Optic Discs in Children With Cerebral Palsy
Hypothesis: Children born prematurely (between 8 and 9 months) with brain damage have an abnormal appearance of the optic nerve (nerve in eye) that resembles glaucoma (cupping) compared to those born before 8 months.
Purpose: to see how often children who are born prematurely and have suffered brain damage, have abnormal appearance of the optic nerve (nerve in the eye) which mimics glaucoma (cupping). This optic nerve cupping is most often seen when children are born after 8 months and is rarely seen in children born before 8 months.
Children born prematurely are known to have injuries to their brain as they are not yet fully developed. This often involves the part of the brain that involves vision. Clinicians have observed that these children have an abnormal appearance of the optic nerve (nerve in the eye), which has the appearance of glaucoma. These children often undergo extensive and often unnecessary invasive tests to rule out glaucoma. The investigators wish to establish the prevalence of this abnormality so that children are not subjected to unnecessary investigations. The investigators also want to understand how the optic nerve cupping (similar clinical picture as glaucoma) is related to the approximate timing and extent of the brain injury, the type of cerebral palsy and the motor disability of these children.
|Study Design:||Observational Model: Cohort
Time Perspective: Cross-Sectional
|Official Title:||Optic Nerve Head Morphology in Children With Perinatal Onset Static Encephalopathy|
- Optic Disc Cupping [ Time Frame: Initial examination ]
- Optic disc size [ Time Frame: Inital examination ]
|Study Start Date:||June 2008|
|Study Completion Date:||January 2009|
|Primary Completion Date:||January 2009 (Final data collection date for primary outcome measure)|
Children with birth/time of neurologic insult less than 28 weeks of gestation
Children with birth/time of neurologic insult at more than 28 weeks of gestation
This study will provide prevalence data on the occurrence of optic nerve head cupping in children with static encephalopathy in a much larger cohort than previously reported in literature (the largest cohort in literature is n=35). Children with a large optic nerve cup are treated as "glaucoma suspects". A routine glaucoma work-up in a child includes an examination under anesthesia or sedation, since children are unable to co-operate and stay still for accurate intraocular pressure measurements. These procedures often have to be periodically repeated and are a major financial burden. Importantly, they also carry substantial health risks, especially to the premature neonate who needs ICU monitoring after any anesthesia procedure. Roughly half of the children who undergo an examination under anesthesia for suspicion of glaucoma are found not to have the disease.
Children with a diagnosis of static encephalopathy attending the Pediatric Neurology clinic will be recruited. Interested patients will undergo a routine dilated eye examination after obtaining the consent and assent. The optic nerve head parameters (size, shape, color, cup-disc ratio, vessel tortuosity) will be recorded by 2 ophthalmologists experienced in the evaluation of the optic nerve. Some of the children (who are physically able to sit up in a chair and look straight ahead without blinking) will be offered disc photographs. This will be a one-time examination done during the routine clinic visit.
The prevalence of optic disc cupping (≥ 0.5) in a population of children with static encephalopathy with onset from 24-36 weeks will be obtained. Comparison of the cup/disc ratio in the 2 groups of children based on the approximate timing of the neurological insult will also be done.
The results of this study may allow pediatric ophthalmologists and glaucoma specialists to spare a child with static encephalopathy and isolated optic nerve head cupping extensive, risky and expensive glaucoma work-up.
This study will also provide more information on the patho-physiology of the developing visual nervous system.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00769197
|United States, Mississippi|
|University of Mississippi Medical Center|
|Jackson, Mississippi, United States, 39216|
|Principal Investigator:||Deepta Ghate, MD||University of Mississippi Medical Center|