Related Experiment Video
Updated: Jun 5, 2026
Cannula Implantation into the Cisterna Magna of Rodents
Published on: May 23, 2018
Insights on the Hydrodynamics of Chiari Malformation
Cyrille Capel1,2, Pauline Padovani1, Pierre-Henri Launois1
1Department of Neurosurgery, Hospital University Center of Amiens-Picardie, 80054 Amiens, France.
Insights
Chiari malformation type 1 (CMI) surgery impacts neurofluid dynamics. Postoperative phase contrast MRI shows reduced tonsil pulsatility and altered cerebrospinal fluid (CSF) flow, aiding in patient follow-up.
Area of Science:
- Neurosurgery
- Radiology
- Fluid Dynamics
Background:
- Cerebellar tonsil ptosis and syringomyelia are linked to hemohydrodynamic mechanisms.
- Chiari malformation type 1 (CMI) affects cerebrospinal fluid (CSF) and cerebral blood flow.
Purpose of the Study:
- To quantify CSF and cerebral blood flow changes in CMI patients.
- To evaluate the impact of CMI surgery on neurofluid dynamics.
Main Methods:
- Retrospective analysis of 21 adult CMI patients.
- Pre- and postoperative phase contrast MRI (PCMRI) scans.
- Analysis of intraventricular CSF, subarachnoid CSF, blood, and tonsil pulsatility.
Main Results:
- Preoperative, syringomyelia patients showed less jugular venous drainage.
- Postoperative, tonsil pulsatility significantly decreased (p=0.008).
- Postoperative, subarachnoid CSF pulsatility at the foramen magnum increased (p=0.02), with decreased venous flow amplitude and correction factor (p=0.004).
Conclusions:
- Phase-contrast MRI is valuable for postoperative CMI evaluation.
- PCMRI complements morphological imaging in assessing CMI surgical outcomes.
Background:
We propose that the appearance of a ptosis of the cerebellar tonsils and syringomyelia is linked to its own hemohydrodynamic mechanisms. We aimed to quantify cerebrospinal fluid (CSF) and cerebral blood flow to highlight how neurofluid is affected by Chiari malformations type 1(CMI) and its surgery.
Methods:
We retrospectively included 21 adult patients with CMI who underwent pre- and postoperative phase contrast MRI (PCMRI) during the period from 2001 to 2017. We analyzed intraventricular CSF, subarachnoid spaces CSF, blood, and tonsils pulsatilities.
Results:
In preoperative period, jugular venous drainage seems to be less preponderant in patients with syringomyelia than other patients (venous correction factor: 1.49 ± 0.4 vs. 1.19 ± 0.1, p = 0.05). After surgery, tonsils pulsatility decreased significantly (323 ± 175 μL/cardiac cycle (CC) vs. 194 ± 130 μL/CC, p = 0.008) and subarachnoid CSF pulsatility at the foramen magnum increased significantly (201 ± 124 μL/CC vs. 363 ± 231 μL/CC, p = 0.02). After surgery, we found a decrease in venous flow amplitude (5578 ± 2469 mm3/s vs. 4576 ± 2084 mm3/s, p = 0.008) and venous correction factor (1.98 ± 0.3 vs. 1.20 ± 0.3 mm3/s, p = 0.004).
Conclusions:
Phase-contrast MRI could be a useful additional tool for postoperative evaluation and follow-up, and is complementary to morphological imaging.
More Related Videos
14:59Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus
Published on: October 14, 2022
04:33Spinal Hernia Repair and Cauda Equina Repositioning After Lumbar Decompression under Three-Dimensional Microscopy: A Case Report and Literature Review
Published on: November 8, 2024
Related Concept Videos
01:14Increased Intracranial Pressure l: Introduction
01:29Increased Intracranial Pressure ll: Pathophysiology
01:22Cerebral Edema ll: Pathophysiology