Experience with surgical decompression of the Arnold-Chiari malformation in young infants with myelomeningocele
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Early surgical decompression for Arnold-Chiari malformation in infants with myelomeningocele is crucial. Prompt intervention can prevent irreversible neurological deficits and improve outcomes, though respiratory failure remains a risk.
Area of Science:
- Pediatric Neurosurgery
- Congenital Malformations
- Neurological Surgery
Background:
- Arnold-Chiari malformation is a severe congenital condition affecting infants.
- Myelomeningocele often co-occurs with Arnold-Chiari malformation, necessitating early intervention.
- Hydrocephalus requires adequate control before addressing hindbrain decompression.
Purpose of the Study:
- To evaluate the efficacy of hindbrain decompression in infants with Arnold-Chiari malformation.
- To identify clinical presentations and outcomes associated with this condition.
- To emphasize the importance of early diagnosis and surgical management.
Main Methods:
- Retrospective analysis of 45 infants with myelomeningocele and Arnold-Chiari malformation.
- All infants underwent laminectomy and dural opening for hindbrain decompression.
- Clinical presentation, surgical findings, and patient outcomes were documented.
Main Results:
- 31% of patients experienced rapid neurological deterioration within 2 weeks.
- Brainstem compression within the spinal canal was consistently observed.
- Survivors (62%) showed neurological improvement, with 24 achieving complete recovery.
- Respiratory failure was the primary cause of mortality (38%).
Conclusions:
- Early recognition of Arnold-Chiari malformation symptoms in infants is vital.
- Prompt decompressive laminectomy significantly improves neurological function and survival rates.
- Surgical management is essential for successful outcomes in this pediatric population.
Abstract:
Forty-five infants with myelomeningocele in whom hydrocephalus was absent or adequately controlled developed signs and symptoms of the Arnold-Chiari malformation before the age of 3 months. All of them underwent laminectomy and opening of the dura mater for hindbrain decompression. The clinical presentation included swallowing difficulty, apneic episodes, stridor, bronchial aspiration, arm weakness, and opisthotonos. Within 2 weeks of the initial clinical presentation, the neurological status of 14 patients (31%) deteriorated dramatically and culminated in irreversible neurological deficits. In all patients, compression of the brain stem occurred in the spinal canal. A transverse dural band constricting the dural sac at the C-1 level was noted in 41% of the patients, and a mild degree of arachnoidal adhesion was noted in 23%. The lowermost level of the cerebellar tongue or medullary kink was located at C-1 to C-4 in 28 cases and at C-5 to T-1 in 17 cases. Twenty-eight (62%) of the patients were alive and 17 (38%) had died at the last follow-up assessment. All survivors showed improvement of their overall neurological function. Twenty-four made a complete recovery. The majority of deaths were attributed to respiratory failure. Early recognition of symptoms and prompt decompressive laminectomy are essential for successful management of the Arnold-Chiari malformation in infants.