What are normal values for waves and intervals on electrocardiography (ECG)?

Updated: Dec 10, 2014
  • Author: Buck Christensen; Chief Editor: Buck Christensen  more...
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Answer

Answer

Normal values for waves and intervals are as follows:

  • RR interval: 0.6-1.2 seconds

  • P wave: 80 milliseconds

  • PR interval: 120-200 milliseconds

  • PR segment: 50-120 milliseconds

  • QRS complex: 80-100 milliseconds

  • J-point: N/A

  • ST segment: 80-120 milliseconds

  • T wave: 160 milliseconds

  • ST interval: 320 milliseconds

  • QT interval: 420 milliseconds or less if heart rate is 60 beats per minute (bpm)


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