NORCET 9 Prelims-2025: A patient's laboratory report shows serum potassium 6.3 mEq/L. The doctor orders intravenous calcium. What is…

NORCET 9 Prelims-2025

Medical & Surgical Nursing

Hard

Appeared in: NORCET 9 Prelims-2025

Explanation

A serum potassium of 6.3 mEq/L is severe hyperkalemia, a medical emergency that can cause fatal cardiac arrhythmias.
The priority intervention is to stabilize the cardiac membrane to prevent arrhythmias. Intravenous calcium is the first-line agent for this purpose.
IV calcium antagonizes the toxic effect of potassium on the heart muscle but does not lower the serum potassium level.
Safe administration requires a slow infusion, typically over 10-15 minutes, to prevent adverse effects from the calcium itself, such as bradycardia or hypotension.
Continuous cardiac monitoring (ECG) is mandatory during administration to assess the heart's response and ensure patient safety.

Option B: Administering calcium as a rapid IV push is dangerous as it can cause severe bradycardia, hypotension, and cardiac arrest.
Option C: Delaying treatment for a critically high potassium level is unsafe. The patient is at immediate risk of a fatal arrhythmia, and waiting an hour without intervening is negligent.
Option D: Oral medications act too slowly to be effective in an emergency. While a potassium binder is part of the overall treatment, it is not the priority for immediate cardiac protection.

Clinical Relevance

Nursing practice connection: Knowing Emergency management of severe hyperkalemia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must recognize critical lab values like severe hyperkalemia and act swiftly. The correct sequence of interventions is crucial: first, protect the heart with calcium; second, shift potassium into cells with insulin/dextrose; and third, remove potassium from the body with diuretics or binders.
Always place the patient on a cardiac monitor before, during, and after administering IV calcium for hyperkalemia. This is a non-negotiable safety standard.
What if? If the patient was also taking digoxin, the nurse must be even more cautious. Hypercalcemia (from the IV calcium) potentiates digoxin toxicity, increasing the risk of arrhythmias. The infusion must be especially slow (e.g., over 20-30 minutes) and the patient monitored very closely.

How to Approach the Question

First, identify the critical clinical data: The lab value 'serum potassium 6.3 mEq/L' indicates severe, life-threatening hyperkalemia.
Next, understand the question's focus: It asks for the 'priority action,' which means the most important first step to ensure immediate patient safety.
Recall the purpose of the ordered intervention: In hyperkalemia, intravenous calcium is used for immediate cardiac protection, not to lower potassium levels.
Evaluate each option based on safety and speed of action. The priority is to stabilize the heart quickly but safely.
Eliminate options that are too slow (oral medications), inherently dangerous (rapid IV push), or involve an unsafe delay (holding the medication).
Select the option that combines the correct drug administration technique (slow infusion) with the necessary safety monitoring (arrhythmia monitoring), as this represents the standard of care.

Concept Tested & Keywords

Concept Tested: Emergency management of severe hyperkalemia
Stem keywords: serum potassium 6.3 mEq/L, intravenous calcium, priority action
Lead-in keywords: priority action
Clinical cues: Serum potassium 6.3 mEq/L signifies a life-threatening electrolyte imbalance requiring immediate intervention.

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