<prompt> Hypocalcaemia is characterized by the following features exceptNumbness and tingling of circumoral regionHyperactivity tendon reflexesShoing of QT interval in ECGCarpopedal spasm  <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 1421 