II. Causes: By Frequency

  1. Non-organic such as Anxiety Disorder (31%)
  2. Atrial Fibrillation (16%)
  3. Supraventricular Tachycardia (10%)
  4. Medications or recreational drugs (6%)
  5. Systemic disease (4%)
  6. Structural heart disease (3%), esp. Mitral Valve Prolapse
  7. Ventricular Tachycardia (2%)

III. Causes: By Characteristics and Timing

IV. Causes: Cardiac

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