Clinical and Sociodemographic Characteristics of Young People With Early Psychosis: Comparing Cannabis Users and Non-Users in a Specialized Early Intervention Setting.

Λεπτομέρειες βιβλιογραφικής εγγραφής
Τίτλος: Clinical and Sociodemographic Characteristics of Young People With Early Psychosis: Comparing Cannabis Users and Non-Users in a Specialized Early Intervention Setting.
Συγγραφείς: Willert A; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany.; Department of Psychiatry and Psychotherapy, Charité Campus Mitte, Charité Universitätsmedizin Berlin, Berlin, Germany., von Hardenberg L; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany., Holzner L; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany., Kallenbach M; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany., Reichert E; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany., Bechdolf A; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany.; Department of Psychiatry and Psychotherapy, Charité Campus Mitte, Charité Universitätsmedizin Berlin, Berlin, Germany.; Deutsches Zentrum für Psychische Gesundheit (DZPG), Berlin-Potsdam, Germany., Leopold K; Department of Psychiatry, Psychotherapy and Psychosomatics, Vivantes Klinikum Am Urban and Vivantes Klinikum Im Friedrichshain, Berlin, Germany.; Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus, Technical University Dresden, Dresden, Germany.
Πηγή: Early intervention in psychiatry [Early Interv Psychiatry] 2026 Aug; Vol. 20 (8), pp. e70240.
Τύπος έκδοσης: Journal Article; Comparative Study
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Wiley-Blackwell Country of Publication: Australia NLM ID: 101320027 Publication Model: Print Cited Medium: Internet ISSN: 1751-7893 (Electronic) Linking ISSN: 17517885 NLM ISO Abbreviation: Early Interv Psychiatry Subsets: MEDLINE
Imprint Name(s): Original Publication: Carlton,VIC, Australia : Wiley-Blackwell
Ιατρικοί όροι (MeSH): Psychotic Disorders*/diagnosis , Psychotic Disorders*/epidemiology , Psychotic Disorders*/therapy , Psychotic Disorders*/psychology , Marijuana Abuse*/epidemiology , Psychoses, Substance-Induced*/diagnosis , Psychoses, Substance-Induced*/epidemiology , Psychoses, Substance-Induced*/therapy , Early Medical Intervention*, Humans ; Female ; Male ; Retrospective Studies ; Adult ; Adolescent ; Young Adult
Περίληψη: Background: Despite the high prevalence of comorbid cannabis use at first onset of psychotic symptoms, high transition rates from cannabis-induced psychosis to schizophreniform psychoses and bipolar disorder, and evidence of cannabis use as a risk factor in developing primary psychosis, only a few studies have addressed the difficulties in differential diagnosis focusing on the early stages of the disease.
Aims: The present study is the first to date to examine clinical and sociodemographic characteristics of individuals with early psychosis, comparing cannabis-induced psychotic disorder (CIPD), non-substance-induced psychotic disorder with concurrent cannabis use (NSIPD+C), and non-substance-induced psychotic disorder (NSIPD).
Method: A retrospective chart review of patients aged 18-35 with early psychosis who received inpatient treatment at FRITZ Early Intervention Center between December 2016 and September 2021 was conducted. Sociodemographic characteristics included age, biological sex, family history of psychiatric illness, migration background, living status, education/work status. Clinical characteristics included insight into illness, duration of untreated psychosis (DUP), social functioning, pathway to treatment, treatment motivation, treatment recommendation, and type of discharge.
Results: Of 509 participants, 42.6% had a diagnosis of NSIPD, 33.3% of CIPD, 7% of NSIPD+C. NSIPD had a significantly longer treatment duration compared to CIPD, a higher treatment motivation, and a higher discharge in accordance with clinicians' recommendation compared to both CIPD and NSIPD+C. No significant group differences were found in sociodemographic characteristics, DUP, and functioning scores.
Conclusions: The examined sociodemographic parameters as well as level of functioning and DUP do not aid in the differential diagnostic classification when cannabis use and psychotic symptoms occur simultaneously. The absence of differences in DUP across diagnoses may reflect the efficacy of low-threshold access provided by FRITZ and further supports the need for comprehensive implementation of early intervention services.
(© 2026 The Author(s). Early Intervention in Psychiatry published by John Wiley & Sons Australia, Ltd.)
References: Addington, J., and D. Addington. 2007. “Patterns, Predictors and Impact of Substance Use in Early Psychosis: A Longitudinal Study.” Acta Psychiatrica Scandinavica 115, no. 4: 304–309. https://doi.org/10.1111/j.1600‐0447.2006.00900.x.
APA. 1987. Diagnostic and Statistical Manual: Mental Disorders: DSM‐III‐R. 3rd ed. American Psychiatric Association.
Archie, S., B. R. Rush, N. Akhtar‐Danesh, et al. 2007. “Substance Use and Abuse in First‐Episode Psychosis: Prevalence Before and After Early Intervention.” Schizophrenia Bulletin 33, no. 6: 1354–1363. https://doi.org/10.1093/schbul/sbm011.
Bechdolf, A., K. Leopold, A. Lehmann, and E. Burkhardt. 2021. Junge Menschen mit Psychosen begleiten. Das Praxishandbuch zum FRITZ. Psychiatrie Verlag.
Bird, V., P. Premkumar, T. Kendall, C. Whittington, J. Mitchell, and E. Kuipers. 2010. “Early Intervention Services, Cognitive‐Behavioural Therapy and Family Intervention in Early Psychosis: Systematic Review.” British Journal of Psychiatry 197, no. 5: 350–356. https://doi.org/10.1192/bjp.bp.109.074526.
Carra, G., C. Battaglia, M. Hinton, L. Sheridan Rains, C. Crocamo, and S. Johnson. 2018. “Social Network Confidants, Duration of Untreated Psychosis and Cannabis Use in People With First Episode Psychosis: An Exploratory Study.” Early Intervention in Psychiatry 12, no. 5: 942–946. https://doi.org/10.1111/eip.12476.
DGPPN. 2019. S3‐Leitlinie Schizophrenie.
Di Forti, M., A. Marconi, E. Carra, et al. 2015. “Proportion of Patients in South London With First‐Episode Psychosis Attributable to Use of High Potency Cannabis: A Case‐Control Study.” Lancet Psychiatry 2, no. 3: 233–238. https://doi.org/10.1016/S2215‐0366(14)00117‐5.
Di Forti, M., D. Quattrone, T. P. Freeman, et al. 2019. “The Contribution of Cannabis Use to Variation in the Incidence of Psychotic Disorder Across Europe (EU‐GEI): A Multicentre Case‐Control Study.” Lancet Psychiatry 6, no. 5: 427–436. https://doi.org/10.1016/S2215‐0366(19)30048‐3.
Early Psychosis Guidelines Writing Group. 2016. Australian Clinical Guidelines for Early Psychosis. Orygen, The National Centre of Excellence in Youth Mental Health.
Fusar‐Poli, P., M. Cappucciati, G. Rutigliano, et al. 2016. “Diagnostic Stability of ICD/DSM First Episode Psychosis Diagnoses: Meta‐Analysis.” Schizophrenia Bulletin 42, no. 6: 1395–1406. https://doi.org/10.1093/schbul/sbw020.
Gomez‐Sanchez‐Lafuente, C., J. Guzman‐Parra, J. Suarez‐Perez, A. Bordallo‐Aragon, F. Rodriguez‐de‐Fonseca, and F. Mayoral‐Cleries. 2022. “Trends in Psychiatric Hospitalizations of Patients With Dual Diagnosis in Spain.” Journal of Dual Diagnosis 18, no. 2: 92–100. https://doi.org/10.1080/15504263.2022.2053770.
Grech, A., J. Van Os, P. B. Jones, S. W. Lewis, and R. M. Murray. 2005. “Cannabis Use and Outcome of Recent Onset Psychosis.” European Psychiatry 20, no. 4: 349–353. https://doi.org/10.1016/j.eurpsy.2004.09.013.
Guy, W. 1976. ECDEU Assessment Manual for Psychopharmacology. US Department of Health, Education, and Welfare Public Health Service Alcohol, Drug Abuse, and Mental Health Administration.
Hasan, A., R. von Keller, C. M. Friemel, et al. 2020. “Cannabis Use and Psychosis: A Review of Reviews.” European Archives of Psychiatry and Clinical Neuroscience 270, no. 4: 403–412. https://doi.org/10.1007/s00406‐019‐01068‐z.
Howes, O. D., T. Whitehurst, E. Shatalina, et al. 2021. “The Clinical Significance of Duration of Untreated Psychosis: An Umbrella Review and Random‐Effects Meta‐Analysis.” World Psychiatry 20, no. 1: 75–95. https://doi.org/10.1002/wps.20822.
Kamali, M., O. McTigue, P. Whitty, et al. 2009. “Lifetime History of Substance Misuse in First‐Episode Psychosis: Prevalence and Its Influence on Psychopathology and Onset of Psychotic Symptoms.” Early Intervention in Psychiatry 3, no. 3: 198–203. https://doi.org/10.1111/j.1751‐7893.2009.00133.x.
Large, M., S. Sharma, M. T. Compton, T. Slade, and O. Nielssen. 2011. “Cannabis Use and Earlier Onset of Psychosis: A Systematic Meta‐Analysis.” Archives of General Psychiatry 68, no. 6: 555–561. https://doi.org/10.1001/archgenpsychiatry.2011.5.
Lincoln, C., S. Harrigan, and P. D. McGorry. 1998. “Understanding the Topography of the Early Psychosis Pathways. An Opportunity to Reduce Delays in Treatment.” British Journal of Psychiatry 172, no. 33: 21–25.
Marconi, A., M. Di Forti, C. M. Lewis, R. M. Murray, and E. Vassos. 2016. “Meta‐Analysis of the Association Between the Level of Cannabis Use and Risk of Psychosis.” Schizophrenia Bulletin 42, no. 5: 1262–1269. https://doi.org/10.1093/schbul/sbw003.
Mauri, M. C., L. S. Volonteri, I. F. De Gaspari, A. Colasanti, M. A. Brambilla, and L. Cerruti. 2006. “Substance Abuse in First‐Episode Schizophrenic Patients: A Retrospective Study.” Clinical Practice and Epidemiology in Mental Health 2: 4. https://doi.org/10.1186/1745‐0179‐2‐4.
Murrie, B., J. Lappin, M. Large, and G. Sara. 2020. “Transition of Substance‐Induced, Brief, and Atypical Psychoses to Schizophrenia: A Systematic Review and Meta‐Analysis.” Schizophrenia Bulletin 46, no. 3: 505–516. https://doi.org/10.1093/schbul/sbz102.
Psychiatrists, R. C. o. 2018. Standards for Early Intervention in Psychosis Services. Royal College of Psychiatrists.
Rentero, D., F. Arias, S. Sanchez‐Romero, G. Rubio, and R. Rodriguez‐Jimenez. 2021. “Cannabis‐Induced Psychosis: Clinical Characteristics and Its Differentiation From Schizophrenia With and Without Cannabis Use.” Adicciones 33, no. 2: 95–108. https://doi.org/10.20882/adicciones.1251.
Ricci, V., F. Ceci, F. Di Carlo, et al. 2023. “First Episode Psychosis With and Without the Use of Cannabis and Synthetic Cannabinoids: Psychopathology, Global Functioning and Suicidal Ideation and Antipsychotic Effectiveness.” Psychiatry Research 320: 115053. https://doi.org/10.1016/j.psychres.2023.115053.
Ricci, V., I. Di Muzio, F. Ceci, et al. 2023. “Aberrant Salience in Cannabis‐Induced Psychosis: A Comparative Study.” Frontiers in Psychiatry 14: 1343884. https://doi.org/10.3389/fpsyt.2023.1343884.
Rubio, G., J. Marín‐Lozano, F. Ferre, et al. 2012. “Psychopathologic Differences Between Cannabis‐Induced Psychoses and Recent‐Onset Primary Psychoses With Abuse of Cannabis.” Comprehensive Psychiatry 53, no. 8: 1063–1070. https://doi.org/10.1016/j.comppsych.2012.04.013.
Salazar de Pablo, G., D. Guinart, A. Armendariz, et al. 2024. “Duration of Untreated Psychosis and Outcomes in First‐Episode Psychosis: Systematic Review and Meta‐Analysis of Early Detection and Intervention Strategies.” Schizophrenia Bulletin 50, no. 4: 771–783. https://doi.org/10.1093/schbul/sbae017.
Schimmelmann, B. G., P. Conus, S. Cotton, S. Kupferschmid, P. D. McGorry, and M. Lambert. 2012. “Prevalence and Impact of Cannabis Use Disorders in Adolescents With Early Onset First Episode Psychosis.” European Psychiatry 27, no. 6: 463–469. https://doi.org/10.1016/j.eurpsy.2011.03.001.
Schoeler, T., N. Petros, M. Di Forti, et al. 2016. “Effects of Continuation, Frequency, and Type of Cannabis Use on Relapse in the First 2 Years After Onset of Psychosis: An Observational Study.” Lancet Psychiatry 3, no. 10: 947–953. https://doi.org/10.1016/S2215‐0366(16)30188‐2.
Seddon, J. L., M. Birchwood, A. Copello, et al. 2016. “Cannabis Use Is Associated With Increased Psychotic Symptoms and Poorer Psychosocial Functioning in First‐Episode Psychosis: A Report From the UK National EDEN Study.” Schizophrenia Bulletin 42, no. 3: 619–625. https://doi.org/10.1093/schbul/sbv154.
Siebert, S., K. Leopold, J. Baumgardt, L. S. von Hardenberg, E. Burkhardt, and A. Bechdolf. 2022. “Specialized Inpatient Treatment for Young People With Early Psychosis: Acute‐Treatment and 12‐Month Results.” European Archives of Psychiatry and Clinical Neuroscience 272, no. 7: 1–14. https://doi.org/10.1007/s00406‐022‐01379‐8.
Solmi, M., G. Croatto, G. Piva, et al. 2023. “Efficacy and Acceptability of Psychosocial Interventions in Schizophrenia: Systematic Overview and Quality Appraisal of the Meta‐Analytic Evidence.” Molecular Psychiatry 28, no. 1: 354–368. https://doi.org/10.1038/s41380‐022‐01727‐z.
Stahl, E. A., G. Breen, A. J. Forstner, et al. 2019. “Genome‐Wide Association Study Identifies 30 Loci Associated With Bipolar Disorder.” Nature Genetics 51, no. 5: 793–803. https://doi.org/10.1038/s41588‐019‐0397‐8.
Starzer, M. S. K., M. Nordentoft, and C. Hjorthoj. 2018. “Rates and Predictors of Conversion to Schizophrenia or Bipolar Disorder Following Substance‐Induced Psychosis.” American Journal of Psychiatry 175, no. 4: 343–350. https://doi.org/10.1176/appi.ajp.2017.17020223.
Stone, J. M., H. L. Fisher, B. Major, et al. 2014. “Cannabis Use and First‐Episode Psychosis: Relationship With Manic and Psychotic Symptoms, and With Age at Presentation.” Psychological Medicine 44, no. 3: 499–506. https://doi.org/10.1017/S0033291713000883.
Wade, D., S. Harrigan, J. Edwards, P. M. Burgess, G. Whelan, and P. D. McGorry. 2006. “Substance Misuse in First‐Episode Psychosis: 15‐Month Prospective Follow‐Up Study.” British Journal of Psychiatry 189: 229–234. https://doi.org/10.1192/bjp.bp.105.017236.
Williams, S. R., J. R. t. Agapoff, D. Jalan, E. S. Hishinuma, and L. E. Kida. 2021. “Psychiatric Hospitalization and Length of Stay Differences in Cannabis Users and Non‐Users With a Primary Discharge Diagnosis of Schizophrenia or Schizoaffective Disorder.” Substance Use & Misuse 56, no. 11: 1736–1739. https://doi.org/10.1080/10826084.2021.1949615.
Woolridge, S. M., C. Wood‐Ross, R. Voleti, G. W. Harrison, V. Berisha, and C. R. Bowie. 2023. “A Neuropsychological Approach to Differentiating Cannabis‐Induced and Primary Psychotic Disorders.” Early Intervention in Psychiatry 17, no. 6: 564–572. https://doi.org/10.1111/eip.13348.
Wright, A. C., J. Browne, C. Cather, P. Meyer‐Kalos, and K. T. Mueser. 2023. “Relationship Between Patterns of Cannabis Use and Functional and Symptomatic Trajectories in First‐Episode Psychosis.” European Archives of Psychiatry and Clinical Neuroscience 273, no. 4: 765–778. https://doi.org/10.1007/s00406‐022‐01441‐5.
Yucel, M., E. Bora, D. I. Lubman, et al. 2012. “The Impact of Cannabis Use on Cognitive Functioning in Patients With Schizophrenia: A Meta‐Analysis of Existing Findings and New Data in a First‐Episode Sample.” Schizophrenia Bulletin 38, no. 2: 316–330. https://doi.org/10.1093/schbul/sbq079.
Zanelli, J., A. Reichenberg, K. Morgan, et al. 2010. “Specific and Generalized Neuropsychological Deficits: A Comparison of Patients With Various First‐Episode Psychosis Presentations.” American Journal of Psychiatry 167, no. 1: 78–85. https://doi.org/10.1176/appi.ajp.2009.09010118.
Entry Date(s): Date Created: 20260727 Date Completed: 20260727 Latest Revision: 20260818
Update Code: 20260818
PubMed Central ID: PMC13403289
DOI: 10.1111/eip.70240
PMID: 42504862
Βάση Δεδομένων: MEDLINE