Overview
The U wave reflects repolarisation of mid-myocardial cells, between the endocardium and epicardium. It is not normally visible on the electrocardiogram.
Look For
- A low amplitude deflection after the T wave, most evident in the precordial leads.
Causes of Prominent U Waves
- Athletes
- Hypokalaemia
- Hypercalcaemia
Inverted U Waves
Look For
- Inversion of U waves in the precordial leads.
Causes of Inverted U Waves
- Acute ischaemia
- Hypertension
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