Substance+Use+Disorders+Palmer_revised2022

Introduction

  • Substance Use Disorders (SUDs) are a major public health problem.

    • Cost to the United States exceeds $700 billion annually.

    • Responsible for at least 40% of all hospital admissions annually and approximately 25% of deaths (around 500,000 per year).

    • Lifetime prevalence of psychiatric diagnoses in individuals with SUD is as high as 90%.

Overview of Substance Use Disorder

  • Prevalence: Over 40 million Americans have substance use disorders requiring treatment.

    • Number is comparable to individuals with diabetes.

    • Only heart disease affects more individuals than SUDs.

  • Treatment Rate: Only 11% of affected individuals receive treatment.

    • 80 million additional individuals are identified as at-risk users.

Neurobiological Theories of SUDs

  • First Use to Dependence:

    • Initial drug use may be voluntary and linked to impulsivity.

    • Some cases relate to medical management (e.g., opioids).

    • Gradual loss of control leads to drug-seeking and compulsivity.

Mechanism of Dependence

  • Dopamine Release: Initial drug use triggers significant dopamine release, inducing a sense of pleasure.

  • Neuroadaptation: Repeated use causes the brain to adapt:

    • Receptor downregulation due to increased dopaminergic activity.

    • Users report diminished effects of substances, needing more to achieve the same high (the new normal).

Pathways and Components of SUD

  • Key Components in SUD Pathways:

    • Reward (VTA to ventral striatum)

    • Motivation (increased impulsivity over time)

    • Learning/Conditioning (amygdala influences anticipation of drug effects)

    • Inhibition Control (decreased prefrontal inhibitory control leads to impulsivity).

DSM-5 Criteria for Substance Use Disorders

  • A pattern of substance use leading to clinical impairment or distress, as indicated by at least two of the following within 12 months:

    • Increased Use: Taken in larger amounts than intended.

    • Persistent Desire: Unsuccessful efforts to cut down.

    • Time Spent: Significant time spent obtaining, using, or recovering from effects.

    • Cravings: Strong desire or urge to use.

    • Role Obligations: Failure to fulfill obligations at work, school, or home.

    • Social Problems: Continued use despite negative effects on social and interpersonal relationships.

    • Hazardous Situations: Use in physically hazardous situations.

    • Knowledge of Problems: Continued use despite awareness of physical or psychological problems caused or worsened by use.

    • Tolerance: Need for increased amounts or diminished effect with continued use.

    • Withdrawal: Characteristic withdrawal symptoms or using specific substances to relieve or avoid withdrawal symptoms.

  • Specifiers for Severity:

    • Mild: 2-3 symptoms

    • Moderate: 4-5 symptoms

    • Severe: 6 or more symptoms.

Alcohol Specifics

Neurobiology

  • Alters GABA and glutamate neurotransmitter systems; enhances inhibitory signals and reduces excitatory signals.

  • Moderate alcohol consumption affects the mesolimbic reward circuitry involving opioids.

Intoxication Signs/Symptoms

  • Impairments include slurred speech, unsteady gait, nystagmus, and amnesia (blackouts).

Withdrawal Management

  • Common interventions include benzodiazepines and supportive therapy.

  • Alcohol hallucinosis may occur, characterized by hallucinations and clearly aware of their surroundings.

Comorbidities

  • Wernicke's Encephalopathy and Korsakoff's Syndrome both stem from thiamine deficiency due to chronic alcohol abuse.

Opioid Use Disorder (OUD)

Neurobiology

  • Exogenous opioids act primarily at mu-opioid receptors, leading to feelings of euphoria and tranquil effects.

  • Tolerance builds, increasing the need for higher doses.

Intoxication Symptoms

  • Symptoms include euphoria, drowsiness, pupillary constriction, and respiratory depression.

    • Naloxone (Narcan) is used for overdose reversal.

Withdrawal Symptoms

  • Symptoms include anxiety, cravings, muscle pain, and symptoms generally last 7-10 days after last use.

Treatment Approaches for SUDs

Pharmacological Treatments

  • Key medications include Disulfiram, Naltrexone, Acamprosate, and Buprenorphine for alcohol and opioid use disorders, and Topiramate for stimulants.

Behavioral Interventions

  • Incorporate therapies such as Cognitive Behavioral Therapy, Motivational Interviewing, and 12-step methods like AA/NA.

Pregnancy and SUDs

  • Emphasize abstinence during pregnancy; consequences of SUDs can manifest in Fetal Alcohol Spectrum Disorders (FASDs).

Conclusion

  • Understanding the neurobiology, assessment, and multifaceted treatment approaches is crucial for managing substance use disorders.

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