Идёт набор NCT06930261

Dopaminergic Disruption Induced by Traumatic Coma: Dopaminergic Pathways Abnormalities and Biomarkers of Recovery Using MRI and 18F-LBT-999 PET

Фаза II С лечением Coma, Traumatic

Ориентир для пациента и семьи

Простыми словами

Автоматическая сводка по структурированным данным реестра. Она помогает сориентироваться, но не заменяет официальный протокол или оценку врача.

Что изучают: В протоколе указаны: LBT-999.
Кому может быть актуально: Состояния в реестре: Coma, Traumatic. Базовые параметры: 18 лет — 65 лет · Все.
Что важно проверить: Возраст, диагноз и пол — только базовые ориентиры. Предыдущее лечение, анализы и другие обязательные условия указаны ниже в критериях участия.
Где проводится: Франция
Следующий шаг: Сохраните исследование, покажите его лечащему врачу и уточните актуальный статус у исследовательского центра. Расходы, документы и поездка →

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Официальное название

Dopaminergic Disruption Induced by Traumatic Coma: Multimodal Neuroimaging Approaches to Characterize Dopaminergic Pathways Using 18F-LBT-999 PET

Обзор

The neural correlates of consciousness have been studied at the macroscopic level. However, the neurochemical basis of these processes remains poorly understood. The mesocircuit theory challenges the cortico-centric view of consciousness. It highlights the role of subcortical regulation by dopaminergic circuits, including the ventral tegmental area and striatal loops. Experimental data show the importance of dopamine in consciousness recovery. Animal TBI studies link dopamine deficits to loss of consciousness and recovery. In humans, imaging studies show disrupted dopaminergic networks in chronic consciousness disorders. Yet, early-phase dopaminergic disruptions in acute coma remain underexplored. Molecular imaging with PET or SPECT offers insights into dopamine system disturbances. The novel radiotracer 18F-LBT-999 enables detailed imaging of dopaminergic circuits, providing better spatial resolution and quantification than SPECT. This proof of concept study aims to explore acute subcortical dopaminergic loop disruptions. It will combine 18F-LBT-999 PET with structural and functional MRI in post-traumatic coma. Methods : Patients with severe traumatic brain injury (TBI) admitted to the intensive care unit state will be evaluated within 30 days post-injury. Participants will undergo clinical assessment after sedation clearance and will be categorized into three groups: (1) TBI-COMA (severe TBI with persistent coma), (2) TBI-REC (severe TBI with recovery of command-following), and (3) healthy controls. All participants will undergo clinical evaluations, anatomical and functional MRI, and molecular imaging: 18F-LBT-999-PET. Neurological outcome (CRS-r scale), Disability rating scale (DRS), Quality of life (QUOLIBRI) and axtrapyramidal symptoms (MDS-UPDRS) will be assessed at 3 month. Primary Hypothesis: Acute post-traumatic severe TBI patients with persistent coma (TBI-COMA) show reduced presynaptic dopamine receptor levels in the striatum, compared to healthy controls. Secondary Hypotheses: * Dopaminergic disruptions correlate with the severity of consciousness impairment, differentiating TBI-COMA and TBI-REC groups. * Structural damage in the striatum and nigrostriatal tract, identified via MRI, aligns with dopaminergic abnormalities. * Multimodal imaging findings during the acute phase can predict long-term neurological and quality-of-life outcomes. * Characterizing structural, functional, and metabolic variations in dopaminergic networks may guide personalized pharmacological treatments.

Вмешательства

Препарат LBT-999
LBT-999 administration for PET imaging

Первичные конечные точки

Striatal 18F-LBT-999 binding potential [Срок оценки: 1 year after the end of inclusion]

Вторичные конечные точки (7)

Dopaminergic Network Binding (TBI-COMA vs Controls) [Срок оценки: 1 year after the end of inclusion]
Group Comparisons (TBI-COMA vs. TBI-REC): [Срок оценки: 1 year after the end of inclusion]
Structural and Functional Correlations [Срок оценки: 1 year after the end of inclusion]
Motor Behavioral Signatures [Срок оценки: 1 year after the end of inclusion]
Assessment of neurological recovery using the Coma recovery scale (CRS-R) [Срок оценки: 3, 6 and 12 months post TBI]
Assessment of neurological recovery using the Disability Rating Scale (DRS) [Срок оценки: 3, 6 and 12 months post TBI]
Measering the quality of life with the Quality of Life After Brain Injury scale (QOLIBRI). [Срок оценки: 1 year after the end of inclusion]

Критерии участия

Критерии включения

For All Participants:

Aged 18-65 years.
Affiliated with or beneficiary of a social security system.
Signed informed consent provided by the participant or a trusted representative (for patients).

For all TBI Participant

Hospitalized for a non-penetrating traumatic brain injury (TBI) occurring within the last 30 days, with traumatic coma (Glasgow Coma Scale (GCS) < 10 and motor score (M) < 6) at hospital admission.
Sedative treatments discontinued for more than 48 hours.
Clinically stable (no hemodynamic, respiratory, or metabolic instability requiring specific interventions that contraindicate medical transfer to the imaging center).

For the TBI-COMA Group:

\- Severe TBI characterized by prolonged coma, defined as an initial GCS < 10 with M < 6, and no recovery of consciousness at inclusion (GCS < 10 with M < 6).

For the TBI-REC Group:

Severe TBI characterized by prolonged coma, defined as an initial GCS < 10 with M < 6, with recovery of consciousness evidenced by simple command-following (GCS ≥ 10 with M = 6) at inclusion.
For Healthy Controls:

Matched by age (± 2 years) and sex to patients in the TBI-COMA group.

Критерии исключения

For All Participants:

Pregnant or breastfeeding women
Contraindications to MRI
Known allergy to the PET radiotracer or its excipients.
History of conditions affecting the dopaminergic system
Individuals under legal protection measures
Current treatment with dopaminergic agonists or antagonists.

For Patients Only:

Coma due to causes other than TBI.
Decompressive craniectomy resulting in anatomical alterations incompatible with standardized image analysis (e.g., midline shift > 2 cm).

For Healthy Controls Only: