Withdrawal from drugs and alcohol is a common medical problem widely prevalent in many countries. The withdrawal response after discontinuation of a particular drug or alcohol can depend on the length and quantity of use(. There is tremendous variability in the withdrawal response depending on the duration of use. When people consume alcohol for at least 1 to 3 months or even consume large quantities for at least seven to ten days, the withdrawal response can occur within 6 to 24 hours after cessation of alcohol. The withdrawal symptoms are relieved immediately by consuming additional alcohol.
The human body attempts to maintain homeostasis. When a substance is removed from the body, the residual counter-regulatory mechanisms produce unopposed effects, and withdrawal symptoms occur.
Alcohol intoxication and withdrawal are complex. Most effects can be explained by the interaction of alcohol with neurotransmitters and neuroreceptors including gamma-aminobutyric acid (GABA) and glutamate (NMDA),. The changes in the inhibitory and excitation neurotransmitters disrupting the neurochemical balance in the brain, causing symptoms of withdrawal. Ethanol inhibits opioid binding to P-opioid receptors, and long-term use results in the upregulation of opioid receptors. Opioid receptors in the nucleus accumbens and the ventral tegmental area of the brain modulate ethanol-induced dopamine release, this, in turn, produces alcohol craving and use of opioid antagonists to prevent this craving .
In opioid or benzodiazepine addiction, chronic stimulation of specific receptors for these drugs suppresses endogenous production of neurotransmitters, endorphins or GABA. Removal of the exogenous drug allows unopposed counter-regulatory effects. When the exogenous drug is removed, inadequate production of endogenous transmitters and unopposed stimulation by counter-regulatory transmitters results in withdrawal symptoms. The time it takes to restore homeostasis by the synthesis of endogenous transmitters determines the onset of withdrawal symptoms.
Withdrawal from drugs and alcohol is a common medical problem. According to data from the National epidemiologic survey on alcohol and related conditions, the estimated lifetime prevalence of alcohol use disorder was 12.8% and 4.8% annually. About 20% of adults in the emergency room may suffer from alcohol use disorder and about 4-40% of patients admitted to ICU will have alcohol withdrawal symptoms(AWS). Only 24% of patients with alcohol use disorder were ever treated.. Patients who have AWS have an increased length of hospital stay and increased mortality than those who do not have AWS. Chronic alcoholism and withdrawal are more common in men than in women. The mortality rate from alcohol withdrawal and DT is high if untreated.
As many as 5% of these patients may develop delirium tremens (DT) when they withdraw from chronic alcohol use. The number of people addicted to opioids, sedatives, and stimulants is not known. Though benzodiazepine withdrawal is a medical emergency due to the onset of withdrawal seizures, benzodiazepine intoxication is relatively benign. Opiate withdrawal is uncomfortable, but fatalities are rare. Withdrawal from cocaine and amphetamine results in sedation and a state resembling adrenergic blockade, death is rare.
The signs and symptoms of alcohol withdrawal may range from a simple tremor to a fully blown delirium tremens characterized by autonomic hyperactivity, tachypnea, hyperthermia, and diaphoresis. About 25% of patients may develop alcohol hallucinations. Some patients with alcohol use disorder may also develop seizures which are brief.
On exam, the alcoholic withdrawal signs and symptoms may include hyperventilation, tachycardia, tremor, hypertension, diaphoresis, or hypothermia. Signs of chronic alcoholism may include spider angiomata, flushed facies, paralysis of extraocular muscles (Wernicke encephalopathy), poor dentition, skull or facial trauma (as a result of falls) and tongue lacerations (biting tongue during seizures). Other features of chronic alcohol use disorder include ascites, hepatosplenomegaly, and melena. Thinning of hair, spider angioma, and gynecomastia are all also seen in patients with chronic alcohol use disorder.
Many patients with alcohol withdrawal have additional medical or traumatic conditions that may increase their associated risk of morbidity and mortality. Risk factors associated with increased mortality include cirrhosis, the presence of DTs at the time of diagnosis, the existence of underlying chronic pathology other than liver disease, and a need for endotracheal intubation.
Barbiturates and Benzodiazepines
Use of sedatives like barbiturates and benzodiazepines can also produce withdrawal responses that resemble alcohol withdrawal syndrome. Autonomic and psychomotor dysfunction often characterize the withdrawal symptoms. The symptoms tend to develop 2 to 10 days after discontinuation of the agent. Gamma Hydroxybutyrate (GHB) is now a common club drug abused at nightclubs and all-night parties. The withdrawal response is mild, resembles a sedative withdrawal syndrome with psychotic symptoms. Severe withdrawal symptoms tend to occur in chronic users and can also present with seizures and rhabdomyolysis.
Opiate withdrawal response is usually mild and not life-threatening. It usually resembles a flu-like illness characterized by yawning, sneezing, rhinorrhea, nausea, diarrhea, vomiting, and dilated pupils. Depending on the half-life of the drug, the symptoms may last for three to ten days. Also, individuals who abuse IV drugs are prone to infections like endocarditis, osteomyelitis, cellulitis, hepatitis, and septic emboli. Patients with Opioid Use disorder may have signs of a cough, hemoptysis, and tachypnea due to opportunistic infections as a result of acquiring HIV and PCP. IV drug users may have scars and needle marks.
Cocaine and Amphetamines
Central nervous system (CNS) stimulants like cocaine and amphetamine can also produce withdrawal symptoms. Like opioids, the withdrawal symptoms are mild and not life-threatening. Often the individual will develop marked depression, excessive sleep, hunger, dysphoria, and severe psychomotor retardation but all vital functions are well preserved. Recovery is usually slow, and depression can last for several weeks.
Patients in alcohol withdrawal may have numerous potentially life-threatening medical problems. Administration of intravenous glucose to patients with seizures is controversial because this is thought to precipitate acute Wernicke encephalopathy in chronic alcoholism unless thiamine is also administered. A benzodiazepine can be administered to control seizures. If the patient has hypoglycemia, dextrose 50% in water (D50W) 25 mL to 50 mL and Thiamine 100 mg intravenously (IV) is also indicated. Low doses of clonidine can help reverse central adrenergic discharge, relieving tachypnea, tachycardia, hypertension, tremor, and craving for alcohol. In an agitated patient, neuroleptics such as haloperidol 5 mg IV or intramuscularly (IM) may be added to sedative-hypnotic agents as an adjunctive therapy. Caution must be taken because haloperidol may decrease the seizure threshold as well as prolong the QT interval.
Patients with chronic opioid Use disorder needs a medication taper with buprenorphine, a partial opioid agonist. Withdrawal symptoms should be assessed with the Clinical Opiate Withdrawal Scale (COWS). COWS is an 11-item scale is used to identify withdrawal symptoms and treatment response. Opioid withdrawal is treated with a long-acting opioid agonist, such as methadone or buprenorphine. Clonidine, an alpha agonist may also decrease the severity of symptoms. Long-acting benzodiazepines may be used to control insomnia and muscle cramps.
Sedative-hypnotic withdrawal is treated with substituting drugs that have a long duration of action, benzodiazepine or phenobarbital for a few days followed by a decreasing dose over 2 to 3 weeks.
GHB withdrawal can initially be treated with high doses of benzodiazepines, refractory cases have responded to pentobarbital, chloral hydrate, and baclofen.
Stimulant-withdrawal syndrome is treated with observation.
Patients with DTs or other severe withdrawal symptoms may require admission to the intensive care unit due to the risk of mortality.
Patients with chronic alcoholism or intravenous drug use should be evaluated for inpatient and outpatient treatment programs. Treatment programs are only successful if the patient is motivated. Often individuals dependent on opiates should be started on methadone or buprenorphine.
Psychiatric evaluation is strongly recommended to rule out mental health concerns such as suicidal ideation, major depression, and poly-substance abuse.
The management of patients undergoing withdrawal symptoms involve multiple specialties. The severity of the withdrawal symptoms depends on the type of agent and duration of use. Some patients with mild withdrawal symptoms can be managed as outpatients but those with severe alcohol withdrawal with a history of seizures and DT may require admission. Besides a psychiatrist, other healthcare professionals that should be involved in the management of these patients include the internist, neurologist, pain specialist, intensivist, mental health nurse, pharmacist, and sometimes a cardiologist. The nurse should assist in patient monitoring and education. The pharmacist should evaluate for drug-drug interactions and assist in the selection and dosing of drugs used to control withdrawal symptoms. The outcomes depend on the agent ingested. For most patients, relapses and remissions are very common following addiction to drugs and alcohol. (Level V)
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