A 47-year-old woman presented with extreme hypercalcaemia due to a parathyroid carcinoma. An electrocardiogram which was recorded when the hypercalcaemia was associated with hypokalaemia showed absence of the ST segment, prolonged T wave, a shortened QTac interval and prominent U waves.
The electrocardiographic abnormalities in isolated hypercalcaemia and hypokalaemia have been well documented in the literature. However, electrocardiogram (ECG) findings in combined hypercalcaemia and hypokalaemia have rarely been described.
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