Coma
Conditions
Keywords
Default-mode network, Difussion tensor imaging, Cortical thickness, Coma, Vegetative state, Minimally conscious state, Neural correlate of consciousness
Brief summary
Several studies in healthy volunteers have suggested that the synchronized functional connectivity in the DMN (Deafult-Mode Network) would sustain the mental content at rest, and when required, a switch in the activity between the DMN and other networks involved in specific congnitive functions, would occur. This interaction permit to make the hypothesis, that baseline brain activity is likely to shape our ongoing stream of consciousness and could correlate with conscious perception. The investigators hypothesized that DMN connectivity strength would be related to the level of consciousness of brain-damaged patients. The investigators will follow severely brain-injured patient in coma. Clinical examination using standardized behavioural scales: FOUR score (Full Outline of UnResponsivess), Coma Recovery Scale-Revised); and brain imaging assessesments using MRI (functional and anatomical connectivity, cortical thickness) will be performed at: 3 to 30 (visit 1), and 60 (visit 2) days after insult. If patient recover a normal conscious state between 30 and 60 days, an additional clinical and brain imaging assessment will be performed to identify related changes in brain activity (visit 1\*) Monitoring of vital parameters will be performed in patients by a senior anaesthesiologist throughout the experiment.
Interventions
None listed
Sponsors
University Hospital, Toulouse
Association des Traumatisés du Crane et de la Face, Paris, France
Institut National de la Santé Et de la Recherche Médicale, France
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* Brain-damaged patients in coma (trauma or anoxic origin). * Male and female, ranging in age from 18 to 75 years.
Exclusion criteria
* Withdrawal of consent from the patients (or the persons having legal responsibility for them). * Sedation or general anaesthesia during assessement period (\< 24 hours). * MRI contraindications
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change of DMN resting state fMRI connectivity between 1 and 2 month after severe brain injury | VISIT1 = coma state (an expected average of 3 to 30 days after brain injury), VISIT2 = recovery phase (an expected average of 30 to 60 days). Finally, in case of full recovery during the recovery phase an additional assessment will be performed (VISIT1*) | To date, the functional significance of DMN resting state connectivity patterns remain unclear. We hypothesized that DMN connectivity strength would be related to the level of consciousness of non-communicative brain-damaged patients, as assessed by standardized behavioural scales (FOUR score, CRS-R). Furthermore, we expected that a disruption of functional connectivity in the DMN could predict brain-damaged patient's recovery. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Compare functional and structural DMN connectivity between 1 and 2 month after severe brain injury | VISIT1 = coma state (an expected average of 3 to 30 days after brain injury), VISIT2 = recovery phase (an expected average of 30 to 60 days). Finally, in case of full recovery during the recovery phase an additional assessment will be performed (VISIT1*) | Functional DMN connectivity will be investigated using probabilistic independent component analysis. Structural connectivity counterpart, will be assessed by diffusor tensor imaging and cortical thickness. |
Countries
France
Outcome results
None listed