Online communication between school and home. Online communication between home and school is the use of digital telecommunication to convey information and ideas between teachers, students, parents, and school administrators.
In more severe cases a coma may last for over five weeks, while some have lasted as long as several years. After this time, some patients gradually come out of the coma, some progress to a vegetative state, and others die. Some patients who have entered a vegetative state go on to regain a degree of awareness. Others remain in a vegetative state for years or even decades (the longest recorded period being 42 years). The outcome for coma and vegetative state depends on the cause, location, severity and extent of neurological damage.
By Mayo Clinic Staff. A coma is a state of prolonged unconsciousness that can be caused by a variety of problems â traumatic head injury, stroke, brain tumor, drug or alcohol intoxication, or even an underlying illness, such as diabetes or an infection. A coma is a medical emergency. Swift action is needed to preserve life and brain function. Doctors normally order a battery of blood tests and a brain CT scan to try to determine what's causing the coma so that proper treatment can begin.