heart rhythm guide
heart rhythm guide

Heart Rhythm Supraventricular Defects

Atrial Fibrillation


  • Heart Rate: A: 350 to 650 V: Slow to rapid
  • P Wave: Fibrillatory
  • PR Interval: None
  • QRS Interval: Less then 120ms
Atrial Fibrillation




Atrial Flutter


  • Heart Rate: A: 220 to 430 V: Less then 300bpm
  • P Wave: Sawtooth appearance
  • PR Interval: None
  • QRS Interval: Less then 120ms
Atrial Flutter




Atrial Tachycardia


  • Heart Rate: 140 to 250 beats per minute (BPM)
  • P Wave: Abnormal P before each QRS
  • PR Interval: Less then 200ms
  • QRS Interval: Less then 120ms
Atrial Tachycardia




Premature Atrial Contraction Isolated


  • Heart Rate: None
  • P Wave: Premature and abnormal or hidden
  • PR Interval: Less then 200ms
  • QRS Interval: Less then 120ms
Premature Atrial Contraction Isolated




Premature Atrial Contraction Paired


  • Heart Rate: None
  • P Wave: Premature and abnormal or hidden
  • PR Interval: Less then 200ms
  • QRS Interval: Less then 120ms
Premature Atrial Contraction Paired




Premature Atrial Contraction Atrial Bigeminy


  • Heart Rate: None
  • P Wave: Premature and abnormal or hidden
  • PR Interval: Less then 200ms
  • QRS Interval: Less then 120ms
Premature Atrial Contraction Atrial Bigeminy




Premature Atrial Contraction Aberrantly Conducted


  • Heart Rate: None
  • P Wave: Premature and abnormal or hidden
  • PR Interval: Less then 200ms
  • QRS Interval: Abnormal
Premature Atrial Contraction Aberrantly Conducted




Junctional Rhythm


  • Heart Rate: 40 to 60 beats per minute (BPM)
  • P Wave: Inverted, absent or after QRS
  • PR Interval: Less then 120ms
  • QRS Interval: Less then 120ms. Every other beat is a premature atrial contraction (PAC)
Junctional Rhythm




Junctional Tachycardia


  • Heart Rate: Greater then 100 beats per minute (BPM)
  • P Wave: Inverted, absent or after QRS
  • PR Interval: Less then 120ms
  • QRS Interval: Less then 120ms
Junctional Tachycardia




Accelerated Junctional Rhythm


  • Heart Rate: 60 to 100 beats per minute (BPM)
  • P Wave: Inverted, absent or after QRS
  • PR Interval: Less then 120ms
  • QRS Interval: Less then 120ms
Accelerated Junctional Rhythm




Wandering Pacemaker


  • Heart Rate: Less then 60 beats per minute (BPM)
  • P Wave: Multiple forms
  • PR Interval: Variable
  • QRS Interval: Less then 120ms
Wandering Pacemaker




Next Section: Pacemakers