Amnesia Clinical Trial
Official title:
Longitudinal Monitoring of Cerebral Connectivity 3T MRI in Patients With a Transcient Global Amnesia
Verified date | August 2018 |
Source | Groupe Hospitalier Paris Saint Joseph |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
The transient global amnesia (IA) is defined clinically as a temporary suspension and
isolated from the ante and retrograde memory, totally regressing within 24 hours. The causes
of AI remain unknown. The diagnosis of IA is based on consensus clinical criteria including
the absence of associated location marks. In clinical practice, the MRI is often performed in
conjunction with clinical examination because it ensures the absence of differential
diagnoses, including stroke.
The visualization of MRI signal abnormalities related to AI directly dependent on the
completion time of the review in relation to the onset of symptoms. Typically, no signal
abnormality is visible in the hyperacute phase (ie D0-D1) while punctate appear hyperintense
on diffusion sequences in hippocampal structures from J2 to J7 to disappear completely. It
has been previously demonstrated that the use of higher values of b and / or a better spatial
resolution significantly increases the sensitivity of the broadcasting sequence for the
detection of these abnormalities hippocampal signal. At St. Joseph Hospital, Investigators
explore the AI suspected patients with diffusion tensor sequence (DTI) on our high resolution
3T MRI.
Compared to the classical diffusion sequence, DTI is characterized by the use of a greater
number of directions in which the diffusion gradients are applied. One advantage of this
technique is to be able to perform tractography of white matter fibers. Thus the "connectome"
is a new technique for post-processing of DTI images based tractography and to assess all the
networks of nerve fibers in the brain. By this technique, the values of average diffusivity
(MD) and fractional anisotropy (FA) can be measured along each of the studied nerve fibers.
Group studies thus become feasible to compare quantitatively healthy subjects and patients
groups in terms of structural differences within the connectome. The contribution of this
technique was recently highlighted in patients with temporal lobe epilepsy.
Status | Terminated |
Enrollment | 1 |
Est. completion date | December 31, 2018 |
Est. primary completion date | December 31, 2018 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility |
Inclusion Criteria: - Patients with a typical transient global amnesia - Sent for MRI as part of usual care protocol Exclusion Criteria: - Any contraindication of MRI - Atypical clinical and / or radiological - Other active disease of the Central Nervous System - Patients with a history of cerebral infarction |
Country | Name | City | State |
---|---|---|---|
France | Groupe Hopitalier Paris Saint Joseph Service de radiologie | Paris | Ile-de-France |
Lead Sponsor | Collaborator |
---|---|
Groupe Hospitalier Paris Saint Joseph |
France,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Assessment of change of connectivity graphs representative of the FA (fraction anisotropy) facts | Comparison of connectivity graphs representing the FA values between the three groups of subjects : normal subjects , patients explored J2, explored patients at 1 year | Day 2, 1 year | |
Primary | Assessment of change of connectivity graphs representative of the MD (mean diffusivity) facts | Comparison of connectivity graphs representing the MD values between the three groups of subjects : normal subjects , patients explored J2, explored patients at 1 year | Day 2, 1 year |
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