Sedation Protocol for Infant Non-Contrast Head CT
For infants undergoing non-contrast head CT, first attempt the scan without sedation using feed-and-sleep techniques; if sedation is required, use oral pentobarbital (4-8 mg/kg) or intravenous pentobarbital (2-6 mg/kg) with appropriate monitoring per AAP guidelines. 1, 2
Initial Approach: Avoid Sedation When Possible
- Attempt non-sedated imaging first by timing the scan after feeding when the infant naturally falls asleep 3
- Non-contrast head CT is typically brief (under 5 minutes), making natural sleep feasible for many infants
- This avoids medication risks entirely, particularly important given concerns about anesthetic effects on the developing brain 1
When Sedation is Necessary
Drug Selection
Pentobarbital is the preferred agent:
Oral route (4-8 mg/kg): Use when no IV access is present and no IV contrast is needed 2
- Time to sedation: ~18 minutes
- Success rate: 99.5%
- Lower respiratory complication rate (0.2%) compared to IV route 2
IV route (2-6 mg/kg): Use when IV access already established 2, 4
Alternative agents (though less preferred for head CT):
- Chloral hydrate: No longer commercially available in liquid form; some institutions compound it 1
Critical Safety Requirements per AAP Guidelines
Pre-sedation assessment:
- Confirm ASA physical status I or II 1
- Special consideration for infants: Neonates and former preterm infants have immature hepatic/renal function requiring extended monitoring 1
- Former preterm infants have increased apnea risk 1
- Calculate maximum mg/kg dose before administration 1
Required personnel:
- Practitioner skilled in pediatric airway management and PALS-trained 1
- Dedicated sedation monitor (separate from person performing procedure) 6
- Personnel capable of vascular access immediately available 1
Monitoring requirements:
- Continuous pulse oximetry (required) 1
- Heart rate monitoring (required) 1
- Capnography (required for deep sedation, recommended for moderate) 1
- Blood pressure at appropriate intervals 1
- Respiratory rate 1
- Document vital signs every 5 minutes during sedation 1
Required equipment immediately available:
- Age-appropriate airway equipment (oral/nasal airways, bag-valve-mask, LMAs, laryngoscope, endotracheal tubes) 1
- Suction equipment 1
- Adequate oxygen supply 1
- Defibrillator 1
- Emergency medications 1
- Rescue cart properly stocked 1
Fasting Considerations
- For urgent head CT (trauma evaluation), do not delay for fasting 6
- Aspiration risk during procedural sedation is extremely low (only 9 deaths reported post-1984, none in healthy children) 6
- Assess recent oral intake but proceed based on clinical urgency 6
- Infants <12 months have established aspiration risk factors - consider this in risk-benefit analysis but do not routinely delay urgent imaging 6
Recovery and Discharge
- Monitor in dedicated recovery area with appropriate equipment and personnel 1
- Initial vital signs every 10 minutes until awakening, then may increase intervals 1
- Critical for infants in car seats: Prolonged-acting drugs may cause re-sedation and airway obstruction during transport 1
- Discharge time approximately 108 minutes regardless of pentobarbital route 2
- Two adults should accompany infants still in car safety seats 1
Common Pitfalls to Avoid
- Do not use promethazine in infants - black box warning for fatal respiratory depression in children <2 years 1
- Avoid long-acting agents (IM pentobarbital at higher doses, phenothiazines) due to unpredictable responses and re-sedation risk 1
- Do not proceed without immediately available rescue equipment - EMS availability does not replace on-site rescue capability 1
- Ensure proper weight-based dosing calculation before administration 1
Expected Complication Rates
With proper monitoring and pentobarbital use 2, 5:
- Mild hypoxia (SpO2 90-95%): 5-9%, typically self-resolving
- Severe complications: <1%
- Overall adverse events: <2%
- Sedation failure: <1%