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Aside from chemical components which may cause a predisposition to alcohol dependence and blackouts, expectations of alcohol use may predispose drinkers toward alcoholism and blackouts. In a study of 123 college students significant correlations were found between students' alcohol expectancies, level of alcohol use, and blackout history.
It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes: Shock, such as hypovolemia, even in mild form such as when drawing blood.
Among specific causes of amnesia are the following: Electroconvulsive therapy in which seizures are electrically induced in patients for therapeutic effect can have acute effects including both retrograde and anterograde amnesia. [23] Alcohol can both cause blackouts [24] and have deleterious effects on memory formation. [25]
Unconsciousness may occur as the result of traumatic brain injury, brain hypoxia (inadequate oxygen, possibly due to a brain infarction or cardiac arrest), severe intoxication with drugs that depress the activity of the central nervous system (e.g., alcohol and other hypnotic or sedative drugs), severe fatigue, pain, anaesthesia, and other causes.
Blackout – a complete loss of vision but retaining consciousness; and; G-LOC – where consciousness is lost. Under negative g, blood pressure will increase in the head, running the risk of the dangerous condition known as redout, with too much blood pressure in the head and eyes.
How can we avoid blackouts? If the blackouts are caused by a lack of supply, then the only way is to reduce demand at particular times. Most demand happens during peak hours of between around 4pm ...
Reflex syncope can occur in otherwise healthy individuals, and has many possible causes, often trivial ones such as prolonged standing with the legs locked. [ citation needed ] The main danger of vasovagal syncope (or dizzy spells from vertigo) is the risk of injury by falling while unconscious.
The “blackout challenge,” which encourages individuals to asphyxiate themselves to the point of losing consciousness, falls into the latter. It is extremely dangerous.