Which ECG finding is associated with hypercalcemia?

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Multiple Choice

Which ECG finding is associated with hypercalcemia?

Explanation:
Higher calcium levels speed up ventricular repolarization, shortening the ventricular action potential duration. On the ECG, this reduces the QT interval, since the QT reflects the time from start of depolarization to end of repolarization. So hypercalcemia is classically associated with a shortened QT interval. Prolonged QT is more typical of hypocalcemia, U waves suggest hypokalemia, and a wide QRS points to conduction disturbances or other electrolyte issues rather than hypercalcemia.

Higher calcium levels speed up ventricular repolarization, shortening the ventricular action potential duration. On the ECG, this reduces the QT interval, since the QT reflects the time from start of depolarization to end of repolarization. So hypercalcemia is classically associated with a shortened QT interval. Prolonged QT is more typical of hypocalcemia, U waves suggest hypokalemia, and a wide QRS points to conduction disturbances or other electrolyte issues rather than hypercalcemia.

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