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Which electrolyte imbalance is most likely indicated by a peaked T wave on an ECG?

A.

Hyperkalemia

B.

Hypocalcemia

C.

Hyponatremia

D.

Hypomagnesemia

Answer and Explanation

The Correct Answer is A

Rationale:
A tall, peaked T wave on an ECG is a classic sign of elevated potassium levels, which can progress to life-threatening arrhythmias if untreated.
B. Hypocalcemia is incorrect; it is associated with prolonged QT intervals and tetany, not peaked T waves.
C. Hyponatremia is incorrect; it typically causes neurologic symptoms (confusion, seizures) rather than characteristic ECG changes.
D. Hypomagnesemia is incorrect; it can cause prolonged QT and torsades de pointes, but not peaked T waves.


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Related Questions

Correct Answer is []

Explanation

Rationale:

  • Potential Condition: The client developed new onset of severe, frequent diarrhea after receiving IV antibiotics (cefazolin), along with fever, abdominal cramping, dehydration (dry mucous membranes), and hyperactive bowel sounds. These are hallmark features of Clostridioides difficile colitis.
  • Actions to Take:
    • Contact precautions (gown and gloves) are essential to prevent transmission since C. difficile is highly contagious.
    • IV fluids help correct dehydration and electrolyte losses caused by frequent diarrhea.
  • Parameters to Monitor:
    • Serum potassium should be monitored because diarrhea causes large potassium losses, risking hypokalemia.
    • Blood pressure should be tracked closely since dehydration and electrolyte loss can lead to hypotension and hemodynamic instability.

Correct Answer is C

Explanation

Rationale:

A. The tubing for TPN must be changed every 24 hr (not 48 hr) to reduce the risk of central line–associated bloodstream infection (CLABSI).

B. Lipid emulsions should not hang for more than 12 hr to prevent bacterial growth and infection.

C. A 1.2-micron filter is required for TPN that contains lipids to remove particulate matter, bacteria, and fungi, since lipid solutions cannot pass through smaller filters.

D. TPN solutions should be changed every 24 hr (not 36 hr) to reduce infection risk.

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