Oct 9 D&B

Numerous factors influence the susceptibility to alcohol use disorder (AUD).
Genetics play a critical role in the development of AUD, particularly for individuals with a family history of the disorder.

Animal Models and Selective Breeding
- Studies using rats have illustrated a genetic predisposition to alcohol consumption through selective breeding experiments.
- Top 25% of alcohol-consuming rats were bred together to create a line that consumes high alcohol amounts (AA rats).
- Similarly, the bottom 25% were bred to create a line that avoids alcohol (ANA rats).
Effects of Alcohol
- Selective breeding also examines how alcohol affects animals, focusing on the duration they remain inverted when given alcohol (sleeping reflex studies).
- Line bred for long sleep (highly affected by alcohol) and short sleep (less affected) demonstrates genetic influence.
Withdrawal Severity
- Some strains of rats were bred based on withdrawal severity, showing significant variability in responses, indicating genetic influence.

Family Studies
- Individuals born to parents with AUD have a significantly increased probability of developing the disorder.
- Historical references, like those from Plutarch, reinforce the idea of familial predisposition to drunkenness.
- Risk for developing AUD is about 50% for males and 10% for females born to affected parents.
Twin Studies
- Concordance rates in monozygotic (identical) twins are typically higher than in dizygotic (fraternal) twins for various traits, including AUD.
- Estimation of heritability for AUD is typically around 50-60%, similar to IQ.
Adoption Studies
- Offspring of alcoholic parents, even when adopted, continue to show elevated risk for AUD, suggesting genetic factors outweigh environmental ones in some cases.

Type 1 (Non-familial)
- Affects both genders equally, typically begins after age 25, associated with binge drinking, and linked to psychiatric conditions like depression and anxiety.
Type 2 (Familial)
- Largely inherited, more prevalent in males, has an earlier onset (before age 25), characterized by daily high consumption and linked to antisocial personality disorder.

Approximately 15% of Americans aged 12 and older have AUD, but only about 10% receive treatment.
Barriers to Treatment
- Denial of problems, fear of losing their social life, belief treatment is ineffective, and stigma, particularly among females, contribute to low treatment rates.

Roughly 40% of individuals with AUD experience comorbid psychiatric conditions:
- Major Depression - 6 times more likely among those with AUD, significantly correlating with higher suicide rates.
- Anxiety Disorders - 5 times more likely among those with AUD.
- Antisocial Personality Disorder - Often co-occurs, posing complexities in treatment due to its challenging nature.

Disulfiram (Antabuse)
- Blocks the metabolism of acetaldehyde to cause adverse reactions to alcohol consumption.
- Less frequently used nowadays, often only for motivated individuals due to potential for noncompliance.
Naltrexone
- An opiate antagonist that diminishes the reinforcing effects of alcohol.
- Reduces relapse rates when combined with psychological treatments based on evidence from clinical studies.
Acamprosate
- Helps manage withdrawal symptoms and cravings by acting on the glutamate system, making it easier to resist alcohol after detoxification.

Evidence shows a significant genetic basis for alcohol use disorder, boasting various influences ranging from family history to environmental factors.
Treatment strategies incorporate pharmacological approaches to address both psychological and physiological aspects of alcoholism, providing a multifaceted approach to recovery.