The classical definition of coma denotes unarousable unresponsiveness with absent sleep–wake cycles and closed eyes, but comatose patients may defy that definition by showing eye-opening early after brain injury.
As soon as patients open their eyes, they are said to “awaken” from the coma. This does not, however, mean that a person is conscious. Most patients who awaken from a coma soon recuperate. But a minority will succumb to brain death; a brain that is dead is completely destroyed and cannot recover.
Usually, coma patients have their eyes closed and cannot see what happens around them. But their ears keep receiving sounds from the environment. In some cases, the brains of coma patients can process sounds, for example the voice of someone speaking to them [2].
Can Your Loved One Hear You? During a coma, the individual is unconscious, meaning they are unable to respond to any sounds. However, the brain may still be able to pick up on sounds from loved ones. In fact, some studies suggest talking and touching a loved one while they are in a coma may help them recover.
Hence, they are neither awake nor aware. Coma is a time-limited condition (it usually does not last longer than a few weeks) leading either to brain death (i.e., permanent loss of brainstem functions), a VS/UWS or the recovery of consciousness.
Typically, a coma does not last more than a few days or couple of weeks. In some rare cases, a person might stay in a coma for several weeks, months or even years. Depending on what caused the person to go into a coma, some patients are able to return to their normal lives after leaving the hospital.
Whether they dream or not probably depends on the cause of the coma. If the visual cortex is badly damaged, visual dreams will be lost; if the auditory cortex is destroyed, then they will be unable to hear dreamed voices.
A person may appear fine, but will not able to speak or respond to commands. Spontaneous movements may occur, and the eyes may open in response to external stimuli. Individuals may even occasionally grimace, cry, or laugh.
Severe brain injury is usually defined as being a condition where the patient has been in an unconscious state for 6 hours or more, or a post-traumatic amnesia of 24 hours or more. These patients are likely to be hospitalised and receive rehabilitation once the acute phase has passed.
People who do wake up from a coma usually come round gradually. They may be very agitated and confused to begin with. Some people will make a full recovery and be completely unaffected by the coma. Others will have disabilities caused by the damage to their brain.
Closed eyes. Depressed brainstem reflexes, such as pupils not responding to light. No responses of limbs except for reflex movements. No response to painful stimuli except for reflex movements.
Coma is a state of consciousness that is similar to deep sleep, except no amount of external stimuli (such as sounds or sensations) can prompt the brain to become awake and alert. A coma is a medical emergency.
Someone in a vegetative state can show signs of wakefulness – for example, they may open their eyes, but not respond to their surroundings. In rare cases, a person may demonstrate some sense of response that can be detected using a brain scan, but not be able to interact with their surroundings.
The person is still alive, but the brain is functioning at its lowest stage of alertness. You can't shake and wake up someone who is in a coma like you can someone who has just fallen asleep.
Annie Shapiro (1913–2003) was a Canadian apron shop owner who was in a coma for 29 years because of a massive stroke and suddenly awakened in 1992. Apart from the patients in the true story Awakenings, Shapiro was the longest a person has been in a coma like state and woken up.
A vegetative state is similar to a coma but isn't the same. People in a vegetative state have recovered enough that they aren't in a coma, but their brain's abilities and activity are still very limited. The potential for recovery from a vegetative state varies widely.
Post-traumatic amnesia typically occurs after a survivor wakes up from a coma, a period of unconsciousness. During this time the survivor may not be able to recall certain memories. This can last from a few minutes to a couple weeks, depending on the severity of the brain injury.
And the answer is yes. The brain is incredibly resilient and possesses the ability to repair itself through the process of neuroplasticity. This phenomenon is the reason why many brain injury survivors can make astounding recoveries.
Severe injuries can cause permanent unconsciousness. Of people with severe injuries, 60% to 80% survive. Many of those who survive are completely unconscious for some period.
D.M., F.R.C.P. Summary A case of pituitary coma with continuing menstruation is presented. This association is extremely rare, but a history of recent menstrual periods does not exclude advanced hypopituitarism from the differential diag- nosis of severe hyponatraemia.
Coma patients are monitored carefully through the following four stages of recovery before they can determine the full extent of their brain injury and prognosis.
Coma patients might feel pleasure and pain like the rest of us.
"Pulling the plug" would render the patient unable to breathe, and the heart would stop beating within minutes, he said. But if a patient is not brain dead and instead has suffered a catastrophic neurological brain injury, DiGeorgia said, he or she could breathe spontaneously for one or two days before dying.
The chances of someone recovering from a coma largely depend on the severity and cause of their brain injury, their age and how long they've been in a coma. But it's impossible to accurately predict whether the person will eventually recover, how long the coma will last and whether they'll have any long-term problems.
People in a coma are completely unresponsive. They do not move, do not react to light or sound and cannot feel pain. Their eyes are closed. The brain responds to extreme trauma by effectively 'shutting down'.