<prompt> QT prolongation is seen in all exceptHypothermiaDigitalis toxicityHypocalcaemiaRomanowand syndrome  <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 c digitalis effect. Ref Harrison 20th edition pg 1534 