Alcoholism Health Article

Immediate (acute) effects of alcohol use

Though the initial reaction to alcohol may be stimulatory, ultimately alcohol exerts a depressive, uninhibiting effect on the brain. The blood-brain barrier does not prevent alcohol from entering the brain, so the brain alcohol level quickly becomes equivalent to the blood alcohol level. Alcohol's depressive effects result in impaired thinking, feeling and judgment, short term memory loss, muscle weakness difficulty walking, poor balance, slurring of speech, and generally poor coordination (accounting for the increased likelihood of injury and alcohol related injury statistics). At higher alcohol levels, a person's breathing and heart rate slows. Vomiting may occur, with a high risk of vomitus "aspiration" (inhaling vomit into the lungs), and may result in further complications includingpneumonia. Still higher alcohol levels may result in coma and death.

Effects of long-term (chronic) alcoholism

Alcohol is considered a lethal poison, requiring continuous detoxification by the liver. As drinking continues and overwhelms the liver's ability to detoxify, long term consequences to health occur, affecting virtually every organ system of the body.

NERVOUS SYSTEM. It is estimated that 30–40% of all men in their teens and twenties have experienced alcoholic blackout (loss of consciousness) as a result of drinking a large quantity of alcohol. In an alcoholic blackout, all memory of time and behavior surrounding the episode of drinking is lost. Alcohol causes sleep disturbances, thus affecting overall sleep quality. Numbness and tingling may occur in the arms and legs. Two conditions that may occur either together or separately are Wernicke's and Korsakoff's syndromes. Both are due to the depleted thiamin levels found in alcoholics. Wernicke's syndrome results in disordered eye movements, very poor balance, and difficulty walking, while Korsakoff's syndrome severely affects one's memory, preventing new learning from taking place.

GASTROINTESTINAL SYSTEM. Alcohol causes a loosening of the muscular ring (the cardiac sphincter) that prevents the stomach's contents from reentering the esophagus. As a result, acid from the stomach flows upward into the esophagus, burning those tissues and causing pain and bleeding, or gastro-esophageal reflux disease (GERD). Inflammation of the stomach can also result in bleeding (ulcers) and pain as well as a decreased desire to eat. A major cause of severe, uncontrollable bleeding (hemorrhage) in an alcoholic is the development in the esophagus of enlarged (dilated) blood vessels, which are called esophageal varices (varicose veins of the esophagus). These varices actually develop in response to the toxic effect of alcohol on the liver, and are extremely prone to bursting and hemorrhage.

A malnourished state arises from the loss of appetite for food—due to caloric substitution of alcohol and its effects on blood sugar levels—and interference with the absorption of nutrients throughout the intestinal tract. Inflammation of the pancreas (pancreatitis) is a serious and painful problem in alcoholics that disrupts carbohydrate and fat digestion, and increases the risk of insulin resistance, weight gain, hyperlipidemia, diabetes, and pancreatic cancer. Diarrhea is also a common symptom of chronic alcohol use, due to alcohol's effect on the pancreas.

LIVER. Because alcohol is broken down (metabolized) within the liver, that organ is severely affected by constant levels of alcohol. Alcohol interferes with the large number of important chemical processes that occur in the liver. As alcohol converts to blood sugar, which in turn converts to blood fat, the liver begins to enlarge, filling with fat, a condition called fatty liver. Cirrhosis, a potentially deadly complication, develops when fibrous tissue, while trying to support the extra burden placed on the liver by the accumulation of fat and liver cell weakness, interferes with the liver's normal structure and function. The liver may also become inflamed, a condition called hepatitis, producing jaundice, fatigue, and elevated liver enzymes indicative of liver cell death and destruction. Because of the liver's enormous role in digestion, metabolism and immunity, damage to the liver takes a serious toll throughout the body.

BLOOD. Alcohol can cause changes to any of the types of blood cells. Red blood cells become abnormally large. White blood cells (important for fighting infections) decrease in number, resulting in a weakened immune system. This places alcoholics at increased risk for infections and is thought to account in part for an alcoholic's increased risk of cancer (ten times greater than normal). Platelets and blood clotting factors are affected, causing an increased risk of bleeding and hemorrhage, especially when coupled with vascular weaknesses, varices, or aneurism.

HEART AND CIRCULATORY SYSTEM. Small amounts of alcohol cause a drop in blood pressure, but increased use begins to raise blood pressure dangerously. Increased blood pressure negatively affects the kidneys. While some studies demonstrate that one to two alcoholic drinks per night improves heart disease risk values, higher amounts and chronic intake produce high levels of circulating fats, which increases the risk of heart disease. Heavy drinking results in an enlarged heart, coronary arterial disease (CAD), peripheral vascular disease, weakening of the heart muscle, abnormal heart rhythms, a risk of blood clots forming within the chambers of the heart, and a greatly increased risk of stroke. Strokes result when a blood clot from the heart enters the circulatory system, goes to the brain, and blocks a blood vessel. Stroke may also result from a hemorrhage within the brain, as weakened vessel walls give way and platelet deficient blood pours through.

REPRODUCTIVE SYSTEM. Heavy drinking has a negative effect on fertility in both men and women, decreasing testicular and ovarian size, interfering with sperm and egg production and viability, disrupting menstrual cycles, and reducing libido. When pregnancy is achieved reduced quality of sperm and egg may significantly and permanently affect the quality of life, pre-, peri- and postnatally, of the child. A child born to an alcohol using woman has a great risk of being born with fetal alcohol syndrome, which causes distinctive cranial and facial defects, including a smaller head size, shortening of the eyelids, and a lowered IQ. Developmental disabilities, heart defects, and behavioral problems are also more likely.