Upon review of this body and the described ECG findings, certain common patterns ... [91] There is little data on specific T- and/or U-wave findings associated with cocaine use.

Hypokalemia causes U waves in the ECG seen as a positive wave just after the T wave. Hyperkalemia causes peaked T waves initially, then an intraventricular conduction delay with a widened QRS ...

Vital signs are normal. You ask for a 12-lead ECG which is below. Explanation: A "U wave" occurs just after the T wave and significantly before the following P wave. U waves can at times be ...