Magnetic Resonance Imaging Study on Patients With Hemifacial Spasm

Recruiting

• Conditions: Hemifacial Spasm; Magnetic Resonance Imaging
• Interventions: Device: Scanning with magnetic resonance imaging

• Registration Number: NCT04645277
• Lead Sponsor: First Affiliated Hospital Xi'an Jiaotong University

Brief Summary

Up to now, multiplanar reconstruction (MPR) has been widely used to detect the neurovascular compressions (NVC) on the patients with hemifacial spasm (HFS). However, due to lack of stereoscopic vision, this traditional method sometimes can not meet the requirement on identifying the details of NVC, especially when the aberrant vessels turn out to be veins not arteries. The three dimensional analytic techniques, such as curved planar reconstruction (CPR) and magnetic resonance virtual endoscopy (MRVE), may be helpful to improve the sensitivity and specificity on the demonstration of NVC with stereo and dynamic views, so as to assist the design of the surgical plan.

Furthermore, the frequent finding of NVC on MRI studies of asymptomatic patients incited the creation of several strict criteria for the imaging diagnosis of NVC: the vessel must cross perpendicular to the long axis of the nerve, the nerve must be deviated or indented at the root entry zoon (REZ) by the vessel. Alternatively, morphological measurement of the nerve may correlate with the severity of facial spasm due to atrophy of the nerve in most cases of HFS, and is likely secondary to the micro-structural abnormalities, such as axonal loss, demyelination, collagen deposition, etc. In this study, cross-sectional area (CSA) and volume (V) of the cisternal facial nerve will be assessed to determine whether it can be a useful biomarker for predicting the degree of HFS.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2020-11-20
• Study First Submitted QC: 2020-11-20
• Study First Posted: 2020-11-27
• Study Start: 2021-01-01
• Status Verified: 2024-02
• Last Update Submitted: 2024-02-22
• Last Update Posted: 2024-02-26
• Primary Completion: 2024-06-30
• Study Completion: 2024-12-30

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 60

Inclusion Criteria

• Primary HFS patients according to medical history and typical facial muscle spasms that are unilateral, involuntary, and had intermittent contractions innervated by the ipsilateral facial nerve. The patient has 1 year disease duration at least.

Exclusion Criteria

• Secondary causes of HFS, such as tumors or cysts compressing the facial nerve in the cerebellar pontine cistern; Precarious general health status; Percutaneous lesions or surgical treatments; Cardiac pacemaker or metal implants.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Patients with MRI using two dimensional reconstruction	Scanning with magnetic resonance imaging	-
Patients with MRI using three dimensional reconstruction	Scanning with magnetic resonance imaging	-

Primary Outcome Measures

Name	Time	Method
Sensitivity and Specificity of Detection of Neurovascular Compression by Multiplanar Reconstruction (MPR) Compared with Surgical Findings	2021.1-2023.1	Severity of neurovascular compression, which will be judged by MPR, is defined as follows: 1 = no compression; 2 = contact by a vessel; 3 = indentation by a vessel; and 4 = nerve displacement or distortion by a vessel, and the results of MPR need to be compared with the intraoperative findings to obtain the sensitivity and specificity, respectively.
Sensitivity and Specificity of Detection of Neurovascular Compression by Curved Planar Reconstruction (CPR) Compared with Surgical Findings	2021.1-2023.1	Severity of neurovascular compression, which will be judged by CPR, is the same criterion as that in the Outcome 1, and the results of CPR need to be compared with the intraoperative findings to obtain the sensitivity and specificity, respectively.
Sensitivity and Specificity of Detection of Neurovascular Compression by Magnetic Resonance Virtual Endoscopy (MRVE) Compared with Surgical Findings	2021.1-2023.1	Severity of neurovascular compression, which will be judged by MRVE, is the same criterion as that in the Outcome 1, and the results of MRVE need to be compared with the intraoperative findings to obtain the sensitivity and specificity, respectively.

Secondary Outcome Measures

Name	Time	Method
Change of Facial Nerve Cross Sectional Area (CSA) from Baseline to 3 years later	2021.1-2024.1	Baseline CSA (mm2) refers to the cross sectional area of the cisternal facial nerve prior to the surgical treatment. Meanwhile, the study endpoint is 3 years after the operation, which need another measurement of CSA.; The CSA is calculated at 5 mm from the entry of the facial nerve into the pons in an image plane perfectly perpendicular to the course of each nerve, which also need using a mouse-driven cursor in MIPAV software.
Change of Facial Nerve Volume (V) from Baseline to 3 years later	2021.1-2024.1	Baseline V (mm3) refers to the volume of the cisternal facial nerve prior to the surgical treatment. Meanwhile, the study endpoint is 3 years after the operation, which need another measurement of V.; Measurements of V will be performed using Medical Image Processing, Analysis, and Visualization software (MIPAV, http://mipav.cit.nih.gov/). The measurements start from the point where the nerves enter the pons to an imaginary demarcation made at the entrance of the nerves into internal acoustic meatus. The facial nerves are manually delineated in each traverse section. The V will be automatically calculated with the MIPAV software.

Trial Locations

Locations (1)

The First Affiliated Hospital of Xi'an Jiaotong University; 🇨🇳 Xi'an, Shaanxi, China