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Epidemiology of addictive disorders: a brief review MRCPsych addiction psychiatry seminar series

Epidemiology of addictive disorders: a brief review MRCPsych addiction psychiatry seminar series. Dr Stuart McLaren 2 nd March 2012. Epidemiology of substance use. consumption /use. dependence. problems/harms. Prevalence of psychiatric disorders, % adult population.

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Epidemiology of addictive disorders: a brief review MRCPsych addiction psychiatry seminar series

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  1. Epidemiology of addictive disorders: a brief reviewMRCPsych addiction psychiatry seminar series Dr Stuart McLaren 2nd March 2012

  2. Epidemiology of substance use consumption /use dependence problems/harms

  3. Prevalence of psychiatric disorders, % adult population Common mental disorders 16.2 Psychosis 0.4 Alcohol dependence 5.9 Drug 9.2 APMS 2007

  4. Lifetime prevalence of drug use, % of adult population Overall 35.5 Cannabis 30 Amphetamines 12 Cocaine 7.7 Ecstasy 7.3 Opiates <1 2006/2007 BCS

  5. Prevalence rate of heroin and crack cocaine users in England per 1000 population aged 15 to 64 by gender Rate 95% CI Male 15.32 14.86-15.87 Female 4.64 4.61-4.99 Hay et al. 2007

  6. Prevalence of drug dependence, % adult population All 3.4 Cannabis only 2.5 Other drugs 0.9 2007 APMS

  7. Prevalence of injecting in England per 1000 population aged 15 to 64 Rate 95% CI 3.01 2.92-3.14 2009/10 NDEC

  8. Main drug in adult treatment populations (n=174250) Heroin 66% Crack 6% Cocaine 6% Methadone 8% Cannabis 7% NDTMS 2007/8

  9. Illicit drug trends • Drug dependence stable since 2000 • Increasing multiple drug use • Opiate use stable, may be falling in young • Use of opiates correlates with deprivation • Cannabis use may be falling • Use greater in lower income groups

  10. Psychiatric co-morbidity 70% of opiate users have another current psychiatric disorder Drug dependency strongly associated with: • ASPD • BPD 2007 APMS

  11. Substance related harms and risks ‘with drugs nothing is always. Their use does not carry a guarantee of danger, but neither is their safety guaranteed. What one needs to ask about any substance is not whether in absolute terms it is safe, but rather the degree of risk which may attach to its use.’

  12. Health consequences of drug use • Acute toxic effects, including overdose • Acute intoxication effects, including accidental injury and violence • Dependence • Adverse health effects of chronic, regular use, including chronic disease, BBVs and mental disorder

  13. Risky periods for opiate users Risk increases during periods of transition: • Release form prison (SMR ~8) • Early in substitute treatment (x3 increase compared with later treatment) • Following discharge from methadone maintenance treatment (MRR ~10 in first 2 weeks)

  14. Epidemiology of drinking and alcohol-related harm consumption /use dependence problems/harms

  15. Consumption and risk – units/week Men Women Low risk <21 <14 Hazardous 22-50 15-35 drinking Harmful drinking >50 >35

  16. Prevalence of hazardous and harmful drinking, % adult population hazardous harmful AUDIT score 8 or more 16 or more M 38 6 F 15 2 All 25 3.8 APMS 2007

  17. Prevalence of alcohol dependence in last 6/12 - % of adult population M F All Mild 7.8 3.2 5.4 Moderate 0.8 0 0.4 Severe 0.1 0 0.1 Overall 8.7 3.3 5.9 2007 APMS

  18. Psychiatric co-morbidity 37% of those with alcohol use disorders have another mental disorder Alcohol dependence is • strongly associated with ASPD • moderately associated with BPD and drug dependence 2007 APMS

  19. Alcohol trends • CAGE scores increasing between generations of men • Dependence and hazardous drinking peak in middle occupations • Heavy drinking shows no clear class gradient • Younger people and women at particular risk

  20. 1. Risk factors for drug use • Social factors • Availability • Early use of tobacco and alcohol • Disadvantaged background • Family factors • Poor parent-child relationships • Parental conflict • Parental dug use

  21. 2. Risk factors for drug use Individual factors: • male • novelty seeking personality • early conduct disorder • poor school performance/early school leaving Affiliation with antisocial and drug-using peers Above factors often co-occur

  22. Risk factors for drug dependency • Early onset of drug use • Multiple drug use • Mental health disorders before the age of 15 years (conduct disorder and depression)

  23. Addiction careers‘the period in which substance use causes problems’

  24. Clinical course of alcohol dependence Age of: • First drink* 13-15 years • First intoxication* 15-17 years • First problem* 16-22 years • Onset of dependence 25-40 years • Age of death 60 years * Same as general population

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