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B. Potassium levels was severely elevated: 7.5 mmol/L. Note the flattened P wave. The widened QRS and the abnormal repolarization.
[[File:E000560.jpg|400px|ECG 3]][[File:E000562.jpg|400px|ECG 4]]
Also compare ECGs 3 and 4 which were made during correction of potassium levels. ECG 3 clearly shows peaked T waves.