ACLS: Tachycardia

3 questions

1. Is the patient in a sinus rhythm?
2. Is the QRS wide or narrow?
3. Is the rhythm regular or irregular?

Narrow

Algorithm for tachycardia with a pulse (Adapted from ACLS 2010)

Narrow Regular

See also Tachycardia (Narrow)

• Sinus tachycardia
  • Treat underlying cause
• SVT
  • Vagal maneuvers (convert up to 25%)
  • Adenosine 6mg IVP
    • Can follow with 12mg if initially fails
    • If adenosine fails, initiate rate control with CCB or BB
      • Diltiazem 15-20mg IV, followed by infusion of 5-15mg/hr
      • Metoprolol 5mg IVP x 3 followed by 50mg PO
  • Synchronized Cardioversion (50-100J)
    • Provide sedation prior to synchronized cardioversion if possible

Narrow Irregular

• MAT
  • Treat underlying cause (hypoK, hypomag)
• Sinus Tachycardia with frequent PACs
• A fib / A Flutter with variable conduction (see also Atrial Fibrillation with RVR)
  • Rate control with:
    • Diltiazem
    • MTP (good in setting of ACS)
    • Amiodarone (good in setting of hypotension, CHF)
    • Digoxin (good in setting of CHF)
  • Synchronized Cardioversion (120-200 J)

Wide

Wide Regular

• If pulseless: shock (unsynchronized 200J)
  • See Adult Pulseless Arrest
• If unstable: shock (synchronized 100J)
  • Hypotension, altered mental status, shock, ischemic chest discomfort, acute heart failure
• If stable:
  • Meds
    • Procainamide
      • 20-50mg/min; then maintenance infusion of 1-4mg/min x6hr
      • Treat until arrhythmia suppressed, QRS duration increases >50%, hypotension, Max 17mg/kg or 1 gram
      • Avoid if prolonged QT or CHF
    • Amiodarone
      • 150mg over 10min (repeat as needed); then maintenance infusion of 1mg/min x6hr
    • Adenosine
      • May be considered for diagnosis and treatment only if rhythm is regular and monomorphic
  • Synchronized Cardioversion (100J)

Wide Irregular

DO NOT use AV nodal blockers as they can precipitate V-Fib

1. A fib with preexcitation
   • 1st line - Electric Cardioversion
   • 2nd line - Procainamide, amiodarone, or sotalol
2. A fib with aberrancy
3. Polymorphic V-Tach / Torsades De Pointes
   • Give IV MgSO4
   • Emergent defibrillation (NOT synchronized)
   • Correct electrolyte abnormalities (esp hypoK, hypoMg)
   • Stop prolonged QT meds

See Also

• ACLS (Main)
• Tachycardia (Wide)
• Tachycardia (Narrow)
• SVT
• PALS: Tachycardia

External Links

• DDxOf: Simplified ACLS Algorithms

References

Authors

Ross Donaldson