Changes in temporal flow characteristics of CSF in Chiari malformation Type I with and without syringomyelia: implications for theory of syrinx development

Clinical article

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Object

The pathogenesis of syringomyelia in association with Chiari malformation Type I (CM-I) is unclear. Studies of patients with CM-I have shown alterations in the CSF velocity profile using cardiac-gated cine phase-contrast MRI, and computational simulations have demonstrated that temporal features of the CSF pulse could contribute to syrinx development or enlargement. Few studies have reported temporal characteristics of the CSF profile, and few studies have reported on CM-I patients with and without syringomyelia separately. This study was performed to determine whether specific temporal features of the CSF flow profile may underlie the development or enlargement of a syrinx in patients with CM-I.

Methods

Ten healthy volunteers and 18 patients with CM-I with (8 patients) and without (10 patients) syringomyelia were studied using cardiac-gated cine phase-contrast MRI, measuring the maximum CSF velocities in the cranial and caudal directions, the timing of these maximums relative to the cardiac cycle time, the timing of caudal flow onset, timing of cranial flow onset, and the duration of caudal flow.

Results

The caudal CSF flow was significantly faster (p ≤ 0.01) and earlier (p < 0.02) in patients without syringomyelia than in healthy volunteers and patients with syringomyelia. There were no significant differences in the CSF velocities between patients with syringomyelia and healthy volunteers. Patients with CM-I who had syringomyelia had a significantly later start of caudal CSF flow (p < 0.01) and earlier maximum cranial velocity (p = 0.03) than healthy volunteers, but the relative durations of caudal and cranial flow were not significantly different between any of the groups.

Conclusions

The significantly earlier arrival and earlier peak velocity of caudal CSF flow may underlie the development of syringomyelia in patients with CM-I, and after a syrinx develops the CSF flow profile appears to stabilize.

Abbreviations used in this paper:CM-I = Chiari malformation Type I; SAS = subarachnoid space.

Article Information

Address correspondence to: Elizabeth C. Clarke, Ph.D., B.E., B.Sc., Biomechanics Laboratory, Level 10, Kolling Institute, Building 6, Royal North Shore Hospital, St. Leonards, New South Wales 2065, Australia. email: Elizabeth.clarke@sydney.edu.au.

Please include this information when citing this paper: published online March 15, 2013; DOI: 10.3171/2013.2.JNS12759.

© AANS, except where prohibited by US copyright law.

Headings

Figures

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    Example MR images obtained in a healthy control volunteer, showing the approximate alignment of the 4 cine phase-contrast MRI planes indicated by the white bars (tonsils, foramen magnum, mid-C2, and mid-C5) aligned perpendicular to the CSF flow (A), an example anatomical scan through the mid-C2 (B), and a magnified view of a mid-C2 level phase image (as indicated in B) depicting approximate locations of the 10 regions used for velocity analysis (C).

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    Representative CSF velocity profile from a healthy control volunteer (anterior, mid-C2) showing measurements collected for analysis.

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    Group marginal means with their 95% CIs (whiskers) from the repeated-measures ANOVA for parameters measured from the CSF velocity profiles of healthy participants (black bars), CM-I patients without syringomyelia (gray bars), and CM-I patients with syringomyelia (white bars). Parameters include maximum cranial and caudal CSF velocities (upper), and times at which the peak cranial and caudal CSF flow are maximum (lower), that is, times at which the CSF flow became cranial and caudal and the proportional duration of caudal CSF flow. Significant comparisons are indicated with an asterisk.

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