Alcohol, Drugs, Genes and the Clinical Laboratory

An Overview for Healthcare and Safety Professionals

Amitava Dasgupta

• Publisher: Academic Press
• Year: 2016
• ISBN:
  9780128093344
• Topic: Medicine
• Subtopic: Toxicology

Alcohol, Drugs, Genes and the Clinical Laboratory provides an overview and quick reference to genetic relationships and clinical laboratory information related to the serious public health issue of alcohol and drug abuse. Written in a clear and concise manner, this book discusses the necessary information for health and safety professionals working in public health to learn about complex issues quickly to better help their patients, employees, and others affected by alcohol and drug abuse. Alcohol, Drugs, Genes and the Clinical Laboratory covers the important aspects of drugs and alcohol abuse including genetic aspects along with laboratory methods for analysis of alcohol and abused drugs with emphasis on false positive test results. The book is helpful to healthcare professionals, such as pathologists who oversee alcohol and drug testing, emergency room physicians, family practice physicians who are first healthcare professionals who identify patients susceptible to drug and alcohol abuse, and psychiatrists involved with drug and alcohol rehabilitation programs. It will also be useful to safety professionals who have to assess individuals for workplace responsibilities, ranging from police and recruitment to occupational safety and occupational medicine and public health officials.

• Features accessible language for healthcare and safety professionals who are not experts in laboratory procedures
• Provides examples from clinical and everyday situations
• Explains how to interpret laboratory results and the latest genetic factors regarding drug and alcohol abuse

1

Alcohol a double-edged sword

Health benefits with moderate consumption but a health hazard with excess alcohol intake

Abstract

United States Department of Agriculture guidelines suggest up to 2 drinks a day for men and for women up to 1 drink per day. Moderate alcohol consumption has many health benefits including lowering the risk of heart disease and stroke. Recent research indicates that drinking red wine may lower not only the risk of myocardial infarction and stroke but also Alzheimer’s disease due to beneficial effect of resveratrol present in red wine. However, all these benefits disappear with excess alcohol consumption (over 60 g/day; 4–5 drinks per day) and alcoholic liver cirrhosis may be even fatal. This chapter will address both the health benefits and the health hazards of alcohol.

Keywords

Alcohol; moderate drinking guidelines; health benefits; alcohol abuse

Introduction

Alcohol has health benefits if consumed in moderation but alcohol acts as a toxin in heavy drinkers. Alcohol content of various alcoholic beverages varies widely, e.g., beer contains approximately 4–7% alcohol while the average alcohol content of vodka is 40–50%. However, due to wide differences between serving size, 1 drink (often called 1 standard drink) contains approximately 0.6 ounces of alcohol which is equivalent to 14 g of pure alcohol. In the United States, a standard drink is defined as a bottle of beer (12 fluid ounces) containing 5% alcohol, 8.5 fluid ounces of malt liquor containing 7% alcohol, a 5 fluid ounce glass of wine containing 12% alcohol, 3.5 fluid ounces of fortified wine like sherry or port containing about 17% alcohol, 2.5 fluid ounces of cordial or liqueur containing 24% alcohol, or 1 shot (1.5 fluid ounces) of a distilled spirits such as gin, rum, vodka, or whiskey.

Currently, in the United States, the alcohol content of a drink is measured by the percentage of alcohol by the volume. The code of Federal Regulations requires that the label of alcoholic beverages must state the alcohol content by volume. Alcoholic drinks primarily consist of water, alcohol, and variable amounts of sugars and carbohydrates (residual sugar and starch left after fermentation) but negligible amounts of other nutrients such as proteins, vitamins, or minerals. However, distilled liquors such as cognac, vodka, whiskey, and rum contain no sugars. Red wine and dry white wines contain 2–10 g of sugar per liter while sweet wines and port wines may contain up to 120 g of sugar per liter of wine. Beer and dry sherry contain 30 g of sugar per liter [1].

Guidelines for alcohol consumption

United States Department of Agriculture (USDA) and Department of Health and Human Services jointly publish “Dietary Guidelines for Americans” every 5 years, suggesting to Americans what constitutes a balanced diet. These guidelines also include suggestions for drinking in moderation. However, alcohol is not a component in the USDA food pattern. If alcohol is consumed, the calories from alcohol must be accounted for when other foods are consumed so that daily calorie intake does not exceed the recommended limit (1600–2400 calories per day for women and 2000–3000 calories per day for men). The latest Dietary Guidelines for Americans, 2015–2020, eighth edition, suggests that if alcohol is consumed it should be consumed in moderation following these guidelines:

• Up to 1 drink per day for women and up to 2 drinks per day for men—and only by adults of legal drinking age (21 years or older).

One drink is defined by the guidelines as containing 14 g (0.6 fluid ounces) of pure alcohol. One alcoholic drink is equivalent to 12 fluid ounces of regular beer (5% alcohol), 5 fluid ounces of wine (12% alcohol), or 1.5 fluid ounces of 80 proof distilled spirits (40% alcohol). If light beer is consumed (4.2% alcohol) it should be considered as 0.8 drink. Mixed drinks (including fruit drinks mixed with spirits) with more than 1.5 fluid ounces of alcohol should be considered as more than 1 drink. The formula for calculating drink equivalent is:

$\mathrm{Drink\; equivalent}=\mathrm{Volume\; of\; alcoholic\; beverage}\times \mathrm{Alcohol\; content}/0.6$

For example, drinking 16 fluid ounces of beer containing 5% alcohol is equivalent to 1.33 drinks.

Federal Food and Drug Administration has determined that mixing alcohol and caffeine is not a safe practice and recommended four manufacturers of alcoholic beverages containing caffeine to discontinue using caffeine in alcoholic drinks. People who mix alcohol and caffeine may drink more alcohol and become more intoxicated than they realize, increasing the risk of alcohol-related adverse events. Energy drinks are gaining popularity among young adults as well as among underage drinkers. Studies have indicated that energy drinks may increase craving for alcohol and binge drinking. When an energy drink, which often contains caffeine, is combined with alcohol, the desire to drink alcohol is more pronounced compared to drinking alcohol without consumption of an energy drink. Moreover, pleasurable experience of drinking alcohol is also enhanced by consuming energy drinks at the same time [2].

National Institute of Alcohol Abuse and Alcoholism (NIAAA) considers high risk drinking as consuming 4 or more drinks in any day or 8 or more drinks per week for women and 5 or more drinks in any day or 15 or more drinks per week for men. Binge drinking is defined by NIAAA as the consumption of 5 drinks in 2 h for men and 4 drinks in the same time period for women and such drinking patterns always produce a blood alcohol level of 0.08% or higher. However, another government agency Substance Abuse and Mental Health Services Administration (SAMHSA) defines binge drinking as consuming 5 or more alcoholic beverages on the same occasion in the past 30 days. SAMHSA also defines heavy drinking as consuming 5 or more drinks on the same occasion on each of 5 or more days in the past 30 days. However, National Institute for NIAAA investigators have shown that if women consume 3 drinks on a single day, not exceeding 7 drinks per week, and men consume 4 drinks on a single occasion but not exceeding 14 drinks per week, the possibility of developing alcohol use disorder (AUD) is approximately 2%, a relatively low risk for developing AUD. Definitions of moderate drinking, binge drinking, heavy drinking, and underage drinking are listed in Table 1.1.

Table 1.1

Definition of moderate, high risk, heavy, and binge drinking

Type of drinking	Definition/guideline
Moderate drinking (Dietary Guidelines for Americans 2015–2020, eighth edition)	Up to 1 drink per day for women and up to 2 drinks per day for men.
High risk drinking (NIAAA)	Consumption of 4 or more drinks on any day or 8 or more drinks per week for women and 5 or more drinks on any day or 15 or more drinks per week for men.
Heavy drinking (SAMHSA) guideline	Consuming 5 or more drinks in the same occasion on each of 5 or more days in the past 30 days in both females and males.
Binge drinking (NIAAA)	Consuming 5 drinks in a 2 h period for men and four drinks in a 2 h for women. Such drinking practice produces a blood alcohol level of 0.08% or more.
Binge drinking (SAMHSA)	Consuming 5 or more drinks in the same occasion at least 1 day in the past 30 days for both men and women.
Underage drinking	Legal age of drinking in all States in United States is 21 years. Anyone drinking below that age is considered to be underage drinking.

NIAAA, National Institute on Alcohol Abuse and Alcoholism; SAMHSA, Substance abuse and Mental Health Services Administration.

Alcohol use and abuse

According to the 2014 National Survey on Drug Use and Health (published in September 2015) conducted by SAMHSA (an agency of the US government), 139.7 million Americans had consumed alcohol during the past 30 days when contacted for the survey, including 16.3 million Americans who were heavy alcohol users (drinking 5 or more drinks in one occasion on 5 or more days in the past 30 days). It was also estimated that 60.9 million Americans were binge drinkers. The World Health Organization (WHO) estimated that 5.1% global burden of disease and injuries are related to alcohol abuse [3]. Drinking more than the recommended amount can cause serious problems because the health benefits of drinking in moderation disappear fast with consuming more than 3–4 drinks a day. Heavy consumption of alcohol not only leads to increased domestic violence, decreased productivity, increased risk of motor vehicle as well as job related accidents, but also to increased mortality from liver cirrhosis, stoke, and cancer. Alcohol poisoning may also cause fatality.

Alcohol is involved in many fatal car accidents and according to US Highway National Traffic and approximately 30% of traffic fatalities are linked to excessive alcohol consumption. Excessive alcohol consumption is responsible for 10–18% of injured patients who are admitted to emergency departments in United States. Moreover, economic cost of excessive alcohol consumption is estimated to be $223.5 billion annually in the United States [4].

Physiological effects of various blood alcohol levels

Blood alcohol depends on many factors including number of drinks, gender (females show higher blood alcohol than males for consuming same amounts of alcohol when body weights are comparable), and body weight. Moreover, peak blood alcohol level is lower if alcohol is consumed with food and if alcohol is sipped instead of consumed rapidly. The presence of food not only reduces blood alcohol level but also stimulates its elimination through the liver. Alcohol is first metabolized to acetaldehyde by the enzyme alcohol dehydrogenase and then by aldehyde dehydrogenase into acetate. Acetate finally breaks down into carbon dioxide and water. For higher alcohol consumption, liver CYP2E1 plays a role in alcohol metabolism.

Substantial research has established that the effect of alcohol on the human depends on the blood alcohol concentration. At a very low blood alcohol level people usually feel relaxation and mild euphoria and some loss of inhibition or shyness. However, at blood alcohol levels that exceed the legal limit for driving in United States, significant impairment of motor skills may occur. At a blood alcohol level of 0.3% and higher, complete loss of consciousness may occur and a blood alcohol level of 0.5% and higher may even cause death (Table 1.2). Drinking excessive alcohol in one occasion may cause alcohol poisoning which if not treated promptly may be fatal. Celik et al. reported that postmortem blood alcohol levels ranged from 136 to 608 mg/dL in 39 individuals who died due to alcohol overdose. Most of those deceased were male [5]. The mechanism of death from alcohol poisoning is usually attributed to paralysis of respiratory and circulatory centers in the brain causing asphyxiation.

Table 1.2

Physiological effects of various blood alcohol l...

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright
• Preface
• 1. Alcohol a double-edged sword: Health benefits with moderate consumption but a health hazard with excess alcohol intake
• 2. Drugs of abuse: An overview
• 3. Designer drugs including bath salts and spices
• 4. Combined alcohol and drug abuse: A potentially deadly mix
• 5. Link between environmental factors, personality factors, and addiction
• 6. Genetic polymorphisms of alcohol metabolizing enzymes associated with protection from or increased risk of alcohol abuse
• 7. Pharmacogenomics of abused drugs
• 8. Association between polymorphisms in genes encoding various receptors, transporters, and enzymes and alcohol/drug addiction
• 9. Methods of alcohol measurement
• 10. Laboratory methods for measuring drugs of abuse in urine
• 11. Analysis of drugs of abuse in serum, hair, oral fluid, sweat, and meconium
• Index