<prompt> QT interval is shoens inHypocalcaemiaHypokalemiaHypercalcaemiaHyperkalemia  <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 1567 