<prompt> Hypercalcaemia in ECG is diagnosed byIncreased QT intervalDecreased QT intervalIncreased PR intervalTall T waves  <response>: Hypocalcemia typically prolongs the QT interval ST poion, whereas hypercalcemia shoens it .Digitalis glycosides also shoen the QT interval, often with a characteristic scooping of the ST-T-wave complex digitalis effect. Ref Harrison 20th edition pg 1532 