Papile Grading — IVH
| Grade | Description | Clinical Significance |
|---|---|---|
| I | Germinal matrix hemorrhage only (subependymal) — confined to the germinal matrix; no ventricular extension | Best prognosis; germinal matrix involutes by 34–36 weeks GA; most neurologically normal at follow-up |
| II | IVH without ventricular dilation — blood extends into the lateral ventricle but does not distend it | Intermediate prognosis; risk of post-hemorrhagic hydrocephalus |
| III | IVH with ventricular dilation — blood fills and distends the lateral ventricle | Significant risk of post-hemorrhagic hydrocephalus requiring intervention; worse neurodevelopmental prognosis |
| IV | IVH + periventricular hemorrhagic infarction (PVHI) — not true intraventricular extension | Highest severity; PVHI results from venous infarction of periventricular white matter due to compression/obstruction of terminal veins by the GMH; high risk of cerebral palsy, cognitive impairment, and death |
Grade IV is periventricular hemorrhagic infarction (PVHI), not "extension" of IVH into brain parenchyma. The mechanism is venous infarction — the large germinal matrix clot obstructs ipsilateral medullary veins, causing hemorrhagic venous infarction of the adjacent periventricular white matter. This distinction matters for counseling and prognosis.
Screening protocol: Cranial ultrasound in all preterm infants <32 weeks at 7–10 days of life (peak GMH/IVH onset is within the first 72h, but initial scan often obtained at 7–10 days). Repeat at 36 weeks corrected gestational age. More frequent scanning in high-risk infants (very low birth weight, hemodynamic instability, coagulopathy).
Post-Hemorrhagic Hydrocephalus
Ventricular dilation after IVH may be:
- Communicating — blood products obstruct CSF reabsorption at arachnoid granulations
- Obstructive — clot obstructs aqueduct or fourth ventricular outflow
Serial cranial ultrasound monitors ventricular index and anterior horn width. Progressive dilation despite conservative management → neurosurgical intervention (reservoir, ventriculoperitoneal shunt, or endoscopic third ventriculostomy).