What is the step‑by‑step management of ventricular tachycardia (VT) under Advanced Cardiovascular Life Support (ACLS) and Basic Life Support (BLS) protocols?

Stepwise Management of Ventricular Tachycardia (VT) in ACLS/BLS

For pulseless VT, immediately begin high-quality CPR and defibrillate as soon as possible; for stable VT with a pulse, attempt synchronized cardioversion or antiarrhythmic medications; for unstable VT with a pulse, perform immediate synchronized cardioversion. 1

Initial Assessment (First 10 Seconds)

Check for pulse within 10 seconds while simultaneously assessing breathing:

• No pulse detected → Treat as pulseless VT (cardiac arrest)
• Pulse present → Determine if patient is stable or unstable

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Pathway 1: Pulseless VT (No Pulse) - BLS/ACLS

This is treated identically to ventricular fibrillation as a shockable rhythm.

BLS Protocol:

1. Immediately start CPR - 30 compressions: 2 breaths (single rescuer) or 15:2 (two rescuers in pediatrics)
2. Activate emergency response system and retrieve AED/defibrillator
3. Apply AED as soon as available
4. Deliver 1 shock when rhythm confirmed
5. Resume CPR immediately for 2 minutes without checking pulse
6. Recheck rhythm after 2 minutes and repeat cycle

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ACLS Protocol (Once Advanced Providers Arrive):

Continuous 2-minute cycles:

• Deliver shock (biphasic: 120-200 J initially, then equal or higher; monophasic: 360 J)
• Immediately resume CPR for 2 minutes
• Minimize interruptions in compressions (push hard at least 2 inches, rate 100-120/min)
• Change compressor every 2 minutes

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Drug therapy during CPR cycles:

• Epinephrine 1 mg IV/IO every 3-5 minutes (start after initial shock)
• Amiodarone 300 mg IV bolus for refractory VF/pVT (after 2nd or 3rd shock), then 150 mg if recurs
• Alternative: Lidocaine 1-1.5 mg/kg IV (first dose), then 0.5-0.75 mg/kg (second dose)

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Advanced airway management:

• Once placed: 1 breath every 6 seconds (10 breaths/min) with continuous chest compressions (no pausing)
• Use waveform capnography to confirm tube placement

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Pathway 2: VT With Pulse - Unstable Patient

Unstable signs include:

• Systolic BP <80 mmHg
• Altered mental status
• Chest pain
• Acute heart failure
• Signs of shock

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Management:

Perform immediate synchronized cardioversion - do not delay for IV access or medications

Energy levels:

• Use device-specific recommendations or maximum available energy if unknown
• Biphasic: typically 120-200 J initially
• Monophasic: 360 J

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If cardioversion fails:

• Check equipment connections
• Increase energy
• Change pad placement
• Consider antiarrhythmic medication then re-attempt

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Pathway 3: VT With Pulse - Stable Patient

Stable patients allow time for:

• 12-lead ECG
• IV access
• Medication administration

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Management Options:

Option 1: Synchronized cardioversion (reasonable first-line approach)

Option 2: Pharmacologic therapy (for monomorphic VT):

Procainamide (appears most effective):

• 20-50 mg/min IV until arrhythmia suppressed, hypotension occurs, QRS widens >50%, or max dose 17 mg/kg reached
• Maintenance: 1-4 mg/min
• Avoid if prolonged QT or CHF

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Amiodarone:

• 150 mg IV over 10 minutes
• Repeat if VT recurs
• Follow with maintenance infusion

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Sotalol (similar efficacy to procainamide):

• Alternative option for stable monomorphic VT

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Critical Pitfalls:

Never give verapamil for wide-complex tachycardia - it will not terminate VT and causes profound hypotension, potentially leading to cardiac arrest 2

Adenosine use:

• May be attempted for diagnostic purposes in stable, regular, monomorphic WCT
• Will terminate supraventricular tachycardias but not VT
• Can cause profound hypotension or precipitate VF in VT
• Have defibrillator immediately available

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Key Quality Measures Throughout:

CPR Quality (if pulseless):

• Depth: at least 2 inches (5 cm)
• Rate: 100-120/min
• Allow complete chest recoil
• Minimize interruptions (<10 seconds)
• Avoid excessive ventilation

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Monitor for ROSC:

• Return of pulse and blood pressure
• Abrupt sustained increase in PETCO₂ (≥40 mmHg)
• Spontaneous arterial pressure waves

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Address reversible causes (H's and T's):

• Hypovolemia, Hypoxia, Hydrogen ion (acidosis), Hypo/hyperkalemia, Hypothermia
• Tension pneumothorax, Tamponade, Toxins, Thrombosis (pulmonary/coronary)

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Special Considerations:

Refractory VT/Electrical Storm (≥3 episodes in 24 hours):

• Consider second-line antiarrhythmics if first agent fails
• Activate cardiac catheterization lab even without STEMI if refractory
• Mortality up to 14% in first 48 hours

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Important: Never co-administer multiple antiarrhythmic drugs (procainamide, amiodarone, sotalol) as their combined effects are arrhythmogenic 2