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Increased intracranial pressure after coronal suturectomy in craniosynostotic rabbits
M P Mooney1, W Fellows-Mayle, H W Losken
1Department of Anatomy and Histology, University of Pittsburgh, PA 15261, USA.
Insights
Surgical release of fused sutures may help intracranial hypertension in craniosynostosis. In rabbits, suturectomy normalized intracranial pressure (ICP) and age-related ICP changes, suggesting normal development post-surgery.
Area of Science:
- Pediatric Surgery
- Neurosurgery
- Developmental Biology
Background:
- Craniosynostosis, premature fusion of skull sutures, can lead to intracranial hypertension.
- Surgical intervention aims to relieve pressure, but outcomes vary.
- Understanding longitudinal intracranial pressure (ICP) changes is crucial for managing craniosynostosis.
Purpose of the Study:
- To investigate longitudinal changes in ICP in a rabbit model of coronal suture synostosis.
- To compare ICP in uncorrected, surgically corrected, and normal rabbits.
- To evaluate the effect of coronal suturectomy on ICP dynamics.
Main Methods:
- Utilized a rabbit model with familial bilateral coronal suture synostosis.
- Groups included normal controls, uncorrected synostosis, and post-suturectomy rabbits.
- ICP was measured using epidural microtransducers at 25 and 42 days of age.
Main Results:
- Uncorrected synostotic rabbits showed significantly higher ICP at 25 days.
- By 42 days, ICP in uncorrected rabbits decreased, while normal rabbits' ICP increased.
- Suturectomy in synostotic rabbits led to immediate ICP reduction and normalized age-related ICP patterns.
Conclusions:
- Coronal suturectomy in rabbits normalized ICP and age-related ICP changes.
- Post-suturectomy ICP rise may reflect normal development, not pathological recurrence.
- Further studies are needed to confirm long-term ICP stability and explore compensatory mechanisms.
Abstract:
It has been suggested that the complications associated with intracranial hypertension in craniosynostotic infants may be managed with surgical release of the synostosed sutures. However, both postoperative increases and decreases in intracranial pressure (ICP) have been reported in heterogeneous samples of infants with syndromic and nonsyndromic craniosynostoses. The present study was designed to describe longitudinal changes in ICP in a homogeneous sample of rabbits with uncorrected and corrected familial coronal suture synostosis and compare them with age-matched normal control rabbits. Fifty-three rabbits were divided into three groups: normal rabbits (n = 28), rabbits with uncorrected bilateral coronal suture synostosis (n = 9), and rabbits with bilateral coronal suture synostosis with coronal suturectomy at 25 days of age (n = 16). ICP was measured at 25 and 42 days of age using a Codman epidural microtransducer. Results revealed that rabbits with uncorrected craniosynostosis had significantly (P < 0.05) higher ICP at 25 days of age than normal control rabbits by approximately 86%. However, by 42 days of age, ICP in normal rabbits increased by 75%, whereas ICP in rabbits with uncorrected craniosynostosis decreased by 69% over the same time. Synostotic rabbits with coronal suturectomy showed a 50% decrease in ICP immediately after surgical release and then followed the normal, age-related ICP pattern, which significantly increased by 75% at 42 days of age. Results suggest that, in the rabbit model, the postsuturectomy rise in ICP may simply be normal, age-related changes, although a longer follow-up will be needed to determine the recurrence of pathological ICP. Possible multifactorial explanations for intracranial decompression and compensation in the craniosynostotic rabbit model are also discussed.