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Psychiatry Res. 2017 May;251:349-354. doi: 10.1016/j.psychres.2017.02.028. Epub 2017 Feb 13.

Differences in the symptom profile of methamphetamine-related psychosis and primary psychotic disorders.

Author information

1
National Drug Research Institute, Faculty of Health Sciences, Curtin University, Perth, Australia; Centre for Research on Ageing, Health and Well-being, the Australian National University, Canberra, Australia; National Drug and Alcohol Research Centre, University of New South Wales, Sydney, Australia. Electronic address: rebecca.mcketin@curtin.edu.au.
2
School of Medicine and Public Health, University of Newcastle, Callaghan, Australia.
3
School of Applied Psychology, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia.
4
Centre for Research on Ageing, Health and Well-being, the Australian National University, Canberra, Australia.
5
Turning Point, Eastern Health and Monash University, Melbourne, Australia.

Abstract

We examined the lifetime experience of hallucinations and delusions associated with transient methamphetamine-related psychosis (MAP), persistent MAP and primary psychosis among a cohort of dependent methamphetamine users. Participants were classified as having (a) no current psychotic symptoms, (n=110); (b) psychotic symptoms only when using methamphetamine (transient MAP, n=85); (c) psychotic symptoms both when using methamphetamine and when abstaining from methamphetamine (persistent MAP, n=37), or (d) meeting DSM-IV criteria for lifetime schizophrenia or mania (primary psychosis, n=52). Current psychotic symptoms were classified as a score of 4 or more on any of the Brief Psychiatric Rating Scale items of suspiciousness, hallucinations or unusual thought content in the past month. Lifetime psychotic diagnoses and symptoms were assessed using the Composite International Diagnostic Interview. Transient MAP was associated with persecutory delusions and tactile hallucinations (compared to the no symptom group). Persistent MAP was additionally associated with delusions of reference, thought interference and complex auditory, visual, olfactory and tactile hallucinations, while primary psychosis was also associated with delusions of thought projection, erotomania and passivity. The presence of non-persecutory delusions and hallucinations across various modalities is a marker for persistent MAP or primary psychosis in people who use methamphetamine.

KEYWORDS:

Amphetamine; Amphetamine-related disorders; Central nervous system stimulants; Hallucinations; Paranoia; Psychotic disorders; Street drugs

PMID:
28282630
DOI:
10.1016/j.psychres.2017.02.028
[Indexed for MEDLINE]

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