All are ECG changes hypokalemia,except-
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
U wave
ST segment sagging
T-wave flattening or inversion
QT interval prolongation
C.V.S