What is the primary diagnosis and recommended trauma assessment for an infant who has fallen from a height?

Diagnosis and Trauma Assessment for Infant Falls from Height

For infants who fall from a height, the primary diagnosis focuses on identifying traumatic brain injury (TBI) and skull fractures through systematic risk stratification using validated clinical decision rules, with head CT reserved for those meeting specific high-risk criteria.

Risk Stratification Using Clinical Decision Rules

The diagnosis begins with applying the PECARN (Pediatric Emergency Care Applied Research Network) clinical decision rules, which combine multiple risk factors to identify infants at increased risk for intracranial injury (ICI) 1:

High-Risk Factors for Infants <2 Years Old:

• Glasgow Coma Scale (GCS) score <15 1
• Altered mental status 1, 2
• Palpable skull fracture 1, 2
• Loss of consciousness 1
• Severe mechanism of injury 1
• Nonfrontal scalp hematoma 1

Infants meeting these high-risk criteria have approximately 4.4% risk of clinically important intracranial injury and require head CT imaging 2.

Critical Fall Height Threshold:

• Falls from ≥0.6 meters (2 feet), measured from the infant's head center of gravity, significantly increase risk of skull fracture or ICI 3
• No skull fractures or ICI were documented in witnessed falls <0.6 meters 3
• Falls from >90 cm carry 3.1-fold increased risk of TBI 4

Age-Specific Vulnerability

Infants <12 months, particularly those <3 months, are at substantially higher risk for TBI compared to toddlers:

• Infants ≤12 months have significantly higher rates of skull fractures (71% vs 39% in toddlers) despite similar injury severity 5
• Infants <1 month have the highest TBI rate at 8.5% 4
• Being <3 months old confers 3.1-fold increased risk of TBI 4

Specific Injury Patterns to Assess

Location of Head Impact:

Temporal/parietal or occipital impacts carry significantly higher risk of skull fracture/ICI compared to frontal impacts 3. Document the precise impact site during examination.

Surface of Impact:

Impact onto wood surfaces increases risk of skull fracture 3. The landing surface type must be documented.

Fall Circumstances Requiring Heightened Suspicion:

• Falls from caregiver's arms, particularly on stairs 3
• Weekend or holiday presentations 4
• Referral by another physician (4.6-fold increased TBI risk) 4

Critical Diagnostic Pitfalls

30% of infants with primary intracranial injury have no skull fracture, and 8% have neither skull fracture nor cranial soft tissue injury 5. Additionally, 11% of infants with skull fractures show no external scalp or facial soft tissue swelling 5.

Therefore, absence of external signs does not exclude significant intracranial injury—clinical decision rules must guide imaging decisions, not external examination alone.

Imaging Recommendations

Head CT Indications:

Head CT is indicated for infants meeting PECARN high-risk criteria 1, 2. CT provides rapid acquisition with excellent sensitivity for acute intracranial hemorrhage and fractures 2.

What NOT to Use:

• Skull radiographs should not be used as up to 50% of intracranial injuries occur without fracture, and radiographs miss many fractures 1, 6
• MRI is not routinely used in acute evaluation due to longer acquisition times, frequent need for sedation, and impracticality in emergency settings 1, 2
• Vascular imaging (CTA/MRA) is not standard unless specific clinical or imaging findings suggest vascular injury 2

Counseling Families About CT Risks

Discuss radiation risks with families, emphasizing that while CT carries small lifetime cancer risk, clinically important outcomes requiring neurosurgical intervention after minor head injuries are rare 1. The clinical evaluation balances the likelihood of potentially devastating complications against CT risks 1.

Additional Trauma Assessment

Extremity fractures are the most common injury pattern in pediatric falls from height, occurring more frequently than head injuries 6. Obtain radiographs of symptomatic extremities on a case-by-case basis rather than by protocol 6.

Cervical spine and chest radiographs should be obtained in the initial evaluation 6, with additional imaging (pelvis, thoracolumbar spine, abdomen) based on clinical findings rather than fall height alone 6.

Abuse Consideration

Approximately 3% of infant fall presentations involve abuse situations 4. Maintain heightened suspicion when the history is inconsistent with injury pattern, particularly in very young infants with severe injuries from reportedly low-height falls.