<prompt> Hypokalemia ECG changes-Tall T waveSho QRS intervalDepressed ST segmentAbsent P wave  <response>: Hypocalcemia: The most significant sign is intermittent QT prolongation, or intermittent prolongation of the QTc corrected QT interval secondary to a lengthened ST segment and depressed ST segment. Although rare, this may lead to arrhythmias such as torsades de pointes, VT, or complete hea block. Ref : Harrison 20th edition pg 1435 