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Jiao S, Li N, Cao T, Wang L, Chen H, Lin C, Cai H. Differential impact of intermittent versus continuous treatment with clozapine on fatty acid metabolism in the brain of an MK-801-induced mouse model of schizophrenia. Prog Neuropsychopharmacol Biol Psychiatry 2024; 133:111011. [PMID: 38642730 DOI: 10.1016/j.pnpbp.2024.111011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 03/30/2024] [Accepted: 04/14/2024] [Indexed: 04/22/2024]
Abstract
Continuous antipsychotic treatment is often recommended to prevent relapse in schizophrenia. However, the efficacy of antipsychotic treatment appears to diminish in patients with relapsed schizophrenia and the underlying mechanisms are still unknown. Moreover, though the findings are inconclusive, several recent studies suggest that intermittent versus continuous treatment may not significantly differ in recurrence risk and therapeutic efficacy but potentially reduce the drug dose and side effects. Notably, disturbances in fatty acid (FA) metabolism are linked to the onset/relapse of schizophrenia, and patients with multi-episode schizophrenia have been reported to have reduced FA biosynthesis. We thus utilized an MK-801-induced animal model of schizophrenia to evaluate whether two treatment strategies of clozapine would affect drug response and FA metabolism differently in the brain. Schizophrenia-related behaviors were assessed through open field test (OFT) and prepulse inhibition (PPI) test, and FA profiles of prefrontal cortex (PFC) and hippocampus were analyzed by gas chromatography-mass spectrometry. Additionally, we measured gene expression levels of enzymes involved in FA synthesis. Both intermittent and continuous clozapine treatment reversed hypermotion and deficits in PPI in mice. Continuous treatment decreased total polyunsaturated fatty acids (PUFAs), saturated fatty acids (SFAs) and FAs in the PFC, whereas the intermittent administration increased n-6 PUFAs, SFAs and FAs compared to continuous administration. Meanwhile, continuous treatment reduced the expression of Fads1 and Elovl2, while intermittent treatment significantly upregulated them. This study discloses the novel findings that there was no significant difference in clozapine efficacy between continuous and intermittent administration, but intermittent treatment showed certain protective effects on phospholipid metabolism in the PFC.
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Affiliation(s)
- Shimeng Jiao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Nana Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Ting Cao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Liwei Wang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Hui Chen
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Chenquan Lin
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China
| | - Hualin Cai
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China; Institute of Clinical Pharmacy, Central South University, Changsha, China; International Research Center for Precision Medicine, Transformative Technology and Software Services, Hunan, China; National Clinical Research Center on Mental Disorders, Changsha, China.
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de Leon J. Promoting safer and wider worldwide use of clozapine. Schizophr Res 2024:S0920-9964(24)00096-3. [PMID: 38519290 DOI: 10.1016/j.schres.2024.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 03/10/2024] [Indexed: 03/24/2024]
Abstract
This issue focuses on the past, the present and the future of clozapine. Of the 43 clozapine articles, nine are historical articles dealing with the past, 29 deal with the present and five with laboratory assays which may influence its future use. These 43 articles include 219 different authors from 56 countries/regions and five continents.
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Affiliation(s)
- Jose de Leon
- Department of Psychiatry, University of Kentucky, Lexington, KY, USA; Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
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Prohens L, Rodríguez N, Segura ÀG, Martínez-Pinteño A, Olivares-Berjaga D, Martínez I, González A, Mezquida G, Parellada M, Cuesta MJ, Bernardo M, Gassó P, Mas S. Gene expression imputation provides clinical and biological insights into treatment-resistant schizophrenia polygenic risk. Psychiatry Res 2024; 332:115722. [PMID: 38198858 DOI: 10.1016/j.psychres.2024.115722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/21/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
Genome-wide association studies (GWAS) have revealed the polygenic nature of treatment-resistant schizophrenia TRS. Gene expression imputation allowed the translation of GWAS results into regulatory mechanisms and the construction of gene expression (GReX) risk scores (GReX-RS). In the present study we computed GReX-RS from the largest GWAS of TRS to assess its association with clinical features. We perform transcriptome imputation in the largest GWAS of TRS to find GReX associated with TRS using brain tissues. Then, for each tissue, we constructed a GReX-RS of the identified genes in a sample of 254 genotyped first episode of psychosis (FEP) patients to test its association with clinical phenotypes, including clinical symptomatology, global functioning and cognitive performance. Our analysis provides evidence that the polygenic basis of TRS includes genetic variants that modulate the expression of certain genes in certain brain areas (substantia nigra, hippocampus, amygdala and frontal cortex), which at the same time are related to clinical features in FEP patients, mainly persistence of negative symptoms and cognitive alterations in sustained attention, which have also been suggested as clinical predictors of TRS. Our results provide a clinical explanation of the polygenic architecture of TRS and give more insight into the biological mechanisms underlying TRS.
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Affiliation(s)
- Llucia Prohens
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain
| | - Natalia Rodríguez
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain; Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Àlex-Gonzàlez Segura
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain
| | - Albert Martínez-Pinteño
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain; Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - David Olivares-Berjaga
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain
| | - Irene Martínez
- Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Aitor González
- Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Gisela Mezquida
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain; Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain; Barcelona Clínic Schizophrenia Unit (BCSU), Neuroscience Institute, Hospital Clínic de Barcelona, Barcelona, Spain
| | - Mara Parellada
- Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain; Department of Child and Adolescent Psychiatry, Institute of Psychiatry and Mental Health, Hospital General Universitario Gregorio Marañón, IiSGM, Madrid, Spain; School of Medicine, Universidad Complutense, Madrid, Spain
| | - Manuel J Cuesta
- Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain; Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Miquel Bernardo
- Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain; Barcelona Clínic Schizophrenia Unit (BCSU), Neuroscience Institute, Hospital Clínic de Barcelona, Barcelona, Spain; Department of Medicine, University of Barcelona, Barcelona, Spain
| | - Patricia Gassó
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain; Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain
| | - Sergi Mas
- Department of Clinical Foundations, Pharmacology Unit, University of Barcelona, Barcelona, Spain; Institut d'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigación Biomédica en red en salud Mental (CIBERSAM), ISCIII, Spain.
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Kane JM, Schoretsanitis G, Rubio JM, Correll CU. Clozapine in treatment-resistant schizophrenia: Reflections from the Hallmark US clinical trial and beyond. Schizophr Res 2024:S0920-9964(24)00035-5. [PMID: 38290942 DOI: 10.1016/j.schres.2024.01.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 02/01/2024]
Affiliation(s)
- John M Kane
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA
| | - Georgios Schoretsanitis
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA; Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland.
| | - Jose M Rubio
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA
| | - Christoph U Correll
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA; Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany; German Center for Mental Health (DZPG), partner site Berlin, Germany
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Groenewald FCE, Kok RM. Side effects of clozapine in older adults with treatment-resistant schizophrenia compared to younger adults. Int J Geriatr Psychiatry 2024; 39:e6051. [PMID: 38180349 DOI: 10.1002/gps.6051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/19/2023] [Indexed: 01/06/2024]
Abstract
OBJECTIVES To study the differences in side effects of clozapine between older adults aged ≥55 years and younger adults aged 18-55 years with treatment-resistant schizophrenia. METHODS A retrospective cohort study in a large mental health institute in the Netherlands. All patients diagnosed with treatment-resistant schizophrenia who started with clozapine between 2011 and 2020 (N = 284) were included. We compared the number and type of side effects reported in the electronic patient files as well as the number of treatment discontinuations and the time until discontinuation, both due to side effects, of older adults versus younger adults. RESULTS In the younger age group (N = 183), the number of reported side effects was significantly higher in the first 3 months of treatment (Mann-Whitney U = 7341.5, p = 0.004) and after those 3 months (Mann-Whitney U = 5668.5, p < 0.001) compared with the number reported in the older age group (N = 101). Sedation, hypersalivation, dizziness, tachycardia, heartburn, nausea, weight gain, and constipation were reported significantly more often in the younger age group, and only extrapyramidal symptoms were reported significantly more often in the older age group. There was no significant difference in the number of treatment discontinuations due to side effects (23% vs. 21.8%, Chi-2 = 0.051, df = 1, p = 0.821) and time until discontinuation due to side effects (b = 0.091, SE = 0.335, p = 0.798) between younger and older adults. CONCLUSIONS Side effects of clozapine were reported significantly less often in older patients compared with younger patients. Older patients did not discontinue treatment due to side effects more often or earlier than younger patients. Older patients with schizophrenia may not be more vulnerable to side effects than younger adults.
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Affiliation(s)
| | - Rob M Kok
- Department Old Age Psychiatry, Parnassia Group, Den Haag, The Netherlands
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Clapham E, Reutfors J, Linder M, Brandt L, Sundström J, Bodén R. The association between exposure to clozapine, olanzapine, and quetiapine and the outcomes perimyocarditis and heart failure: A population-based cohort study. Psychiatry Res 2023; 326:115336. [PMID: 37451082 DOI: 10.1016/j.psychres.2023.115336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/28/2023] [Accepted: 07/06/2023] [Indexed: 07/18/2023]
Abstract
The risk of cardiac adverse events following clozapine use is debated and is unknown for the chemically related and widely used antipsychotics olanzapine and quetiapine. National Swedish registers were used to identify all patients 16-75 years old with antipsychotic dispensations between 2005 and 2018. The short-term outcome was a diagnosis of perimyocarditis (pericarditis and/or myocarditis) within two months of first dispensation, and the long-term outcome was heart failure (including cardiomyopathy) within three years. Cox regressions with time varying exposure were used to estimate hazard rates (HR) and their 95% confidence intervals (CI). A total of 201,045 individuals were included in the cohort. The risk of developing perimyocarditis during clozapine treatment tripled compared to no antipsychotic treatment (HR 3.4, CI 1.6-7.3), although the absolute rate remained comparably low. The long-term risk of heart failure during clozapine treatment was also elevated (HR 1.3, CI 1.1-1.7). Treatment with either or both olanzapine or quetiapine was not associated with an increased relative risk of perimyocarditis, or heart failure compared to no antipsychotic treatment. Clozapine use is therefore associated with a substantially elevated short-term risk of perimyocarditis and an increased risk of heart failure within three years.
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Affiliation(s)
- Eric Clapham
- Department of Medical Sciences, Psychiatry, Uppsala University, Sweden; Centre for Pharmacoepidemiology (CPE), Department of Medicine Solna, Karolinska University Hospital, Karolinska Institutet, Sweden.
| | - Johan Reutfors
- Centre for Pharmacoepidemiology (CPE), Department of Medicine Solna, Karolinska University Hospital, Karolinska Institutet, Sweden
| | - Marie Linder
- Centre for Pharmacoepidemiology (CPE), Department of Medicine Solna, Karolinska University Hospital, Karolinska Institutet, Sweden
| | - Lena Brandt
- Centre for Pharmacoepidemiology (CPE), Department of Medicine Solna, Karolinska University Hospital, Karolinska Institutet, Sweden
| | - Johan Sundström
- Department of Medical Sciences, Clinical Epidemiology, Uppsala University, Sweden; The George Institute for Global Health, University of New South Wales, Sydney, Australia
| | - Robert Bodén
- Department of Medical Sciences, Psychiatry, Uppsala University, Sweden
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Qubad M, Bittner RA. Second to none: rationale, timing, and clinical management of clozapine use in schizophrenia. Ther Adv Psychopharmacol 2023; 13:20451253231158152. [PMID: 36994117 PMCID: PMC10041648 DOI: 10.1177/20451253231158152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/24/2023] [Indexed: 03/31/2023] Open
Abstract
Despite its enduring relevance as the single most effective and important evidence-based treatment for schizophrenia, underutilization of clozapine remains considerable. To a substantial degree, this is attributable to a reluctance of psychiatrists to offer clozapine due to its relatively large side-effect burden and the complexity of its use. This underscores the necessity for continued education regarding both the vital nature and the intricacies of clozapine treatment. This narrative review summarizes all clinically relevant areas of evidence, which support clozapine's wide-ranging superior efficacy - for treatment-resistant schizophrenia (TRS) and beyond - and make its safe use eminently feasible. Converging evidence indicates that TRS constitutes a distinct albeit heterogeneous subgroup of schizophrenias primarily responsive to clozapine. Most importantly, the predominantly early onset of treatment resistance and the considerable decline in response rates associated with its delayed initiation make clozapine an essential treatment option throughout the course of illness, beginning with the first psychotic episode. To maximize patients' benefits, systematic early recognition efforts based on stringent use of TRS criteria, a timely offer of clozapine, thorough side-effect screening and management as well as consistent use of therapeutic drug monitoring and established augmentation strategies for suboptimal responders are crucial. To minimize permanent all-cause discontinuation, re-challenges after neutropenia or myocarditis should be considered. Owing to clozapine's unique efficacy, comorbid conditions including substance use and most somatic disorders should not dissuade but rather encourage clinicians to consider clozapine. Moreover, treatment decisions need to be informed by the late onset of clozapine's full effects, which for reduced suicidality and mortality rates may not even be readily apparent. Overall, the singular extent of its efficacy combined with the high level of patient satisfaction continues to distinguish clozapine from all other available antipsychotics.
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Affiliation(s)
- Mishal Qubad
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Goethe University, Frankfurt am Main, Germany
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Kawakita Y, Takeshima M, Komatsu T, Imanishi A, Fujiwara D, Itoh Y, Mishima K. Relationship between clozapine exposure and the onset of appendicitis in schizophrenia patients: a retrospective cohort study. BMC Psychiatry 2022; 22:653. [PMID: 36271340 PMCID: PMC9587653 DOI: 10.1186/s12888-022-04312-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 10/12/2022] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE Clozapine may cause serious side effects despite benefits in patients with schizophrenia. Thus, an accurate understanding of the side-effect profile of clozapine is extremely important in the management of its administration to patients with schizophrenia. Our aim was to validate the relationship between clozapine exposure and appendicitis onset in patients with schizophrenia. METHODS In this study, we retrospectively compared the incidence and cumulative incidence of appendicitis in patients with schizophrenia with and without a history of clozapine exposure. Among the patients with schizophrenia who visited our hospital between June 2009 and August 2021, we extracted those with a history of clozapine treatment. Patients with a history of taking clozapine were defined as the clozapine exposure group, while the others were defined as the clozapine non-exposure group. Patients with a history of appendectomy before their initial visit to our hospital or with a history of clozapine use at other hospitals were excluded. RESULTS There were 65 patients in the clozapine exposure group and 400 patients in the clozapine non-exposure group who met the inclusion criteria. The exposure group exhibited a remarkably higher incidence of appendicitis during the observation period than the non-exposure group (863 cases vs. 124 cases per 100,000 person-years). In particular, if limited to the period of clozapine exposure, the incidence of appendicitis is extremely high, at 2,086 cases per 100,000 person-years. Moreover, multivariable analysis showed that clozapine exposure was an independent factor contributing to the onset of appendicitis. CONCLUSIONS Clozapine exposure is associated with appendicitis onset in patients with schizophrenia.
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Affiliation(s)
- Yuta Kawakita
- Department of Neuropsychiatry, Akita City Hospital, 4-30 Kawamoto Matsuokamachi, Akita City, 010-0933, Japan. .,Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan.
| | - Masahiro Takeshima
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Tomonari Komatsu
- Department of Neuropsychiatry, Noshiro Kousei Medical Center, Akita, Japan
| | - Aya Imanishi
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Dai Fujiwara
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Yu Itoh
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Kazuo Mishima
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
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Skokou M, Karavia EA, Drakou Z, Konstantinopoulou V, Kavakioti C, Gourzis P, Kypreos KE, Andreopoulou O. Adverse Drug Reactions in Relation to Clozapine Plasma Levels: A Systematic Review. Pharmaceuticals (Basel) 2022; 15:817. [PMID: 35890117 PMCID: PMC9317288 DOI: 10.3390/ph15070817] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/22/2022] [Accepted: 06/27/2022] [Indexed: 11/16/2022] Open
Abstract
Clozapine is the gold standard for treatment-resistant schizophrenia. Serious and even life-threatening adverse effects, mostly granulocytopenia, myocarditis, and constipation, are of great clinical concern and constitute a barrier to prescribing clozapine, thus depriving many eligible patients of a lifesaving treatment option. Interestingly, clozapine presents variable pharmacokinetics affected by numerous parameters, leading to significant inter- and intra-individual variation. Therefore, therapeutic drug monitoring of plasma clozapine levels confers a significant benefit in everyday clinical practice by increasing the confidence of the prescribing doctor to the drug and the adherence of the patient to the treatment, mainly by ensuring effective treatment and limited dose-related side effects. In the present systematic review, we aimed at identifying how a full range of adverse effects relates to plasma clozapine levels, using the Jadad grading system for assessing the quality of the available clinical evidence. Our findings indicate that EEG slowing, obsessive-compulsive symptoms, heart rate variability, hyperinsulinemia, metabolic syndrome, and constipation correlate to plasma clozapine levels, whereas QTc, myocarditis, sudden death, leucopenia, neutropenia, sialorrhea, are rather unrelated. Rapid dose escalation at the initiation of treatment might contribute to the emergence of myocarditis, or leucopenia. Strategies for managing adverse effects are different in these conditions and are discussed accordingly.
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Brodeur S, Courteau J, Vanasse A, Courteau M, Stip E, Fleury MJ, Lesage A, Demers MF, Corbeil O, Béchard L, Roy MA. Association between previous and future antipsychotic adherence in patients initiating clozapine: real-world observational study. Br J Psychiatry 2022; 220:1-8. [PMID: 35082000 DOI: 10.1192/bjp.2022.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Although recognised as the most effective antipsychotic for treatment-resistant schizophrenia, clozapine remains underused. One reason is the widespread concern about non-adherence to clozapine because of poor adherence before initiating clozapine. AIMS To determine if prior poor out-patient adherence to treatmentbefore initiating clozapine predisposes to poor out-patient adherence to clozapine or to any antipsychotics (including clozapine) after its initiation. METHOD This cohort study included 3228 patients with schizophrenia living in Quebec (Canada) initiating (with a 2-year clearance period) oral clozapine (index date) between 2009 and 2016. Using pharmacy data, out-patient adherence to treatment was measured by the medication possession ratio (MPR), over a 1-year period preceding and following the index date. Five groups of patients were formed based on their prior MPR level (independent variable). Two dependent variables were defined after clozapine initiation (good out-patient adherence to any antipsychotics and to clozapine only). Along with multiple logistic regressions, state sequence analysis was used as a visual representation of antipsychotic-use trajectories over time, before and after clozapine initiation. RESULTS Although prior poor adherence to antipsychotics was associated with poor adherence after clozapine initiation, the absolute risk of subsequent poor adherence remained low, regardless of previous adherence level. Most patients adhered to their treatment after initiating clozapine (>68% to clozapine and >84% to any antipsychotics). CONCLUSIONS Despite the fact that poor adherence prior to initiating clozapine is widely recognised by clinicians as a barrier for the prescription of clozapine, the current study supports the initiation of clozapine in all eligible patients.
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Affiliation(s)
- Sébastien Brodeur
- Département de Psychiatrie et Neurosciences, Université Laval, Canada
| | - Josiane Courteau
- Groupe de recherche PRIMUS, Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Canada
| | - Alain Vanasse
- Groupe de recherche PRIMUS, Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Canada and Département de médecine de famille et de médecine d'urgence, Université de Sherbrooke, Canada
| | - Mireille Courteau
- Groupe de recherche PRIMUS, Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Canada
| | - Emmanuel Stip
- Département de Psychiatrie et d'Addictologie, Université de Montréal, Canada and Department of Psychiatry and Behavioral Science, College of Medicine and Health Science, United Arab Emirates University, United Arab Emirates
| | - Marie-Josée Fleury
- Institut universitaire en santé mentale, Université McGill, Canada and Département de Psychiatrie, Université McGill, Canada
| | - Alain Lesage
- Département de Psychiatrie et d'Addictologie, Université de Montréal, Canada and Centre de Recherche, Institut universitaire en santé mentale de Montréal (IUSMM), Canada
| | - Marie-France Demers
- Centre de Recherche CERVO, Canada and Faculté de pharmacie, Université Laval, Canada
| | | | | | - Marc-André Roy
- Département de Psychiatrie et Neurosciences, Université Laval, Canada andCentre de Recherche CERVO, Canada
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Peters E, Shamloo A, Lodhi RJ, Marcoux G, Jackson K, Halayka S, Balbuena L. Medication Gaps and Antipsychotic Polypharmacy in Previously Hospitalized Schizophrenia Patients: An Electronic Cohort Study in Three Canadian Provinces. Front Psychiatry 2022; 13:917361. [PMID: 35782434 PMCID: PMC9243750 DOI: 10.3389/fpsyt.2022.917361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 05/26/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Real world evidence about antipsychotics focuses on rehospitalization. Modeling the time course of pharmacotherapy would show patients' adherence to medications and physicians' adherence to medication guidelines. We aimed to calculate the cumulative time spent in second generation antipsychotics (SGAs), gaps, antipsychotic polypharmacy, and clozapine in discharged schizophrenia patients. METHODS Hospitalization and pharmacy dispensing data from 2008-2018 in Manitoba, Saskatchewan, and British Columbia were linked and an electronic cohort (N = 2,997) was created (mean follow-up: 49 months, SD = 38). Cohort members were required to have a minimum of 6 weeks medicated with aripiprazole, olanzapine, paliperidone, quetiapine, risperidone, or ziprasidone. RESULTS The multistate model predicted that schizophrenia patients accumulated 44 months in SGA monotherapy, 4 months in polypharmacy, 11 months in medication gaps and 17 days in clozapine over a 5-year period. The majority of transitions were between SGA and medication gap. Accumulated time in medication gaps was seven times as much as in clozapine. Each 10% delay in SGA initiation post-discharge was associated with a 2, 1, and 6% higher risk for polypharmacy (95% CI: 1.01-1.02), gap (95% CI: 1.01-1.01), and clozapine (95% CI: 1.04-1.08), respectively. INTERPRETATION Schizophrenia patients accumulated more time unmedicated and in polypharmacy compared to clozapine. Either treatment guidelines for schizophrenia are not followed, or real-world challenges hamper their implementation.
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Affiliation(s)
- Evyn Peters
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Arash Shamloo
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Rohit J Lodhi
- Department of Psychiatry, University of Western Ontario, London, ON, Canada
| | - Gene Marcoux
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Kylie Jackson
- Mental Health Outpatient Services, Saskatchewan Health Authority, Prince Albert, SK, Canada
| | | | - Lloyd Balbuena
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
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12
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Baig AI, Bazargan-Hejazi S, Ebrahim G, Rodriguez-Lara J. Clozapine prescribing barriers in the management of treatment-resistant schizophrenia: A systematic review. Medicine (Baltimore) 2021; 100:e27694. [PMID: 34766570 PMCID: PMC10545051 DOI: 10.1097/md.0000000000027694] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 09/30/2021] [Accepted: 10/20/2021] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Treatment-resistant schizophrenia is prevalent and difficult to manage, as patients fail multiple antipsychotic trials before being considered as treatment-resistant. Currently clozapine is the only Food and Drug Administration-approved pharmacotherapy for treatment-resistant schizophrenia but remains under-prescribed. The purpose of this study is to investigate recent literature on clozapine in order to identify barriers to prescribing clozapine and categorize the recommended solutions. METHODS We conducted a systematic review following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Using free text and the medical subject headings, we searched MEDLINE/PubMed electronic bibliographic database from 2017 until 2020. Eligible studies included peer-reviewed English language articles with multiple methodologies aiming to identify clozapine barriers in treatment-resistant schizophrenia. We used search terms combining clozapine AND treatment OR treatment-resistant schizophrenia AND barriers AND prescribing OR prescription OR prescriber. We merged search results in a citation manager software, removed duplicates, and screened the remaining articles based on the study eligibility criteria. RESULTS We retrieved 123 studies, however, only 10 articles exclusively met the study inclusion criteria for full text review. These studies represented 20 countries; 6 were exclusively conducted in the US. The top barriers delineated by the studies include: providers' lack of knowledge and training (n = 7), concern about side effects (n = 8), and poor adherence (n = 7). All studies described more than 1 barrier. Other barriers included prescriber-perceived barriers (n = 4), administrative barriers (n = 5), and other healthcare systems-related barriers (n = 3). Top recommendations to overcome clozapine prescription barriers included improving prescriber clozapine education/training, utilizing interdisciplinary teams and providing integrated care via clozapine clinics, and simplifying blood test monitoring. CONCLUSION Clozapine remains under-prescribed for patients with treatment-resistant schizophrenia due to multiple barriers related to the individual prescriber, system of care, and technology. It is recommended that by improving prescriber knowledge and training, use of integrated care, and use of technology that can enable continuous, real-time blood test monitoring, these barriers may be overcome.
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Affiliation(s)
- Anum Iqbal Baig
- College of Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA
| | - Shahrzad Bazargan-Hejazi
- College of Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA
- David Geffen School of Medicine, University of California at Los Angeles, CA
| | - Gul Ebrahim
- College of Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA
| | - Jaziel Rodriguez-Lara
- College of Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA
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13
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Siskind D, Sharma M, Pawar M, Pearson E, Wagner E, Warren N, Kisely S. Clozapine levels as a predictor for therapeutic response: A systematic review and meta-analysis. Acta Psychiatr Scand 2021; 144:422-432. [PMID: 34374073 DOI: 10.1111/acps.13361] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Clozapine levels may be a more useful predictor of therapeutic response than the dose, given the variability in clozapine metabolism between individuals. We therefore systematically reviewed and meta-analysed the impact of clozapine levels on response and/or relapse to provide guidance on optimal clozapine levels. METHODS We systematically searched PubMed, PsycInfo and Embase for studies exploring clozapine levels and response and/or relapse. Our primary meta-analysis was rates of response above and below clozapine level thresholds of 350 ng/ml and 600 ng/ml. Secondary analyses were undertaken of mean clozapine levels, dose and concentration/dose (C/D) ratio and response and/or relapse. A meta-regression by study duration was conducted. RESULTS Twenty studies met inclusion criteria. Clozapine levels above 350 ng/ml were associated with statistically significantly higher rates of response (OR 2.27 95% CI 1.40-3.67, p < 0.001), but not above 600 ng/ml (OR 1.40 95% CI 0.85-2.31, p = 0.19). Higher mean clozapine levels were associated with better rates of response (SMD 0.24, 95% CI 0.00-0.49, p = 0.05), and lower rates of relapse (SMD -0.72, 95% CI -1.26 to -0.19, p = 0.008). By contrast, neither clozapine dose nor C/D ratio was associated with differing rates of response. Similarly, study duration did not affect outcome. CONCLUSIONS Our findings are in keeping with current guidelines that recommend targeting clozapine levels above 350 ng/ml before augmentation is considered. As some clozapine associated ADRs are dose dependent, levels above 600 ng/ml may have an unfavourable risk-benefit ratio.
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Affiliation(s)
- Dan Siskind
- Metro South Addiction and Mental Health Service, Brisbane, QLD, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, QLD, Australia.,Physical and Mental Health Stream, Queensland Centre for Mental Health Research, Brisbane, QLD, Australia
| | - Meghna Sharma
- School of Clinical Medicine, University of Queensland, Brisbane, QLD, Australia.,Cairns Base Hospital, Cairns, QLD, Australia
| | - Mrinal Pawar
- School of Clinical Medicine, University of Queensland, Brisbane, QLD, Australia.,Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia
| | - Ella Pearson
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD, Australia
| | - Elias Wagner
- Department of Psychiatry and Psychotherapy, University Hospital, LMU Munich, Munich, Germany
| | - Nicola Warren
- Metro South Addiction and Mental Health Service, Brisbane, QLD, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, QLD, Australia.,Physical and Mental Health Stream, Queensland Centre for Mental Health Research, Brisbane, QLD, Australia
| | - Steve Kisely
- Metro South Addiction and Mental Health Service, Brisbane, QLD, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, QLD, Australia.,Physical and Mental Health Stream, Queensland Centre for Mental Health Research, Brisbane, QLD, Australia.,Departments of Psychiatry, Community Health and Epidemiology, Dalhousie University, Halifax, NS, Canada
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14
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de Filippis R, Gaetano R, Schoretsanitis G, Verde G, Oliveti CA, Kane JM, Segura-Garcia C, De Fazio P. Clozapine Management in Schizophrenia Inpatients: A 5-Year Prospective Observational Study of Its Safety and Tolerability Profile. Neuropsychiatr Dis Treat 2021; 17:2141-2150. [PMID: 34234440 PMCID: PMC8257059 DOI: 10.2147/ndt.s312095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 06/15/2021] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Clozapine is well known for its efficacy and clinical superiority compared to other antipsychotics in treatment-resistant schizophrenia (TRS). However, it is frequently underutilized worldwide because of its acute adverse events, as well as for its long-term cardiometabolic and hematological consequences. OBJECTIVE The aim of the study was to evaluate 5-year safety in chronic TRS inpatients with continuous clozapine use. METHODS Patients with TRS and clozapine treatment were evaluated for 5 years. All participants were assessed using the Brief Psychiatric Rating Scale (BPRS), Glasgow Antipsychotic Side-effect Scale for Clozapine (GASS-C), Social Performance Scale (PSP) and Short Portable Mental Status Questionnaire (SPMSQ). Clinical, cardiometabolic and hematological data were collected periodically. General linear models (GLM) repeated measures controlling for CLZ dose were utilized to determine differences in variables across the time. RESULTS Overall, 189 inpatients were screened for study participation. The final sample included twenty-one TRS patients (16 males, 76%) with an average age of 57.6 years, all with 5-year continuous use of clozapine (mean dose 266 mg/day). There was not a significant effect of time on BPRS (p=0.774), PSP (p=0.855) and SPMSQ (p=0.066); differences remained not significant after controlling for CLZ dose (p=0.585, p=0.467 and p=0.105, respectively). No changes were found in blood and clinical parameters except for red blood cell count, which decreased over time (p=0.024; η2= 0.952). Patients reported a significant BMI decrease (-8.98 kg, p=0.008) between baseline and 5 years last observation. CONCLUSION The findings show how the application of a structured dietary, clinical and therapeutic monitoring program in psychiatric care facilities could allow the safe and effective long-term cardiometabolic and hematological management of clozapine. The unique role that clozapine plays in the current treatment of patients with TRS requires greater clinical awareness. Although its acute and chronic side effects are notorious, its safety management is feasible and broadens its potential practical application.
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Affiliation(s)
- Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Raffaele Gaetano
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | | | - Giuseppe Verde
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | | | - John M Kane
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA
- Center for Psychiatric Neuroscience, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Cristina Segura-Garcia
- Psychiatry Unit, Department of Medical and Surgical Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Pasquale De Fazio
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
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15
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Gamón V, Hurtado I, Salazar-Fraile J, Sanfélix-Gimeno G. Treatment patterns and appropriateness of antipsychotic prescriptions in patients with schizophrenia. Sci Rep 2021; 11:13509. [PMID: 34188093 PMCID: PMC8241998 DOI: 10.1038/s41598-021-92731-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 06/14/2021] [Indexed: 02/06/2023] Open
Abstract
Schizophrenia is a chronic mental condition presenting a wide range of symptoms. Although it has a low prevalence compared to other mental conditions, it has a negative impact on social and occupational functions. This study aimed to assess the appropriateness of antipsychotic medications administered to schizophrenic patients and describe current treatment patterns for schizophrenia. A retrospective cohort study was conducted in all patients over the age of 15 with an active diagnosis of schizophrenia and treated with antipsychotics between 2008 and 2013 in the Valencia region. A total of 19,718 patients were eligible for inclusion. The main outcome assessed was inappropriateness of the pharmacotherapeutic management, including polypharmacy use. Altogether, 30.4% of patients received antipsychotic polypharmacy, and 6.8% were prescribed three or more antipsychotics. Overdosage affected 318 individuals (1.6%), and 21.5% used concomitant psychotropics without an associated psychiatric diagnosis. Women and people with a comorbid condition like anxiety or depression were less likely to receive antipsychotic polypharmacy. In contrast, increased polypharmacy was associated with concomitant treatment with other psychoactive drugs, and only in user on maintenance therapy, with more visits to the mental health hospital. Overall, we observed a high level of inappropriateness in antipsychotic prescriptions. Greater adherence to guidelines could maximize the benefits of antipsychotic medications while minimizing risk of adverse effects.
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Affiliation(s)
- Verónica Gamón
- Health Services Research Unit, Fundación Para el Fomento de La Investigación Sanitaria y Biomédica de la Comunidad Valenciana, FISABIO (the Valencia Foundation for the Promotion of Health and Biomedical Research), Valencia, Spain
| | - Isabel Hurtado
- Health Services Research Unit, Fundación Para el Fomento de La Investigación Sanitaria y Biomédica de la Comunidad Valenciana, FISABIO (the Valencia Foundation for the Promotion of Health and Biomedical Research), Valencia, Spain.
- Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC, ), Valencia, Spain.
| | - José Salazar-Fraile
- Community Mental Health Centre Pere Bonfill, Valencia, Spain
- Consorcio Hospital General, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Valencia, Spain
| | - Gabriel Sanfélix-Gimeno
- Health Services Research Unit, Fundación Para el Fomento de La Investigación Sanitaria y Biomédica de la Comunidad Valenciana, FISABIO (the Valencia Foundation for the Promotion of Health and Biomedical Research), Valencia, Spain
- Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC, ), Valencia, Spain
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16
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Schoretsanitis G, Kuzin M, Kane JM, Hiemke C, Paulzen M, Haen E. Authors' Reply to Suhas et al.: Comment on: "Elevated Clozapine Concentrations in Clozapine-Treated Patients with Hypersalivation". Clin Pharmacokinet 2021; 60:1077-1079. [PMID: 33899165 DOI: 10.1007/s40262-021-01022-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/25/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Georgios Schoretsanitis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Behavioral Health Pavilion, 7559 263rd Street, Glen Oaks, NY, 11004, USA.
- University Hospital of Psychiatry Zurich, Zurich, Switzerland.
| | - Maxim Kuzin
- Clienia Schloessli, Private Psychiatric Hospital and Academic Teaching Hospital of the University of Zurich, Oetwil am See, Zurich, Switzerland
| | - John M Kane
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Behavioral Health Pavilion, 7559 263rd Street, Glen Oaks, NY, 11004, USA
- Department of Psychiatry and Molecular Medicine, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
- Center for Psychiatric Neuroscience, The Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy and Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of Mainz, Mainz, Germany
| | - Michael Paulzen
- Alexianer Hospital Aachen, Aachen, Germany
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany
- JARA-Translational Brain Medicine, Jülich, Germany
| | - Ekkehard Haen
- Department of Psychiatry and Psychotherapy, Clinical Pharmacology, University of Regensburg, Regensburg, Germany
- Department of Pharmacology and Toxicology, University of Regensburg, Regensburg, Germany
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17
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Schoretsanitis G, Kuzin M, Kane JM, Hiemke C, Paulzen M, Haen E. Elevated Clozapine Concentrations in Clozapine-Treated Patients with Hypersalivation. Clin Pharmacokinet 2020; 60:329-335. [PMID: 33000411 DOI: 10.1007/s40262-020-00944-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/11/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Hypersalivation is a common, clozapine-related adverse drug reaction with a serious impact on quality of life. Pharmacokinetic correlates of clozapine-related hypersalivation have evaded attention. The purpose of this study was to compare pharmacokinetic parameters between clozapine-treated patients with vs. without hypersalivation from a large therapeutic drug monitoring database. METHODS Out of a large therapeutic drug monitoring dataset of clozapine-treated patients, we compared a group of patients with hypersalivation (n = 72) and a control group of patients without any adverse reactions in this regard (n = 323). Comparisons included plasma concentrations and concentrations-by-dose as well as demographic characteristics between groups. Post-hoc analyses were performed separately in smokers and non-smokers. We used the non-parametric Mann-Whitney U test and the chi-square test, while effects of confounders were assessed using a bootstrapping analysis of covariance. RESULTS Patients with hypersalivation had higher clozapine plasma concentrations and concentrations-by-dose (p < 0.001 for the Mann-Whitney U test in both cases). Groups did not differ regarding demographic characteristics except for clozapine daily dose and percentage of smokers (p = 0.005 for the Mann-Whitney U test and p = 0.028 for the chi-square test, respectively). There were fewer smokers across patients with hypersalivation compared with patients without and daily doses were higher in patients with hypersalivation. After analysis of covariance, differences remained for both plasma concentrations and concentrations-by-dose (p < 0.001 for both). Post hoc analyses in smokers and non-smokers separately reported similar findings. CONCLUSIONS Elevated clozapine plasma concentrations and higher concentrations-by-dose were observed in patients with hypersalivation. A potential role for therapeutic drug monitoring in the prevention or management of clozapine-related hypersalivation is suggested.
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Affiliation(s)
- Georgios Schoretsanitis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Behavioral Health Pavilion, 7559 263rd Street, Glen Oaks, NY, 11004, USA.
| | - Maxim Kuzin
- Clienia Schloessli, Private Psychiatric Hospital and Academic Teaching Hospital of the University of Zurich, Oetwil Am See, Zurich, Switzerland
| | - John M Kane
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Behavioral Health Pavilion, 7559 263rd Street, Glen Oaks, NY, 11004, USA.,Department of Psychiatry and Molecular Medicine, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA.,Center for Psychiatric Neuroscience, The Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy and Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of Mainz, Mainz, Germany
| | - Michael Paulzen
- Alexianer Hospital Aachen, Alexianergraben 33, 52062, Aachen, Germany.,Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany.,JARA, Translational Brain Medicine, Jülich, Germany
| | - Ekkehard Haen
- Department of Psychiatry and Psychotherapy, Clinical Pharmacology, University of Regensburg, Regensburg, Germany.,Department of Pharmacology and Toxicology, University of Regensburg, Regensburg, Germany
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18
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Barnes TRE, MacCabe JH, Kane JM, Delgado O, Paton C. The physical health and side-effect monitoring of patients prescribed clozapine: data from a clinical audit conducted in UK mental health services. Ther Adv Psychopharmacol 2020; 10:2045125320937908. [PMID: 32821377 PMCID: PMC7412922 DOI: 10.1177/2045125320937908] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/29/2020] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND In addition to mandatory haematological monitoring, treatment guidelines recommend routine monitoring of adverse effects and physical health in patients prescribed clozapine. METHODS NHS trusts/healthcare organisations participated in a clinical audit in the context of a UK quality improvement programme addressing clozapine-prescribing practice. RESULTS Data relating to 6948 adult patients prescribed clozapine were submitted by 63 NHS trusts/healthcare organisations. Of 481 patients treated with clozapine for up to 18 weeks, there was documented pretreatment screening of blood pressure, heart rate and ECG in at least 90%, and body weight, plasma lipids, plasma glucose/glycated haemoglobin (HbA1c) and physical examination in approximately 80%. During the first 2 weeks of clozapine treatment there was documented daily measurement of both heart rate and blood pressure in 82% and body temperature in 77%. In a subsample of 411 patients, of the 72% who had weekly side-effect assessments documented in the first month of treatment, a structured assessment tool had been used in 29%. Treatment monitoring up to 18 weeks included an ECG in 90%, C-reactive protein (CRP) or creatine kinase in 42%, and troponin or B-type natriuretic peptide (BNP) in 29%. In the 5908 patients prescribed clozapine for at least 1 year, blood pressure and body weight/body mass index were documented in at least 80%, plasma lipids in 78% and plasma glucose in 73%, with an ECG in 55%. Two-thirds were prescribed medication to manage side effects of clozapine and one third of those with a diagnosis of schizophrenia were prescribed a second antipsychotic medication. CONCLUSION The findings suggest that for most patients treated with clozapine in UK mental health services, physical health screening and side-effect monitoring follow recommended practice, but there was limited use of structured side-effect assessment tools. Monitoring for clozapine-induced myocarditis during the early risk period using markers of inflammation such as CRP, and cardiac damage such as troponin and BNP, was less consistent. This may partly reflect the variation in guideline recommendations for monitoring for myocarditis and partly the selected use of such tests when prompted by cardiac symptoms. The relatively common coprescription of medications for the majority of people on longer-term clozapine treatment may well further increase side-effect burden and physical health risks, reinforcing the need for continuing systematic monitoring.
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Affiliation(s)
- Thomas R. E. Barnes
- Division of Psychiatry, Imperial College London, 7th Floor Commonwealth Building, Du Cane Road, London W12 0NN, UK
| | - James H. MacCabe
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, UK, NIHR Biomedical Research Centre for Mental Health, South London, UK, and Maudsley NHS Foundation Trust, London, UK
| | - John M. Kane
- Department of Psychiatry, Zucker Hillside Hospital, New York, USA
| | - Oriana Delgado
- Prescribing Observatory for Mental Health, Centre for Quality Improvement, Royal College of Psychiatrists, London, UK
| | - Carol Paton
- Division of Psychiatry, Imperial College London, UK, and Prescribing Observatory for Mental Health, Centre for Quality Improvement, Royal College of Psychiatrists, London, UK
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19
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Affiliation(s)
- P F J Schulte
- Mental Health Service Noord-Holland-Noord, Heerhugowaard, The Netherlands.,Dutch Clozapine Collaboration Group, Alkmaar, The Netherlands
| | - J Bogers
- Dutch Clozapine Collaboration Group, Alkmaar, The Netherlands.,Mental Health Service Rivierduinen, Leiden, The Netherlands
| | - S R T Bond-Veerman
- Mental Health Service Noord-Holland-Noord, Heerhugowaard, The Netherlands.,Dutch Clozapine Collaboration Group, Alkmaar, The Netherlands
| | - D Cohen
- Mental Health Service Noord-Holland-Noord, Heerhugowaard, The Netherlands.,Dutch Clozapine Collaboration Group, Alkmaar, The Netherlands
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20
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de Filippis R, Soldevila-Matías P, De Fazio P, Guinart D, Fuentes-Durá I, Rubio JM, Kane JM, Schoretsanitis G. Clozapine-related drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome: a systematic review. Expert Rev Clin Pharmacol 2020; 13:875-883. [PMID: 32576056 DOI: 10.1080/17512433.2020.1787831] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
INTRODUCTION The Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) syndrome is a severe, multiorganic, and potentially life-threatening drug-induced hypersensitivity reaction, linked to several common drugs, including antiepileptics, antibiotics, and several psychotropic drugs, including clozapine. Due to the importance of clozapine in the management of treatment-resistant schizophrenia, a systematic review and characterization of clozapine-related DRESS syndrome is long overdue. AREAS COVERED This systematic review was conducted following PRISMA guidelines. PubMed, Embase, PsychINFO, and the Cochrane Library databases were independently reviewed up to 1 November 2019 for articles reporting clozapine-related DRESS syndrome cases. The RegiSCAR score system was applied to systematically characterize the clinical presentations of selected studies. EXPERT OPINION Clozapine-related DRESS syndrome was reported in six patients from four articles. Five patients received polypharmacy. Skin rash and liver involvement with elevated liver enzymes were very common. No fatal cases were found. Treatment mainly included clozapine discontinuation and immunosuppression. The mismatch between incidences of DRESS with other responsible drugs, the common misdiagnosis of this syndrome, and the fact that an extensive literature search only identified six cases suggests that clozapine-related DRESS may be overlooked. It is, therefore, necessary to optimize diagnostic strategies to identify immune-related side effects of clozapine.
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Affiliation(s)
- Renato de Filippis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health , Glen Oaks, NY, USA.,Psychiatric Unit, Department of Health Sciences, University Magna Graecia of Catanzaro , Catanzaro, Italy
| | - Pau Soldevila-Matías
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health , Glen Oaks, NY, USA.,Research Institute of Clinic University Hospital of Valencia (INCLIVA) , Valencia, Spain
| | - Pasquale De Fazio
- Psychiatric Unit, Department of Health Sciences, University Magna Graecia of Catanzaro , Catanzaro, Italy
| | - Daniel Guinart
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health , Glen Oaks, NY, USA.,Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra , Hempstead, NY, USA
| | - Inmaculada Fuentes-Durá
- Department of Personality, Assessment and Psychological Treatment, Faculty of Psychology, University of Valencia , Valencia, Spain
| | - Jose M Rubio
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health , Glen Oaks, NY, USA.,Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra , Hempstead, NY, USA.,Center for Psychiatric Neuroscience, Feinstein Institute for Medical Research , Manhasset, NY, USA
| | - John M Kane
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health , Glen Oaks, NY, USA.,Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra , Hempstead, NY, USA.,Center for Psychiatric Neuroscience, Feinstein Institute for Medical Research , Manhasset, NY, USA
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