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Year : 2016  |  Volume : 2  |  Issue : 4  |  Page : 213-218

Effects of cannabis use on cognitive function and clinical features of bipolar disorder

1 Department of Psychiatry, Institute of Post Graduate Medical Education and Research, Kolkata, West Bengal, India
2 Department of General Medicine, ESI Hospital, Belur, Howrah, West Bengal, India

Correspondence Address:
Dr. Ajay Halder
Puspak Apartment, GR-FR, FL-A, 14/17A, East Mall Road, Kolkata - 700 080, West Bengal
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2395-2296.189677

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Aims: This study aims to compare the cognitive function of patients having dual diagnosis of bipolar affective disorder and cannabis dependence with those having either diagnosis alone and with healthy controls. Settings and Design: Hospital-based study. Subjects and Methods: Study subjects were selected from patients attending psychiatry outpatient department in the presence of two senior consultant psychiatrists. Among the pool of the patients, only those who meet the inclusion and exclusion criteria were selected for the study. Then the selected patients were administered the semi-structured sociodemographic data sheet, Young Mania Rating Scale, Hamilton Depression Rating Scale, General Health Questionnaire-12, Trail Making Test Part A and Part B, verbal fluency tests, Stroop Neuropsychological Screening Test, clock drawing test. Statistical analysis was done by using appropriate statistical methods. Statistical analysis was done with the help of Statistical Package for Social Science-20 (SPSS-20, International Business Machines Corporation (IBM)). Results: The results of our study showed there was significant impairment of cognitive function of the patients of bipolar with cannabis dependence than the patients of bipolar disorder or cannabis dependence alone. It had been also found that with an increase in age of onset of bipolar disorder, there was decrease in no of episode, decrease current duration, and inter-episodic recovery was better. Conclusions: The significant cognitive function impairment exists in bipolar with cannabis dependence and the severity of bipolar outcome correlate with the extent of cannabis use also. In spite of certain limitations such as small sample size, short follow-up time, absence of Indian version of neuropsychological tests, and referral bias inherent in hospital-based studies; present study provides valuable empirical insight into complex relationship between cannabis dependence, bipolar disorder, and cognitive dysfunction.

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