An ECG shows a prolonged QT interval in a patient on antipsychotics. Which electrolyte imbalance is most likely responsible?

An ECG shows a prolonged QT interval in a patient on antipsychotics. Which electrolyte imbalance is most likely responsible?

  • Correct Answer: Hypokalemia
  • Hypercalcemia
  • Hyponatremia
  • Hyperkalemia

Explanation: Hypokalemia is a common cause of prolonged QT interval increasing arrhythmia risk.

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