Prominent U waves

A prominent U wave (>0.2 mV) is usually suggestive of hypokalemia, although it may be seen in other circumstances.

Graphic 57086 Version 1.0

Normal rhythm strip

Normal rhythm strip in lead II. The PR interval is 0.15 sec and the QRS duration is 0.08 sec. Both the P and T waves are upright.

Courtesy of Morton F Arnsdorf, MD.

Graphic 59022 Version 3.0

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