After 1 week of hospitalization, Anurag develops hypokalemia. Which of the following is the most significant symptom of his disorder?

Appeared in: JSSH Staff Nurse - 2019

Explanation

Potassium is crucial for muscle and nerve cell function, particularly for the electrical impulses that trigger muscle contraction.
Low potassium (hypokalemia) hyperpolarizes cell membranes, making them less excitable. This results in decreased muscle strength.
Muscle weakness is the most significant and specific neuromuscular sign, typically starting in the lower extremities and potentially progressing to affect respiratory muscles.

Option A: While lethargy and fatigue can occur, they are general, non-specific symptoms found in many conditions and are not the most significant indicator of hypokalemia.
Option C: Hypokalemia typically causes cardiovascular changes like a weak, irregular pulse and hypotension (low blood pressure), not an increase in pulse and BP.
Option D: Muscle irritability, twitching, and tetany are classic signs of hypocalcemia (low calcium) or hypomagnesemia, not hypokalemia.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing Identifying the hallmark symptom of hypokalemia in the correct sequence, documenting the action clearly, and monitoring for the expected response.
Nurses must prioritize monitoring for muscle weakness in patients at risk for hypokalemia (e.g., those on diuretics, with vomiting/diarrhea), as progression to respiratory muscle weakness is a life-threatening emergency.
Patient safety is critical when administering potassium. IV potassium must ALWAYS be diluted and infused slowly via a pump; NEVER give as an IV push, as it can cause fatal cardiac arrest.
What if the patient also had chronic kidney disease? The risk of iatrogenic hyperkalemia from potassium replacement therapy would be extremely high. This would necessitate smaller doses, more frequent monitoring of potassium levels, and careful assessment of renal function before and during treatment.

How to Approach the Question

First, identify the core concept: the question asks for the 'most significant' symptom of hypokalemia.
This requires you to differentiate between common/non-specific symptoms and hallmark/defining signs.
Evaluate each option based on the known pathophysiology of hypokalemia.
Recall that potassium's primary role involves muscle and nerve function. Look for an option that directly relates to this critical function.
Eliminate options that are either non-specific (Lethargy), physiologically incorrect (Increased pulse/BP), or characteristic of another electrolyte imbalance (Muscle irritability for hypocalcemia).

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 381-383

E6 Medicine Harrison 22e Part 1 p. 397-399

E6 Pharmacology Nursing Lilley 11e Part 2 p. 165-167

Practise the full JSSH Staff Nurse - 2019

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