The Role of Glutamatergic Function in the Pathophysiology of Treatment-resistant Schizophrenia

Inclusion criteria

• ✓. Aged 18 years old or older;
• ✓. Diagnosis of schizophrenia or other psychotic disorder (Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5);
• ✓. Treatment resistance according to the Treatment Response and Resistance in Psychosis (TRRIP) Working Group consensus criteria. This requires a PANSS score of more than 70 and the presence of at least one positive and one negative symptom rated as ≥ 4 on the Positive and Negative Syndrome Scale (PANSS) and at least moderate functional impairment on the Social and Occupational Function Assessment Scale (SOFAS) despite at least 2 adequate trials of different antipsychotics;
• ✓. On a stable dose of antipsychotic (no dose changes in the past 1 month);
• ✓. Able to give fully informed written consent and likely to comply with the requirements of the study, after reading the information and consent form, and after having the opportunity to discuss the study with the investigator or his delegate;
• ✓. Capacity to provide informed consent, as judged by an investigator and as assessed by the McArthur scale;
• ✓. Ability to communicate satisfactorily with the investigator and to participate in, and comply with the requirements of the entire study.

Exclusion criteria