A patient receiving intravenous potassium develops muscle weakness and the cardiac monitor shows widening QRS complexes. What should the nurse do first?

Correct answer: A. Stop the potassium infusion immediately

  • A. Stop the potassium infusion immediately
  • B. Encourage the patient to drink additional fluids
  • C. Recheck the potassium level at the next routine time
  • D. Ask the patient to walk to assess muscle strength

Explanation

Widened QRS complexes during potassium administration indicate potentially life-threatening potassium toxicity. The nurse stops the potassium source immediately and calls for urgent medical review while maintaining cardiac monitoring. Waiting for a routine blood test or encouraging activity delays treatment.

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Clinical judgement links assessment findings, nursing knowledge and patient responses to a safe decision. Coverage includes ABCDE assessment, recognising actual or potential instability, prioritising airway, breathing and circulation, using urgency and risk rather than routine order, reassessing after intervention, and distinguishing a nursing priority from a medical diagnosis or a task that can wait.

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