coma-, -coma

(Greek: from Modern Latin which came from Greek koma, komatos, "deep sleep")

coma (s) (KOH mah) (noun), comas (pl)
1. A condition of deep, often prolonged unconsciousness, usually the result of an injury, a disease, or a poison, in which a person is incapable of sensing or responding to external stimuli and internal needs: "Jeremy was at the hospital in a state of deep and prolonged coma as a result of the injury he suffered in the car accident."
2. A prolonged situation of a deep sleep marked by the absence of normal eye movements, no responses even to painful stimuli, and the inability to speak: "It is believed that more than 50% of comas are caused by trauma to the head or to circulatory accidents in the brain because of hypertension, arteriosclerosis, thrombosis, tumor, abscess formation, or insufficient blood flow to the brain."
3. Etymology: from Greek koma; genitive form, komatos, "deep sleep, lethargy"; which is probably related to kamnein, "to toil, to be sick" or "to be worn out, to suffer".

It may also be indirectly related to koimetr-, "sleeping".

An Extensive Explanation about Comas

As is often stated, a coma is a condition of unconsciousness and a lack of normal responses which is distinguishable from sleep in that the person does not respond to stimulants; such as, shouting, shaking, or pinching; nor to his or her inner needs; such as, emptying the bladder of urine.

A severe injury can cause immediate unconsciousness, which may last for only a few seconds or it may continue for weeks. When unconsciousness persists over a longer period, a person is commonly said to be "in a coma".

Comas are caused by disturbances or damages to areas of the brain involved in conscious activity or the maintenance of consciousness; especially, in parts of the cerebrum (the main mass of the brain), the upper parts of the brain stem, and the central regions of the brain.

The damage may be the result of a head injury, or of an abnormality; such as, a brain tumor, brain abscess, or intracerebral hemorrhage; all of which can be determined by brain imaging techniques.

Quite often, commas have been a result of buildups of poisonous substances which intoxicate brain tissues that are caused by drug overdoses, advanced liver or kidney diseases, acute alcoholic intoxications, or in uncontrolled diabetes mellitus (a chronic condition associated with abnormally high levels of sugar [glucose] in the blood and urine); or there may have been impairments of blood flow to some brain areas that lead to cerebral hypoxia (a lack of oxygen).

Encephalitis (inflammation of the brain) and meningitis (inflammation of the brain's protective coverings) can also cause comas.

Various depths of coma are recognized

In less severe forms, a person may respond to stimulation by saying a few words or perhaps by moving an arm or fingers.

In severe cases, the person fails to respond in this way to repeated vigorous stimuli; however, even deeply comatose patients may show some automatic responses; such as, continuing to breathe unaided, may cough, yawn, blink, and show roving eye movements, indicating that the lower brain stem, which controls these responses, is still functioning to some degree.

Variations can be recorded by systems that classify the coma depending on the person's verbal behavior, the movements he or she makes, and the condition of the eyes (whether they are open, closed, or looking around).

—Essentially compiled from information located in
The American Medical Association Home Medical Encyclopedia;
Medical Editor, Charles B. Clayman, MD; Random House, Inc.;
New York; 1989; page 294.
A prolonged and deep unconscoucioness.
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A condition of insensibility caused by an accident.
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comal (adjective), more comal, most comal
Conveying or pertaining to, a deep sleep or a condition of unconsciousness.
comatose (adjective), more comatose, most comatose
1. In a state of deep and usually prolonged unconsciousness.
2. A condition in which a person is unable to react to anything that usually causes a physical reaction.
3. Unable to function or being in a very tired or drunken state.

Stedman's Medical Dictionary, 28th edition, warns readers to "avoid the illegitimate form, comatosed".

Dull and inactive, in a stupor.
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Abnormally sleepy and lacking action.
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comatosely (adverb), more comatosely, most comatosely
Relating to the state of being unconscious and unable to wake up; marked by lethargy or an extreme lack of energy.
narcoma (s) (noun); narcomas, narcomata (pl)
A daze or unconsciousness where a person isn't speaking or thinking clearly that is caused by hypnotic or narcotic drugs.
narcomatous (adjective), more narcomatous, most narcomatous
Pertaining to, inducing, or affected by near unconsciousness that is produced by using drugs.
precoma (s) (noun), precomas (pl)
The neuropsychiatric state preceding a coma, as in hepatic encephalopathy (a brain dysfunction directly a result of a liver dysfunction, most often recognized in advanced liver disease): The precoma that is caused by hepatic encephalopathy will cause disturbances of consciousness and progress to a coma.
psychocoma (s) (noun), psychocomas (pl)
A condition in which a person is in a state of mental stupor or who has less ability to respond mentally or physically.