A patient with a serum potassium level of 6.2 mEq/L and peaked T waves on the ECG is receiving an intravenous infusion of calcium gluconate. What is the most critical adverse effect the nurse must monitor for during this infusion?

1. A

   Severe hypertension

2. B

   Respiratory depression

3. C

   Bradycardia and hypotension

4. D

   Hypoglycemia

Appeared in: NORCET 9 Prelims-2025

Explanation

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• Calcium gluconate is administered in hyperkalemia to counteract the toxic effects of high potassium on the heart's cell membranes, thereby preventing life-threatening arrhythmias.
• However, if infused too rapidly, intravenous calcium can cause significant cardiovascular adverse effects.
• The most critical of these are bradycardia (a dangerously slow heart rate) and hypotension (low blood pressure), which can progress to cardiac arrest.
• This reaction occurs because a sudden high concentration of calcium can depress the heart's electrical conduction system and myocardial contractility.
• Therefore, continuous cardiac monitoring and frequent blood pressure checks are essential nursing responsibilities during the infusion.

Why Other Options Were Wrong

• Option A: Rapid IV calcium infusion is more likely to cause hypotension due to its effects on cardiac contractility and vascular tone, not hypertension.
• Option B: Respiratory depression is not a direct or primary adverse effect of calcium gluconate. It could only occur as a late and secondary complication of severe cardiovascular collapse caused by profound bradycardia or hypotension.
• Option D: Calcium gluconate has no direct effect on blood glucose metabolism and does not cause hypoglycemia.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Adverse effects of IV calcium gluconate for hyperkalemia management in acute care settings.
• Nurses must always administer IV calcium gluconate slowly, using an infusion pump, at a rate not exceeding 1-2 mL/min to prevent cardiac complications.
• Continuous ECG monitoring and checking blood pressure every 5-15 minutes are the standards of care during infusion for a patient with hyperkalemia-related ECG changes.
• What if? If the patient were also taking digoxin, the risk of calcium-induced arrhythmias (including bradycardia and heart block) would be significantly higher. This is because both digoxin and calcium increase intracellular calcium in myocardial cells, potentiating the risk of toxicity. The infusion would need to be even slower and more closely monitored.

How to Approach the Question

• First, identify the key elements of the clinical scenario: the patient has severe hyperkalemia (K+ 6.2 mEq/L) with a clear cardiac manifestation (peaked T waves).
• Next, identify the intervention being performed: an intravenous infusion of calcium gluconate.
• Recall the primary purpose of this specific intervention in this context. Calcium gluconate is not used to lower potassium but to protect the heart from its effects.
• Focus on the pharmacology of the drug being administered. Think about the major adverse effects of IV calcium, especially when given rapidly. The name 'calcium' itself should direct your thinking toward its effects on muscle and electrical conduction, particularly in the heart.
• Evaluate the given options based on this knowledge. Bradycardia and hypotension are well-documented, direct consequences of rapid IV calcium infusion. The other options are not directly related or are secondary effects.
• Select the option that represents the most immediate and life-threatening risk associated with the administration of the drug itself.

Concept Tested & Keywords

• Concept Tested: Adverse effects of IV calcium gluconate for hyperkalemia management
• Stem keywords: serum potassium, 6.2 mEq/L, peaked T waves, ECG, intravenous infusion, calcium gluconate, adverse effect
• Lead-in keywords: most critical
• Clinical cues: Potassium level of 6.2 mEq/L indicates moderate to severe hyperkalemia.
• Clinical cues: Peaked T waves are a sign of cardiac muscle irritability from hyperkalemia requiring urgent intervention.

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Reference Book

E6 Pharmacology Nursing Lilley 11e Part 3 p. 213-215

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 542-544

E6 Medicine Harrison 22e Part 1 p. 400-402