Clozapine-related Immunodeficiency in Parkinsons Disease
Trial Parameters
Eligibility Fast-Check
Enter your details for a quick preliminary check. This does not replace medical advice.
Brief Summary
Clozapine is a second generation antipsychotic drug used in psychiatry to treat schizophrenia, affective disorders or certain symptoms of dementia. In neurology, clozapine is frequently used and recommended to manage symptoms of psychosis associated with Parkinson's disease (PD). The risk of neutropenia or agranulocytosis associated with clozapine estimated at 1.3% is well known to doctors around the world with a peak at one month and a decrease in risk after more than a year of treatment. This risk has led to the policy of "no blood, no drugs" and monitoring of the complete blood count (CBC) weekly for 18 weeks and then monthly for the duration of treatment. Some studies suggest an increased risk of infections related to immunodeficiency induced by clozapine itself. This clozapine-induced immunodeficiency would be comparable to that encountered in patients with common variable immunodeficiency or under immunosuppressive treatment. In addition, this immunosuppressive effect linked to clozapine would not be dose dependent but time dependent. However, the only studies currently performed have been in psychiatric patients treated for schizophrenia. It seems important to specifically explore clozapine-related immunodeficiency in PD patients treated with clozapine for PD-related psychosis. In this study, the investigators propose to evaluate the variations in serum immunoglobulin levels and lymphocyte subpopulations (B, T, NK) in parkinsonian patients treated with Clozapine at 6 months and 1 year after initiation of treatment.
Eligibility Criteria
Inclusion Criteria: * Patient ≥ 18 years old with Parkinson's disease according to MDS 2015 criteria * Psychotic symptoms requiring treatment with Clozapine * Patients with initially a normal leukocyte count (number of white blood cells ≥ 3500/mm3 \[3.5 x 109/l\] and an absolute neutrophil count PNN ≥ 2000/mm3 \[2 x 109/l\]) * patients in whom the number of white blood cells (WBC) and the absolute number of neutrophils (PNN) may be determined regularly at the following intervals: once a week during the first 18 weeks of treatment and, thereafter, at least every 4 weeks for the duration of the treatment. This monitoring must be continued throughout the treatment and for 4 weeks who follow the complete cessation of CLOZAPINE * Informed and written consent. * Affiliation to a social security system Exclusion Criteria: * Patients with a contraindication to the use of Clozapine according to the summary of product characteristics (SPC) * Hypersensitivity to the active substance or to any of