Calcium disorders mainly affect the QT interval on the ECG.
Hypocalcaemia (low serum calcium) causes a long QT interval. If you look closely at the long QT of hypocalcaemia you will notice that it lengthens the ST segment without greatly affecting the T wave.
It is interesting to note that because low calcium levels seem to affect the ST segment without affecting the T waves, very low calcium levels seem to have a lower risk of developing dysrhythmias than other causes of a prolonged QT interval.
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