Heart Rhythm Guide
Heart Rhythm Guide
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Sinus Rhythms

Normal Sinus Rhythm


  • Heart Rate: 60 to 100 beats per minute
  • P Wave: Before each QRS, identical
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Normal Sinus Rhythm





Sinus Arrhythmia


  • Heart Rate: 60 to 100 beats per minute
  • P Wave: Before each QRS, identical
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Sinus Arrhythmia





Sinus Tachycardia


  • Heart Rate: Greater than 100 beats per minute
  • P Wave: Before each QRS, identical
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Sinus Tachycardia





Sinus Bradycardia


  • Heart Rate: Less then 60 beats per minute
  • P Wave: Before each QRS, identical
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Sinus Bradycardia





Sinus Pause


  • Heart Rate: Undetermined
  • P Wave: Before each QRS, identical, dropped beat, p to p is undisturbed
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Sinus Pause





Sinus Arrest


  • Heart Rate: Undetermined
  • P Wave: Before each QRS, identical, dropped beat, p to p is undisturbed
  • PR Interval: 120 to 200ms
  • QRS Interval: Less then 120ms
Sinus Arrest