As used in this section and NRS 427A.850 and 427A.860, “traumatic brain injury” means a sudden shock or damage to the brain or its coverings which is not of a degenerative nature and produces an altered state of consciousness or temporarily or permanently impairs the mental, cognitive, behavioral or physical functioning of the brain. The term does not include:
1. A cerebral vascular accident;
2. An aneurism; or
3. A congenital defect.