Alcohol Use Disorder

Article Author:
Sara Nehring
Article Editor:
Andrew Freeman
Updated:
9/10/2018 11:40:02 AM
PubMed Link:
Alcohol Use Disorder

Introduction

Alcohol misuse has been linked to numerous social, economic, and health problems. Estimates vary but have suggested that up to 40% of patients have experienced complications of alcohol misuse.  In the United States, 138.3 million people age 12 and older, surveyed, report that they actively use alcohol, according to the 2015 National Survey on Drug Use and Health.  Of those, 48.2% report that they had binge drinking episode(s) within 30 days before taking the survey.  Of those who reported binge drinking, 26% reported heavy alcohol use, defined as binge drinking five or more days in the previous 30 days, which accounts for 12.5% of total alcohol users. This means that 5.9%, or 15.7 million people in the United States aged 12 and older, meet criteria for an alcohol use disorder (see image for criteria). More than 85,000 deaths per year can be attributed to alcohol.

Etiology

Although the pathogenesis of alcohol use disorder is not strictly known, several factors are thought to contribute to its development. These include environmental influences, such as home environments, peer interactions, genetic factors, the level of cognitive functioning, and certain existing personality disorders. Some of the genes suspected include GABRG2 and GABRA2, COMT Val 158Met, DRD2 Taq1A, and KIAA0040.  Personality disorders associated with the development of an alcohol use disorder include disinhibition and impulsivity-type disorders, as well as depressive and socialization-related disorders.

Epidemiology

According to the 2015 National Survey on Drug Use and Health conducted by the Substance Abuse and Mental Health Administration, an estimated 20.8 million Americans age 12 and older had a substance use disorder, of which 15.7 million were alcohol use disorders.  Of those, 2.7 million had an illicit drug use disorder as well.  This number makes alcohol the leading substance abused in the United States.  Of the people with alcohol use disorder and illicit drug disorder, 623,000 of these were adolescents ages 12 to 17 (2.5% of all adolescents). Almost four million (3.8 million) individuals ages 18-25 (10.9% of young adults) and 11.3 million individuals 26 years or older (5.4%) had both an alcohol use disorder and illicit drug disorder. However, this number has been steadily declining since 2002. Almost half of people with any substance abuse problem, including alcohol, also had a co-existing mental illness.

Pathophysiology

Multiple theories have been suggested as to why some people develop alcohol use disorders. Some of the more evidence-supported theories include positive-effect regulation, negative-effect regulation, pharmacological vulnerability, and deviance proneness. Positive-effect regulation results in drinking for positive rewards (such as feelings of euphoria). Negative-effect regulation is seen when one drinks to cope with feelings of a negative nature, such as depression, anxiety, or feelings of worthlessness. Pharmacological vulnerability makes a note of an individual's varied response to both acute and chronic effects of alcohol intake and the individual differences in the body's ability to metabolize the alcohol. Deviance proneness speaks more to an individual's tendency towards deviant behavior established during their childhood, often due to a deficiency in socialization at an early age.

Toxicokinetics

The metabolism of alcohol is affected by many factors. Females tend to eliminate alcohol faster than men, although their first-pass metabolism is slower due to lower antidiuretic hormone (ADH) levels, resulting in higher blood alcohol concentration initially. Fetal livers also eliminate alcohol more slowly due to CYP2E1 and ADH not being fully expressed.  Native Americans eliminate alcohol more quickly as well, due to the expression of beta-3 Class 1 ADH isoforms as opposed to subjects only expressing the beta-1 isoform. Alcohol metabolism is also lower in a fasting state, as when one is fed.  This is due to the lower ADH levels seen in the fasting state. There is also an impact on alcohol elimination seen with a time of day; the highest elimination is seen at the end of the daily dark period. Heavy drinking also increases the rate of elimination, although this does eventually slow, once the advanced liver disease is present. Medications that act as ADH inhibitors will slow the alcohol elimination rate. H2 receptor blockers will also inhibit ADH, thereby reducing the first-pass metabolism in the stomach and increasing blood alcohol levels.

History and Physical

History gathering will often reveal reported episodes of binge drinking of four or five or more drinks at a time. Use of CAGE questionnaire will reveal a score of 2 or greater (CAGE means (1) have you ever felt you should Cut down on your drinking, (2) have you ever been Annoyed by people criticizing your drinking, (3) have you ever felt Guilty about your alcohol use, or (4) have you ever needed an Eye-opener to steady your nerves or get rid of a hangover). The patient may also report frequent falls, blackout spells, unsteadiness, or visual disturbances. They may report seizures if they went a few days without drinking, or tremors, confusion, emotional disturbances, and frequent job changes. They may also report social issues, such as job termination, separation/divorce, estrangement from family, of loss of their home. They may also report sleep disturbances.

The patient may have hypertension (HTN) or insomnia initially. In later stages, the patient may complain of nausea/vomiting, hematemesis, abdominal distension, epigastric pain, weight loss, jaundice, or other symptoms or signs suggestive of liver dysfunction. They may be asymptomatic early on.

On exam, they may exhibit signs of cerebellar dysfunction, such as ataxia or difficulty with fine motor skills. They may exhibit slurred speech, tachycardia, memory impairment, nystagmus, disinhibited behavior, or hypotension. They may present with tremors, confusion/mental status changes, asterixis, ruddy palms, jaundice, ascites, or other signs of advanced liver disease. There may also be spider angiomata, hepatomegaly/splenomegaly (early; liver becomes cirrhotic and shrunken in advanced disease). They may develop bleeding disorders, anemia, gastritis/ulcers, or pancreatitis as complications of the alcohol use. Labs will reveal anemia, thrombocytopenia, coagulopathy, hyponatremia, hyperammonemia, elevated ammonia levels, or decreased B12/folate levels as the advanced liver disease develops.

Evaluation

Evaluation should include questions about alcohol use, specifically how often and how much. A CAGE questionnaire as described above should be used, as well as the screening questions for alcohol use disorder that are displayed in the image below. The practitioner should elicit a family history regarding alcohol and other substance use disorders, as well as a family and personal history of any psychiatric disorders. The patient should be screened for any medical or behavioral complications of alcohol abuse, such as macrocytic anemia, elevated liver enzymes, coagulopathies, pancreatitis, frequent falls, job loss, relationship issues, or aberrant behaviors such as risky sexual behavior or impulsiveness.

Treatment / Management

Some treatment foci that have demonstrated promise include evidence-based motivational interviewing. This particular approach helps the patients explore the reasons behind their ambivalence with respect to changing their behavior or alcohol cessation to change their substance abuse-related behaviors with a personalized assessment of risks and needs. Other therapies include cognitive behavior therapy, 24-hour residential facilities that aim to treat medical as well as psychiatric complications or comorbidities associated with the alcohol use and process of cessation. There are also multiple programs, such as Alcoholics Anonymous or other 12-step programs that focus on group support/mentors that can provide a source of assistance with the maintenance of abstinence. Many patients have lapses during their lifetime and will require initiation of differing intensities of therapy throughout their lifetime.

Pearls and Other Issues

Complications of alcohol use disorders can be far-reaching and can impact a patient's socioeconomic status, mental health, interpersonal relationships, employment, and physical well-being. Early intervention and repeated non-malignant discussions between the patient and provider are important. The patient's successes should be noted and resources for continued efforts offered at each visit. Discussion regarding barriers to the patient seeking cessation or assistance should occur to find new ways to approach the alcohol use disorder (AUD) in the hope of improving successful cessation of the behaviors.



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      Contributed by Sara M Nehring