sodium and chloride reabsorption, leading to significant excretion of water and electrolytes, most notably potassium.
This potassium loss results in hypokalemia (serum potassium level below 3.5 mEq/L).
Hypokalemia impairs neuromuscular and cardiac function.
Impaired cardiac function manifests as arrhythmias, which are felt as a weak and irregular pulse.
Impaired neuromuscular function leads to generalized muscle weakness and poor muscle tone.

Option A: Loop diuretics are prescribed to treat hypertension, so they cause a decrease, not an increase, in blood pressure. While muscle cramps can occur with electrolyte imbalances, muscle spasms are more classically associated with hypocalcemia or hypomagnesemia.
Option B: Paresthesias (tingling or numbness) and irritability are classic signs of hyperkalemia (high potassium), which is the opposite of the condition caused by loop diuretics.
Option C: While severe electrolyte imbalances can affect mental status, restlessness and agitation are non-specific symptoms. The more characteristic presentation of hypokalemia is lethargy, fatigue, and weakness.

Visual 1: Diagram: A diagram of the nephron highlighting the Loop of Henle to show the site of action for loop diuretics.
Visual 2: ECG Strip: An image of an electrocardiogram (ECG) showing the characteristic changes of hypokalemia, such as flattened T-waves and the presence of a U-wave. This helps visualize the cardiac impact.

Clinical Relevance

Nursing practice connection: Use the key finding related to Adverse effects of loop diuretics and assessment for hypokalemia to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary role when administering loop diuretics is to monitor for signs of dehydration and electrolyte imbalance, especially hypokalemia.
Early detection of a weak, irregular pulse can prevent progression to life-threatening cardiac arrhythmias. This requires diligent vital sign monitoring and cardiac assessment.
Patient education is crucial. The nurse should teach the patient to report symptoms like weakness, fatigue, or palpitations and to consume potassium-rich foods (e.g., bananas, oranges, spinach) if appropriate.

How to Approach the Question

First, identify the drug class mentioned in the question: 'loop diuretics'.
Recall the primary mechanism and the most common, significant side effect of this drug class. For loop diuretics, this is potassium wasting.
Identify the resulting electrolyte imbalance: hypokalemia (low potassium).
Think about the function of potassium in the body (cardiac and muscle function) and predict the symptoms of a deficiency.
Evaluate each option to see which one lists the classic signs of hypokalemia.
Select the option that directly matches the expected symptoms: weak/irregular pulse (cardiac effect) and poor muscle tone (neuromuscular effect).

Concept Tested & Keywords

Concept Tested: Adverse effects of loop diuretics and assessment for hypokalemia.
Stem keywords: loop diuretics, symptom, assess
Lead-in keywords: Which
Clinical cues: A patient receiving loop diuretics indicates a need to monitor for fluid and electrolyte imbalances.

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