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  • October 4, 2018
You are here: Home / Resources / ECG / Sinus Rhythms

Sinus Rhythms

April 27, 2014 by EMTResource.com 1 Comment

A sinus rhythm occurs when the SA node acts as the primary pacemaker of the heart.

Normal Sinus Rhythm

  • Rate: 60-100 bpm
  • Rhythm: Regular
  • P Waves: Identical in shape and before each QRS complex
  • PR Intervals: Normal and equal
  • R-R Intervals: Equal
  • QRS Complexes: Normal and after each P wave

normal-sinus-rhythm

Sinus Arrhythmia

  • Rate: 60-100 bpm
  • Rhythm: Irregular
  • P Waves: Identical in shape and before each QRS complex
  • PR Intervals: Normal and equal
  • R-R Intervals: Unequal
  • QRS Complexes: Normal and after each P wave

sinus-arrhythmia

Sinus Bradycardia

  • Rate: < 60 bpm
  • Rhythm: Regular
  • P Waves: Identical in shape and before each QRS complex
  • PR Intervals: Normal and equal
  • R-R Intervals: Equal
  • QRS Complexes: Normal and after each P wave

sinus-bradycardia

Sinus Tachycardia

  • Rate: 100-150 bpm
  • Rhythm: Regular
  • P Waves: Identical in shape and before each QRS complex
  • PR Intervals: Normal and equal
  • R-R Intervals: Equal
  • QRS Complexes: Normal and after each P wave

sinus-tachycardia

Sinus Arrest

  • Rate: 60-100 bpm
  • Rhythm: Regular, except during a pause
  • P Waves: Identical in shape and before each QRS complex, but are absent during a pause
  • PR Intervals: Normal and equal, but are not measurable during a pause
  • R-R Intervals: Equal, except during a pause
  • QRS Complexes: Normal and after each P wave, but are absent during a pause

sinus-arrest

Filed Under: ECG Tagged With: ECG

Comments

  1. morie says

    August 23, 2014 at 7:12 am

    how about your ventricular rhythms?

    Reply

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