Maintenance Dose of Atracurium for a 20 kg Child
For a 20 kg child, the maintenance dose of atracurium is 1.6-2.0 mg per dose (0.08-0.10 mg/kg), administered every 15-25 minutes as needed during prolonged surgical procedures. 1
Dosing Algorithm
Initial Bolus Dose
- Standard initial dose: 8-10 mg (0.4-0.5 mg/kg) for intubation 1
- Reduced initial dose: 6-8 mg (0.3-0.4 mg/kg) if using potent inhalation anesthetics (isoflurane/enflurane) or in patients with cardiovascular disease 1
Maintenance Dosing
- Dose: 1.6-2.0 mg (0.08-0.10 mg/kg) per dose 1
- Timing: First maintenance dose typically needed 20-45 minutes after initial bolus 1
- Frequency: Every 15-25 minutes under balanced anesthesia; slightly longer intervals (up to 30 minutes) under isoflurane or enflurane 1
- Higher maintenance doses: Up to 4 mg (0.2 mg/kg) can be used to extend dosing intervals 1
Continuous Infusion Alternative
If prolonged neuromuscular blockade is required:
- Initial infusion rate: 180-200 mcg/kg/min (10.8-12 mg/hr for 20 kg child) to rapidly counteract spontaneous recovery 1
- Maintenance infusion rate: 100-180 mcg/kg/min (6-10.8 mg/hr for 20 kg child) to maintain 89-99% blockade 1
- Research data suggests pediatric patients may require approximately 10.6 mg/hr (0.53 mg/kg/hr) for steady-state blockade 2
Critical Considerations
Anesthetic interactions: Atracurium is significantly potentiated by isoflurane and enflurane (approximately 35% increase in potency), requiring dose reduction by one-third when these agents are used 1. Halothane has minimal potentiating effect (approximately 20%) 1.
Monitoring: Use peripheral nerve stimulation to guide dosing and minimize risk of over- or under-dosing 1. Administer maintenance doses only after clinical evidence of recovery begins 1.
No cumulative effects: Unlike other neuromuscular blockers, atracurium does not accumulate with repeated dosing, allowing predictable regular dosing intervals 1.
Recovery characteristics: Recovery from complete blockade to 95% recovery takes approximately 30 minutes under balanced anesthesia and 40 minutes under volatile anesthetics 1.