Alcohol and Alcohol Use Disorder _ _____________________________________________________________
two diseases: anxiety and alcohol use disorder. Social anxiety can be a major impediment to active participation and even attendance to group therapy and 12-step meetings. PAIN Pain is a subjective experience, and the perception of being in pain is an important factor of the alcohol use disorder. It is hypothesized, as well as established in some research, that individuals in pain will drink as a means to decrease their perception of pain or as a reaction to painful stimuli [240]. According to the National Institute on Alcohol Abuse and Alcoholism, an estimated one in four adults in chronic pain reports self-medicating with alcohol and 43% to 73% of people with alcohol use disorder report experiencing chronic pain [241]. ABUSE/DEPENDENCE ON OTHER DRUGS All drugs of abuse, including alcohol, cause dopamine release in the mesolimbic system in the brain. This dopamine system, sometimes referred to as the neuroanatomy of pleasure or reinforcement, starts in the ventral tegmental area and projects to the nucleus accumbens. Alcohol- or drug-taking results in a dopamine reward that stimulates its taking. Pavlovian conditioning to environmental cues (e.g., sights, smells, and sounds of a bar) that precede use become associated with use of the drug. Notably, this sense of “reward,” which confers evolutionary fitness, is more likely to be perceived as crucial than even that produced by natural, survival-oriented stimuli (e.g., food, sex). This conditioning is reflective of synaptic strengthening mediated by the glutamatergic system, with neuroplasticity changes in brain areas thought to mediate drug- taking behavior, including the amygdala (stress and anxiety), hippocampus (memory), and dorsal striatum (routine motor movements). Natural stimuli (e.g., food, sex, other previously pleasurable activities) become less enjoyable, resulting in a profound state of anhedonia. With time, alcohol use disorders become ingrained. Ultimately, this preference for alcohol compared to natural rewards is mediated through a process of “bad learning,” or neuroplasticity changes in the extended amygdala, also referred to as the antireward system. The anti- reward system involves stress-response hormones, including corticotrophin-releasing hormone and dynorphin. Long- or short-term abstinence activates the antireward system, and with more abstinence, it becomes even more difficult to ignore with the attendant anxiety, dysphoria, craving, and anhedonia. Over time, with repeated administration, nucleus accumbens dopamine receptors desensitize, leading to a functional decrease in available dopamine, anhedonia, and decreased sense of pleasure. Real-world examples include an individual with alcohol dependence developing a sudden craving for a drink when watching a beer commercial, walking by a bar, or seeing a place where s/he drinks. This stage reveals one of the remarkable properties of addiction; the act of drug-taking transitions from being impulsive (i.e., pleasure-seeking without afterthought) to compulsive (i.e., undertaken to relieve stress, tension, or physical signs such as pain).
Alcohol use disorders are often associated with dependence on or abuse of other substances, such as marijuana, cocaine, opioids, amphetamines, anxiolytics, designer or “club drugs,” and tobacco. Alcohol may be used to alleviate the unwanted effects of these other substances or to augment their effects or substitute for them when they are not available. Cocaine According to the most recent National Survey on Drug Use and Health, about 5.2 million Americans 12 years of age and older were past year cocaine users in 2019 [12]. Many cocaine addicts also use alcohol to enhance euphoria, to reduce the mania associated with intoxication, or to calm or reduce the impact of dysphoria caused by cocaine withdrawal. Use of cocaine impairs both mental and physical functions, including learning and memory, hearing and seeing, motor coordination, speed of information processing, and problem-solving ability. Alcohol use has its own set of impairments, but many overlap with cocaine use. The negative impact exerted by alcohol and cocaine on either mental or physical activities has been found to be greater than when either is used alone. This is due to the production of a compound called cocaethylene. Cocaethylene is a novel compound that is produced in the bodies of individuals using cocaine and alcohol. Cocaethylene has been linked to cardiotoxicity, neurotoxicity, overdose deaths, and acute functional impairment [242; 243]. The combination of cocaine and alcohol may be associated with other neurologic changes, including poor memory and poorer judgment. Alcohol use can also be a trigger for cocaine relapse. Nicotine Addiction As many as 50% of persons with alcohol use disorder smoke, compared with about 18% of the general population [12; 244]. In a cohort study of 845 persons who had been treated for alcohol use disorder, more than 25% of the sample had died within 12 years [245]. Approximately one-half of the deaths were related to tobacco use and one-third were related to alcohol. Smoking and excessive alcohol use are risk factors for cardiovascular and lung diseases and some forms of cancer. Compared to nonsmoking nondrinkers, the risk for developing mouth and throat cancer is seven times greater for those who use tobacco, six times greater for those who use alcohol, and 300 times greater for those who use both tobacco and alcohol [246]. Both nicotine and alcohol consumption cause the release of dopamine in the nucleus accumbens. Neurobiology may make the combination of the two substances more rewarding than if either substance was taken alone. Certain enzymes in the liver (i.e., microsomal enzymes) convert some of the ingredients found in tar from cigarette smoke into chemicals that can cause cancer [247]. Long-term excessive alcohol consumption may activate these enzymes as well as decrease the body’s ability to respond to infections or abnormal states. Smoking and excessive alcohol use are significant risk factors for cancer of the mouth, throat, and esophagus [246].
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MDMI1826
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