| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Disorders of consciousness as Unresponsive Wakefulness Syndrome (UWS) and Minimally Conscious State (MCS) after a coma due to acquired brain injury. Patients who emerged from the minimally conscious state (EMCS) |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Disorders of consciousness |  
| Troubles de l'état de conscience |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Nervous System Diseases [C10] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | Yes | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| This clinical trial aims to evaluate the efficacy of intravenous ketamine for the treatment of patients with disorders of consciousness (DoC) after a coma and assess the prevalence of responders. |  
| Cet essai clinique vise à évaluer l'efficacité de la kétamine par voie intraveineuse comme traitement pour les patients présentant des troubles de la conscience post-coma et mesurer la prévalence des répondeurs. |  | 
| E.2.2 | Secondary objectives of the trial | 
| This study aims to also better characterize the phenotype of potential good candidates to ketamine treatment and identify a set of
 biomarkers that correlate with responsiveness (or non-responsiveness)
 to the therapy, as well to help underpinning the neural networks underlying the modulating action of ketamine on consciousness and brain complexity.
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - More than 18 years old - Clinically stable, not dependent on medical ventilators for respiration
 - Diagnosed as an unresponsive wakefulness syndrome, a minimally conscious state, or emergent from the minimally conscious state according to the international criteria and based on at least 2 standardized behavioral assessments with the Simplified Evaluation of CONsciousness Disorders (SECONDs)
 - More than 28 days post-insult
 - Informed consent from a legal representative of the patient
 |  | 
| E.4 | Principal exclusion criteria | 
| - Known allergy or hypersensitivity to ketamine - Active epilepsy (contrary advice by a neurologist upon standard EEG)
 - A history of previous neurological functional impairment other than related to their acquired brain injury
 - A history of psychotic disorders (schizophrenia or bipolar disorder)
 - Use of drugs known to interact with ketamine. Among them: thyroid hormones, diazepam and barbitudes, drugs that interact with CYP3A4, other anesthetic like tramadol or anestethic halogen
 - Patient with coronary insufficiency
 - Other sympathomimetic drugs
 - Conditional exclusion criteria: contraindication to MRI, PET, or TMS (e.g., electronic implanted devices, external ventricular drain). In case of those, the participant would be included only for the techniques without contradiction.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Our main focus is on the link between consciousness and brain complexity. Thus, our primary endpoints are: 1. New signs of consciousness (e.g., response to command) measured by the SECONDs.
 2. Brain complexity measured by LZC and/or PCI in the ketamine session at the highest dose, compared to placebo and the baseline.
 
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| Two sessions separated by 5 days |  | 
| E.5.2 | Secondary end point(s) | 
| We will investigate the additional index of SECONDs, baseline biomarkers of (behavior and brain) responders, and effects on spasticity. As such, our secondary endpoints are: 1. The “additional index” (from 0 to 100) of the SECONDs;
 2. Baseline fMRI activity in the fronto-parietal network and the thalamo-cortical loop;
 3. Baseline metabolic PET level in the fronto-parietal network and the thalamo-cortical loop;
 4. EEG alpha connectivity measured via alpha centrality;
 5. Spasticity measured via the Modified Ashworth Score;
 6. Spasticity measured via EMG recording (H/M ratio);
 7. Range of Motion.
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| Recording with EEG done from 20 minutes before giving ketamine to a maximum of 90 minutes after the reached concentration of blood ketamine. |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | Yes | 
| E.6.13.1 | Other scope of the trial description | 
| Theoretical proof-of-concept for link between complexity and consciousness |  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | Yes | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | Yes | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 1 | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 2 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| Last follow-up phone call of the last subject |  
| Dernier appel téléphonique de suivi du dernier sujet |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 5 | 
| E.8.9.1 | In the Member State concerned months | 2 | 
| E.8.9.1 | In the Member State concerned days |  |