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ECG Basics
 
 

The U Wave

February 15th, 2021
 
 
 
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On this page:Inverted U Waves

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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