Hypocalcaemia (low serum calcium) causes a long QT interval.See also: Electrolytes
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ECG of the Week – 31st December 2018 – Interpretation
Found comatose with prehospital ECG showing “bigeminal PVCs” and “Tachycardia at a rate of 156”
ECG of the Week – 29th January 2018 – Interpretation