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Alertness and being oriented to place and time are major characteristics of consciousness. Alertness means that you are able to respond appropriately to the people and things around you. You are oriented when you know who you are, where you are, where you live, and what time it is.
When consciousness is decreased, your ability to remain awake, aware, and oriented is impaired. Impaired consciousness is a medical emergency.
The brain is the main organ responsible for maintaining consciousness. Your brain requires adequate amounts of oxygen and glucose in order to function properly. Many substances you consume affect your brain chemistry and can help to maintain or decrease consciousness.
For example, caffeine is a stimulant, which means that it stimulates brain activity. Caffeine can be found in many foods you eat every day, such as coffee, soda, and chocolate. Painkillers and tranquilizers make you drowsy. This side effect is a form of impaired consciousness. Diseases that damage your brain cells can also cause impaired consciousness. Coma is most severe level of consciousness impairment.
Levels of impaired consciousness include: confusion, disorientation, delirium, lethargy, stupor, and coma.
Confusion is marked by the absence of clear thinking and may result in poor decision-making.
Disorientation is the inability to understand how you relate to people, places, objects, and time. The first stage of disorientation is when you are disoriented with respect to time (years, months, days). This is followed by disorientation with respect to place, which means you may not know where you are. Loss of short-term memory follows disorientation with respect to place. The most extreme form of disorientation is when you lose the memory of who you are.
If you are delirious, your thoughts are confused and illogical. People who are delirious are often disoriented. Their emotional responses range from fear to anger. People who are delirious are often highly agitated.
Lethargy is a state of decreased consciousness that resembles drowsiness. If you are lethargic, you may not respond to stimulants like the sound of an alarm clock or the presence of fire.
Stupor is a deeper level of impaired consciousness in which it is very difficult for you to respond to any stimuli, except for pain.
Coma is the deepest level of impaired consciousness. If you are in a coma, you cannot respond to any stimulus, not even pain.
Symptoms that may be associated with decreased consciousness are:
Drugs, alcohol, substance abuse, drug overdose, certain medications, epilepsy, low blood sugar, stroke, and lack of oxygen to the brain are common causes of decreased consciousness.
Other underlying causes of decreased consciousness include:
Diagnosis and treatment of decreased consciousness begins with a complete medical history and physical examination, which includes a detailed neurological evaluation. Medical personnel will want to know about any medical problems you have (such as diabetes, epilepsy, or depression), and any medications you are taking (such as insulin or anticonvulsants). They will also ask if you have a history of abusing illegal or prescription drugs or alcohol.
In addition to your complete history and physical, the doctor may order the following tests:
Treatment for decreased consciousness depends upon its underlying cause. Your outlook worsens the longer you spend less than fully consciousness.
Written by: Verneda Lights
Medically reviewed by George Krucik, MD
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