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Mechanisms of Tachycardias

Mechanisms of Tachycardias. Abnormalities in impulse generation (automatic tachycardias) Abnormalites in impulse conduction (reentrant tachycardias). Clinical examples. Atrial fibrillation Reentrant PSVT Ventricular tachycardia/fibrillation. Atrial Fibrillation - causes. Atrial stretch

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Mechanisms of Tachycardias

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  1. Mechanisms of Tachycardias • Abnormalities in impulse generation (automatic tachycardias) • Abnormalites in impulse conduction (reentrant tachycardias)

  2. Clinical examples • Atrial fibrillation • Reentrant PSVT • Ventricular tachycardia/fibrillation

  3. Atrial Fibrillation - causes • Atrial stretch • High sympathetic tone • Idiopathic or “lone”

  4. Atrial fibrillation - complications • Worsened heart failure • Recurrences • Thromboembolism (CVA 3-5%/yr)

  5. Reentrant PSVT • AV Nodal Reentry • AV Reentry (WPW)

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