Cardiac Electrical Storm


Cardiac Electrical Storm, Ventricular Electrical Storm, Ventricular Tachycardia Storm, Ventricular Fibrillation Storm

  • Definitions
  1. Electrical Storm
    1. More than 3 episodes of serious ventricular Arrhythmia in 3 hours
      1. Sustained Ventricular Tachycardia
        1. Sustained VT lasts >30 sec or hemodynamic compromise
      2. Sustained Ventricular Fibrillation
      3. Appropriate Automatic Internal Cardiac Defibrillator (AICD) shocks
  • Epidemiology
  1. Incidence: 10-20% of those with AICD
  • Risk Factors
  • Multiple appropriate shocks or electrical storm
  • Evaluation
  1. General
    1. Confirm Wide Complex Tachycardia (versus SVT with abberancy)
      1. Do not use Calcium Channel Blocker for wide complex unless absolutely certain of SVT
    2. Evaluate for secondary causes (e.g. infection, Electrolytes, Creatinine, Hemoglobin, Troponin, drug levels)
    3. Confirm multiple appropriate shocks from AICD
      1. Deactivate device with magnet if inappropriate shocks
  2. Unstable Patient presenting in ongoing ventricular Arrhythmia
    1. See Ventricular Tachycardia Management in the Adult
    2. See Ventricular Tachycardia Management in the Child
    3. See Unstable Tachycardia
    4. See Reversible Causes of Cardiopulmonary Arrest
  3. Stable patient
    1. Interrogate AICD
    2. See Labs and EKG above
  1. See AICD Electrical Storm
  2. See Ventricular Tachycardia Management in the Adult
  3. See Ventricular Tachycardia Management in the Child
  4. Synchronized Cardioversion or Defibrillation
    1. First-line intervention
    2. Refractory to first shock
      1. Consider changing pad position
      2. Consider dual sequental Defibrillation
      3. Maximize delivered joules
  5. Avoid Epinephrine
    1. Increases sympathetic stimulation and may worsen electrical storm
  6. Specific Ventricular Tachycardias (if cardioversion or Defibrillation fails)
    1. Monomorphic Ventricular Tachycardia (regular Tachycardia with consistent QRS configuration)
      1. Typically due to old Myocardial Infarction scar
      2. Amiodarone
      3. Lidocaine
      4. Non-Selective Beta Blockers (e.g. Propranolol)
      5. Magnesium
      6. Radiofrequency ablation (if preserved EF, at least >25%)
    2. Polymorphic Ventricular Tachycardia
      1. Prolonged QTc (Torsades de Pointes)
        1. See Torsades de Pointes
        2. Magnesium Sulfate 2 grams or more loaded
        3. Isoproterenol
        4. Over-drive pacing
        5. Potassium Replacement if Hypokalemia
      2. Normal QTc
        1. Myocardial Ischemia
          1. Consider cath lab activation for coronary revascularization
        2. Brugada Syndrome
          1. Avoid Sodium Channel Blockers (e.g. Amiodarone, Procainamide, Lidocaine)
          2. Consider Isoproterenol
            1. If patient not currently in polymorphic Ventricular Tachycardia
          3. Quinidine (must be started before discontinuing Isoproterenol)
  • Resources
  1. Electrical Storm (First10EM)
    1. https://first10em.com/electrical-storm/
  2. Non-torsade VT/VF storm (EM:Crit - Internet Book of Critical Care)
    1. https://emcrit.org/ibcc/storm/