A coma is a deep state of prolonged unconsciousness in which a person cannot be awakened, fails to respond normally to painful stimuli, light, or sound, lacks a normal wake–sleep cycle and does not initiate voluntary actions. [1] .

: a state of profound unconsciousness caused by disease, injury, or poison. : a state of mental or physical sluggishness : torpor. : a tufted bunch (as of branches, bracts, or seed hairs) : the head of a comet consisting of a cloud of gas and dust and usually containing a nucleus.

2024年11月26日 · Coma is a state of prolonged loss of consciousness. It can have a variety of causes, including traumatic head injury, stroke, brain tumor, or drug or alcohol intoxication. A coma may even be caused by an underlying illness, such as diabetes or an infection.

2024年1月10日 · During a coma, a person is unresponsive to their environment. The person is alive and looks like they are sleeping. However, unlike in a deep sleep, the person cannot be awakened by any...

A coma is a medical emergency. If you’re with someone who’s unconscious and unresponsive, call 911 (or your local emergency services number) immediately. Many causes of coma need immediate medical care, and any delay could lead to dangerous complications or death. How common are comas?

COMA definition: 1. a state in which a person is unconscious and cannot be woken, caused by damage to the brain…. Learn more.

2024年5月25日 · A coma is a state of deep unconsciousness in which a person is unresponsive for a prolonged time. Although comas have many possible causes, they all involve temporary or permanent harm to the brain, impairing a person’s awareness of their surroundings and their ability to respond to them.

2022年2月4日 · A coma is a prolonged state of unconsciousness that occurs when a part of the brain is damaged, either temporarily or permanently. Learn about treatments and prognosis.

2023年4月24日 · A coma is a deep state of unconsciousness that can result from an injury or illness. In some cases, it lasts for just a few days, but in others, the person does not wake up.

Coma, from the Greek word "koma," meaning deep sleep, is a state of extreme unresponsiveness, in which an individual exhibits no voluntary movement or behavior.