• The impulse originates in the SA node
• Both the atrial and ventricular rhythms are regular
• The rate is between 60 and 100 beats per minute

Sinus Bradycardia - (Non Symptomatic)
Sinus Tachycardia

Sinus Arrhythmia
Wandering Atrial Pacemaker

Atrial Rhythms

Sinus Arrest
Premature Atrial Complex
Atrial Tachycardia
Paroxysmal SupraVentricular Tachycardia (PSVT)
Multifocal Atrial Tachycardia
Atrial Flutter
Atrial Fibrillation

Junctional Rhythms
Junctional Premature Beats
Junctional Escape Rhythm 
Junctional Tachycardia
Paroxysmal Junctional Tachycardia
Premature Ventricular Contraction
Multifocal PVCs
PVC Couplets
First Degree AV Block
Second Degree AV Block Type I (Wenchebach or Mobitz Type I)
SA Block
Junctional Escape Beats
Ventricular Escape Beats
Artifact

Ventricular Fibrillation