A 1-year-old boy is brought to the emergency department for evaluation of poor feeding, irritability, and sweating. The child is lethargic but arousable. He has labored breathing, very rapid pulses, and a dusky color. His respiratory rate is 68/min, heart rate 300/min, and blood pressure 70/45 mmHg. He has weak brachial pulses and absent radial pulses, a capillary refill of 6 seconds, SpO2 85% on room air, and good bilateral breath sounds. You administer high-flow oxygen and place the child on a cardiac monitor and see the rhythm shown here.The child has no history of congenital heart disease. IV access has been established. Which therapy is most appropriate for this child?
a) Administer adenosine 0.1 mg/kg IV rapid push
b) Consult with pediatric cardiology
c) Administer isotonic crystalloid fluid bolus of 20 mL/kg
d) Perform immediate defibrillation
