PMC3714036_01
Electrocardiogram while potassium was 8.0 demonstrating tall, peaked T waves and wide QRS.
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The initial electrocardiogram (ECG) (Fig. 1) revealed tall, peaked T waves (greater than 10 mm) and a QRS duration of 100 msec.
Electrocardiogram while potassium was 5.9 demonstrating narrowing of the QRS and less peaked T waves.
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Normal electrocardiogram when potassium normalized.
JCHIMP-1-8707-g003.jpg
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Potassium had dropped to 5.9 by that time. Potassium decreased further to 4.2 after 9 more hours, and the tracing at that time was identical to the normal one taken a week later (Fig. 3).