> Brain Injury Glossary
> Brain Injury Terms
Starting with "P"
> Persistent Unawareness
transition of a person who remains unconscious from a state of “Coma”
to one of “vegetative behaviors” reflects subtle changes over a
period of several weeks from a condition of not response to the
internal or external environment (except reflexively) to a state of
wakefulness but with no indication of awareness (cortical function).
A patient in this state may have a range of biological
responses at the sub-cortical level such as eye opening (with sleep
and wake rhythms) and sometimes the ability to follow with their
Normal levels of blood pressure and respiration (vegetative
functions) are maintained automatically.
The label “persistent” is not applicable until the person
has been unconscious for a year or more.
Also called Coma Vigil.
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