Additional Arrhythmias

AV Block

  • First degree

  • Second degree

    • Mobitz 1 → Treat underlying condition, e.g.

      • Ischemia affecting AV node

      • Hypothyroidism

    • Mobitz 2 → Pacemaker

  • Third degree heart block → Pacemaker

Sinus Node Disease (Sick Sinus Syndrome)

  • Risk factors: Age > 60 years, CAD, hypothyroidism, medications

  • May present with persistent tachycardia, persistent bradycardia, or tachy-brady syndrome

  • Symptomatic patients: Refer for pacemaker placement

Torsades de Pointes

  • Polymorphic ventricular tachycardia

  • Risk factor: Electrolyte imbalance (e.g. hypokalemia), medications

  • Often progresses to ventricular fibrillation

  • Treat with magnesium