MCQ: Pulseless Ventricular Tachycardia in Children

Clinical Scenario:

A 10-year-old boy with dilated cardiomyopathy suddenly collapses in the pediatric intensive care unit. He is unresponsive, apneic, and has no palpable pulse. Cardiac monitoring shows a regular wide-complex tachycardia at 220 beats/min consistent with monomorphic ventricular tachycardia. High-quality CPR is initiated, oxygen is administered, and intravenous access is already established. What is the most appropriate next step in management?

A. Administer amiodarone intravenously before shock delivery

B. Administer epinephrine immediately

C. Deliver an unsynchronized defibrillation shock

D. Perform synchronized cardioversion

E. Start lidocaine infusion

Correct answer & Explanation:

Correct Answer

C. Deliver an unsynchronized defibrillation shock

Explanation: Pulseless Ventricular Tachycardia in Children

Pulseless ventricular tachycardia (pVT) in children is a shockable cardiac arrest rhythm managed using the same general algorithm as ventricular fibrillation (VF). In a child who is unresponsive, has no definite pulse, and has pVT on the monitor, initiate high-quality cardiopulmonary resuscitation (CPR), activate the resuscitation team, and prepare for immediate unsynchronized defibrillation. The recommended initial pediatric defibrillation dose is 2 J/kg.

Defibrillation should not be delayed to establish intravenous/intraosseous (IV/IO) access or administer medication. After the shock, resume CPR immediately for 2 minutes without pausing for an immediate pulse check, unless signs of return of spontaneous circulation (ROSC) appear. Reassess the rhythm at the next scheduled check and follow the pediatric shockable-rhythm algorithm. American Heart Association (AHA): Pediatric Advanced Life Support.

Subsequent Management

  • First shock: Deliver unsynchronized defibrillation at 2 J/kg.

  • Second shock: If VF/pVT persists after the CPR cycle and rhythm reassessment, deliver 4 J/kg.

  • Epinephrine: Give 0.01 mg/kg IV/IO (using 0.1 mg/mL solution; maximum single dose 1 mg), repeated every 3–5 minutes. Administer it during CPR according to the algorithm; do not delay defibrillation to give it.

  • Further shocks: For persistent VF/pVT, deliver subsequent shocks using the recommended pediatric algorithm and energy doses, commonly at least 4 J/kg, without exceeding 10 J/kg or the maximum adult dose.

  • Antiarrhythmic medication: For refractory VF/pVT, administer amiodarone 5 mg/kg IV/IO or lidocaine according to the pediatric resuscitation algorithm. Continue high-quality CPR and investigate reversible causes.

Follow the current AHA PALS algorithm and your institution’s resuscitation protocol for the exact sequence of shocks, medications, and energy doses.

Why the Other Options Are Incorrect

A. Administer amiodarone intravenously before shock delivery

Incorrect. Amiodarone is used for persistent or refractory VF/pVT, not as the initial intervention. Giving it before the first shock delays definitive treatment.

B. Administer epinephrine immediately

Incorrect as the first definitive intervention. Epinephrine is an important component of cardiac arrest management, but it must not delay defibrillation in pVT. Give it during CPR according to the shockable-rhythm algorithm.

D. Perform synchronized cardioversion

Incorrect. Synchronized cardioversion is generally used for selected tachyarrhythmias with a pulse, including unstable tachycardia when indicated. In pulseless VT, use unsynchronized defibrillation because there is no reliable pulse with which to synchronize the shock.

E. Start lidocaine infusion

Incorrect. Lidocaine is an alternative antiarrhythmic for refractory VF/pVT. It is not the first-line intervention before defibrillation.

Key Learning Point

Pulseless Ventricular tachycardia in children is also a shockable rhythm: start CPR and deliver unsynchronized defibrillation as soon as possible. The initial pediatric shock dose is 2 J/kg. Medications support resuscitation but must never delay the first shock.

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External Resources

  1. American Heart Association — CPR and ECC Guidelines

  2. American Heart Association — Pediatric Cardiac Arrest Algorithm

  3. European Resuscitation Council — Guidelines

References (Vancouver Style)

  1. Topjian AA, Raymond TT, Atkins D, Chan M, Duff JP, Joyner BL Jr, et al. Part 4: Pediatric Basic and Advanced Life Support: 2020 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation. 2020;142(16_suppl_2)–S523. doi:10.1161/CIR.0000000000000901.

  2. American Heart Association. 2025 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Available online.

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