BACKGROUND: Chiari I malformation is a rare disease characterized by cerebellar amygdalae descent under the level of the foramen magnum. It causes troubles in cerebrospinal fluid circulation and direct compression on brainstem, producing characteristic headaches, neurological impairment and syringomyelia. Surgery is the only treatment, indicated when symptomatology exists. However, sometimes patients complaint about atypical symptoms that are difficult to interpret.
We would like to study one of these atypical symptoms, gait imbalance, in a pediatric population thanks to a computerized dynamic posturography (Equitest).
METHOD: infants from 6 to 18 years of age presenting a radiologically confirmed Chiari I malformation will be included in the study. We will compare posturographic results of patients which will be operated on with the results of the patients which will not; furthermore, we will compare preoperative and postoperative results in operated patients.
RESULTS: 19 patients have been enrolled in the study, and data have been collected for 12 of them. Seven patients belong to operated population.
CONCLUSIONS: even if enrolment of the patients is satisfactory, disposable data are not enough to perform statistical analysis and to put forward any conclusion.
Chiari malformation is characterized by at least 5 mm descent of cerebellar tonsils below the foramen magnum, into the vertebral canal. Historical classification of this malformation consists in four different types, but it is the first one, due to a congenital small posterior fossa, which represent our focus of interest. Chiari malformation may leads to direct brainstem compression and to cerebrospinal fluid circulation trouble at this level, being cause of classical associated phenomena such as syringomyelia formation.
The clinical manifestation may be resumed as follow:
The only treatment for Chiari I malformation is the surgical one. It consists in an osteo-dural decompression of the posterior fossa. Surgical decision is formal when at least one of the following criteria is satisfied:
We decided to focalise about one of these symptoms, the gait instability, trying to find the link between Chiari malformation and postural control. In the literature, there are only one study concerning this aspect, conducted on an adult population with the help of a static posturography.
Our study will focus on pediatric patients, who will be evaluated by a dynamic posturography, the Equitest platform (NeuroCom, Clackamas, OR). This platform is able to quantify the contribution of each of the three sensory informations (visual, vestibular and somatosensory) necessary to maintain equilibrium, realising a specific test (Sensory Organisation Test).
The Equitest can elaborate a Composite Equilibrium Score (CES), that will be our PRIMARY JUDGMENT CRITERIA.
Only patients for which ENT evaluation is indicated for medical reasons (for example, children presented frequent falls, dizziness, nystagmus, motion sickness...) will be evaluated.
This evaluation won't change habitual neurosurgical care for the patients presenting Chiari I malformation, so two groups of patients will be identified: children who will be operated on and children who won't. CES of the two groups will be calculated and compared.
Furthermore, we will compared CES results of the operated patients group before and after surgery, to evaluate the impact of surgery on postural control.
In parallel, we will evaluate others SECONDARY CRITERIA in operated patient, before and after surgery, such as :
Clinical elements of recruited patients will be collected by principal investigator in an anonymous database, secured by a password.
Concerning primary criteria, collected qualitative data will be analysed by Chi-2 or Fischer test, while quantitative ones will be analysed by Student's test or Mann-Whitney one.
Concerning secondary criteria, collected qualitative data will be analysed by Mc Nemar test or symmetry test, while quantitative ones will be analysed by Student's test Wilcoxon one.
Condition | Pediatric, Chiari I Malformation |
---|---|
Treatment | Dynamic posturography |
Clinical Study Identifier | NCT04679792 |
Sponsor | Central Hospital, Nancy, France |
Last Modified on | 9 February 2023 |
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