Tachycardia

DDx

Narrow & Regular

• Sinus tachycardia
• Atrial flutter
• AV node re-entry tachycardia (AVNRT)
• Atrial ventricular re-entry tachycardia (AVRT)
• Wolff-Parkinson-White syndrome (subset of AVRT)
• Atrial tachycardia
• Junctional tachycardia

• Atrial fibrillation
• Frequent premature atrial contractions (PACs)
• Atrial flutter with variable block
• Multifocal atrial tachycardia (MAT)
• Sinus arrhythmia

• Ventricular tachycardia (VT)
• Supraventricular tachycardia with aberrancy (e.g., pre-existing bundle branch block, rate-related bundle branch block, or WPW)

• Torsades de pointes
• Frequent PVCs