Calcium disorders mainly affect the QT interval on the ECG.

Hypercalcaemia (high serum calcium) causes a short QT interval. If the calcium level is very high, it may also cause Osborn waves (an extra notch or J wave at the end of the QRS) or even a VF arrest.

See also: Electrolytes

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In the ECGquest archives, this ECG has been tagged with: - 12-Lead Osborn wave Short QT Wide QRS Hypercalcaemia LITFL CC-BY-NC-SA
Severe hypercalcaemia from parathyroid adenoma

This ECG is from a man in his 40s who presented critically unwell on a background of a parathyroid adenoma.