#1 thing?
ventilate with 100% oxygen!

adrenalin
1 mcg/kg to treat hypotension IV
10 mcg/kg for cardiac arrest
repeat q3-5 min as needed

atropine
20 mcg/kg for symptomatic bradycardia
max dose 1 mg for child, 2 mg for adolescent

Bicarbonate
1-2 mEq IV guided by ABGs

Calcium chloride
10-20 mg/kg IV
0.1-0.2 ml/kg of a 10% solution

Calcium gluconate
30-60 mg/kg !V
0.3-0.6 mL/kg of a 10% solution

Adenosine
100 mcg/kg rapid IV bolus and flush (max 6 mg)
second dose 200 mcg/kg (max 12 mg)

Lidocaine
1 mg/kg IV
then followed by 20-50 mcg/kg/min by infusion pump

amiodarone
5 mg/kg 
max 300 mg
VF and VT

Procainamide
5-15 mg/kg IV loading dose over 30-60 min
then 20-80 mcg/kg/min by infusion pump.
ECG monitoring required
Caution: hypotension and prolonged QT may occur

Magnesium
25-50 mcg/kg (max 2 gm) for torsades de pointes