The ECG finding of hypokalemia is a "U wave". This is an extra positive deflection after the T wave and before the next P wave as seen in lead II on this ECG. This patient had a potassium level of ...
The differential diagnosis of a U-wave includes hypokalemia, cardiac ischemia ... potassium level less than 2.5 mEq/mL, concerning ECG changes, or significant muscle weakness.
Diffuse T wave inversion is stage III of the ECG changes in pericarditis ... but negative QRS in lead I). Hypokalemia causes U waves in the ECG seen as a positive wave just after the T wave.
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