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QRS wave

Authoring team

The normal QRS complex has four characteristics:

  • the duration of the QRS complex is no greater than 0.12 seconds (3 small squares)
  • in a right ventricular lead (V1) the S wave is greater than the R wave
  • the height of the R wave in the left ventricular leads (V5, V6) is less than 25 mm
  • Q waves due to septal depolarisation may occur in the left ventricular leads (V5, V6) but these are less than 1 mm across and less than 2 mm deep

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