Periventricular Leukomalacia (PVL)

Risk Factors & Pathogenesis

• Ischemic/inflammatory injury to the cerebral white matter in premature infants (< 32 weeks)
• Maternal chorioamnionitis and neonatal sepsis are strong independent risk factors
• Hypotension, hypocarbia (decreases cerebral blood flow), or significant hypoxic episodes

Diagnosis

• Head US: Bilateral periventricular echodensities initially (> 7 days), evolving into cystic lesions (cPVL) after 2-4 weeks
• MRI (near term-equivalent age): Gold standard for detecting non-cystic diffuse white matter injury
• No acute clinical signs; diagnosis relies entirely on neuroimaging

Management & Prognosis

• No specific medical treatment available once injury has occurred
• High risk for subsequent Cerebral Palsy (especially spastic diplegia)
• Intensive early intervention: physical therapy, occupational therapy, neurodevelopmental follow-up
• Visual impairment tracking (Cortical Visual Impairment - CVI)

Neurocritical Care & Monitoring

• Maintain strict midline head positioning, elevate head of bed 15-30 degrees to optimize venous return and minimize ICP.
• Phenobarbital dosing: 20 mg/kg IV loading dose (push rate < 1 mg/kg/min to avoid cardiovascular collapse).
• Continuous aEEG (Amplitude-integrated EEG) monitoring for minimum 72 hours for all encephalopathic infants.
• Minimal handling protocol: cluster nursing care, restrict visitors, reduce ambient noise and keep isolette heavily shielded from light.
• Assess anterior fontanelle fullness and head circumference daily.

Standardized Discharge & Follow-Up Criteria

• Adequate weight gain explicitly > 15-30g/day over a continuous 3-5 day period.
• Maintenance of temperature in an open crib with standard clothing for 48 hours.
• Successful completion of the 90-120 minute Infant Car Seat Challenge.
• Caregiver successfully completed CPR training, rooming-in, and independent medication administration.
• Referrals placed for High-Risk Infant Follow-Up Clinic, Early Intervention (PT/OT), and appropriate sub-specialists.

Diagnostic & Management Algorithm

• PVL Screening Protocol: [START] Premature Infant < 32 weeks -> [EVALUATE] Serial Head US weeks 1-4 -> [DECISION] Periventricular echodensities noted? -> [YES] Follow up MRI at term equivalent age -> [GOAL] Early intervention for CP

References

1. Khwaja O, Volpe JJ. Pathogenesis of cerebral white matter injury of prematurity. Arch Dis Child Fetal Neonatal Ed.