All are ECG changes hypokalemia,except-
U wave
ST segment sagging
T-wave flattening or inversion
QT interval prolongation
Multiple medications, electrolyte abnormalities (hypocalcemia, hypomagnesemia and hypokalemia) and ceain disease states (ie, intracranial hemorrhage) can prolong the QT interval. Prolonged QT genetic syndromes exist and include Romano-Ward syndrome, Jervell-Lange-Nielsen syndrome and long-QT syndrome. Ref Harrison 20th edition pg 1445
C.V.S