Figure 94-29b

ECG changes of hypokalemia. A striking U wave with a marked prolongation of a QU interval is recorded on June21,1979.The K level at that time was 1.3 meq /liter. With replacement of K, there was a gradual improvement with a normal QT and U wave recorded on June 25,1979 , at a plasma K of 3.9 meq /liter.