Cannabis use among hospitalized young people experiencing a first episode of psychosis: a case control study

Paz Castaneda, Carmen; Maria Alliende, Luz; Iruretagoyena, Barbara; Nachar, Ruben; Mancilla, Felipe; Diaz, Camila; Gallardo, Carlos; Mena, Cristian; Pablo Ramirez-Mahaluf, Juan; Undurraga, Juan; Gonzalez-Valderrama, Alfonso; Crossley, Nicolas A.


Background: Cannabis use among young people in Chile has increased significantly in the last years. There is a consistent link between cannabis and psychosis. Aim: To compare cannabis use in patients with a first episode of psychosis and healthy controls. Material and Methods: We included 74 patients aged 20 +/- 3 years (78% males) admitted to hospital with a first episode of psychosis and a group of 60 healthy controls aged 23 +/- 4 years (63% males). Cannabis consumption was assessed, including age of first time use and length of regular use. Results: Patients with psychosis reported a non-significantly higher frequency of life-time cannabis use. Patients had longer periods of regular cannabis use compared with healthy subjects (Odds ratio [OR] 2.4; 95% confidence intervals [CI] 1.14-5.05). Patients also used cannabis for the first time at an earlier age (16 compared with 17 years, p 0.0). The population attributable fraction for regular cannabis use associated with hospital admissions due to psychosis was 17.7% (95% CI 1.2-45.5%). Conclusions: Cannabis use is related to psychosis in this Chilean group of patients. This relationship is stronger in patients with early exposure to the drug and longer the regular use. One of every five admissions due to psychosis is associated with cannabis consumption. These data should influence cannabis legislation and the public policies currently being discussed in Chile.

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Título según WOS: ID WOS:000637311000008 Not found in local WOS DB
Título de la Revista: REVISTA MEDICA DE CHILE
Volumen: 148
Número: 11
Editorial: Sociedad Médica de Santiago
Fecha de publicación: 2020
Página de inicio: 1606
Página final: 1613
Notas: ISI