EKG

Atrial Tachycardia

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Atrial Tachycardia, Multifocal Atrial Tachycardia

  • Definition
  1. Form of Supraventricular Tachycardia (10% of cases) with increased automaticity
  • Pathophysiology
  1. Abnormal focus of atrial automaticity (outside the SA node)
  2. Unlike AVNRT and AVRT, no accessory pathway is involved
  1. Heart Rate 130 to 180 (up to 250)
  • Types
  1. Atrial Tachycardia
    1. Focal
    2. Macroentrant
  2. Multifocal Atrial Tachycardia
    1. Irregular narrow complex rhythm with 3 or more different P Wave morphologies
  • Causes
  • Multifocal Atrial Tachycardia
  1. Causes: Enlarged atrium
    1. Chronic lung disease
    2. Congestive Heart Failure
  2. Causes: Other
    1. Acid-base disturbance
    2. Electrolyte abnormalities
      1. Hypokalemia
      2. Hypomagnesemia