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Impact of Thyroxine Treatment on Myelination in Premature Neonates With Intraventricular Hemorrhage: An Magnetic
Praveen Ballabh1, Vincent Lee2, Edmund F LaGamma3
1Department of Pediatrics, Albert Einstein College of Medicine, Bronx, New York; Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York.
Insights
Thyroxine (T4) treatment may improve white matter recovery in premature infants with intraventricular hemorrhage (IVH). This pilot study showed reduced diffusivity in T4-treated neonates, suggesting enhanced myelination and neurological recovery.
Area of Science:
- Neonatal neurology
- Developmental neuroscience
- Neuroimaging
Background:
- Intraventricular hemorrhage (IVH) is a significant complication in premature infants, leading to long-term neurological deficits.
- Thyroxine (T4) treatment has shown promise in preclinical models for promoting oligodendrocyte development and myelination after IVH.
- Survivors of IVH often experience cerebral palsy, cognitive impairments, and neurobehavioral issues.
Purpose of the Study:
- To investigate the efficacy of thyroxine (T4) treatment in promoting white matter recovery in preterm neonates with grade III intraventricular hemorrhage (IVH).
- To evaluate white matter changes using magnetic resonance imaging-diffusion tensor imaging (DTI) metrics in neonates receiving T4 treatment.
Main Methods:
- A randomized pilot study involving preterm neonates (23-27 weeks gestation) with grade III IVH or periventricular echodensity.
- Participants were assigned to either T4 treatment (8 μg/kg/d for 42 days) or a no-treatment control group.
- Diffusion tensor imaging (DTI) was performed at 36 weeks postmenstrual age to assess white matter integrity.
Main Results:
- Recruitment and retention of preterm neonates with IVH in the T4 study were feasible.
- Seed-based tractography analysis revealed reduced mean, radial, and axial diffusivity in the splenium of T4-treated neonates compared to controls.
- These DTI metric changes suggest improved white matter integrity and myelination.
Conclusions:
- Thyroxine (T4) treatment appears to enhance white matter recovery and myelination in preterm neonates with moderate-to-severe IVH.
- This pilot study provides a foundation for a larger multicenter clinical trial to confirm these findings.
- T4 treatment holds potential for improving neurological outcomes in infants affected by IVH.
Background:
Intraventricular hemorrhage (IVH) remains a major complication of prematurity. Survivors of IVH suffer from cerebral palsy, cognitive deficits, and neurobehavioral disorders. Thyroxine (T4) treatment in preterm rabbits with IVH enhances the proliferation and maturation of oligodendrocytes, restoring myelination and neurological recovery. We hypothesized that T4 treatment of neonates with grade III IVH or periventricular echo density would promote white matter recovery, as evaluated by magnetic resonance imaging-diffusion tensor imaging metrics.
Methods:
We randomized preterm neonates with grade III IVH or periventricular echo- density (Volpe's IVH grading) of 230/7-276/7 weeks of gestation into T4 treatment and no treatment groups (n = 7, each arm). Neonates in the T4 group received thyroxine 8 μg/kg/d divided into two doses for 42 days. Magnetic resonance imaging with diffusion tensor imaging (DTI) was performed at 36 weeks postmenstrual age. The DTI analysis methods used for neonates with IVH were validated in 130 neonates previously diagnosed with IVH.
Results:
It is feasible to recruit and retain preterm neonates with IVH in a T4 treatment study. The semiautomated seed-based tractography analysis revealed that DTI metrics, including mean, radial, and axial diffusivity, were reduced in the splenium of T4-treated neonates compared with untreated controls.
Conclusions:
The data suggest that T4 treatment enhances white matter recovery and myelination in neonates with moderate-to-severe IVH. This pilot study establishes a solid foundation for confirming this effect through a large multicenter clinical trial in preterm neonates with IVH.
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