Contemporary issues in mild traumatic brain injury

Area of Science:

• Neuroscience
• Traumatology
• Clinical Neurology

Background:

• Mild traumatic brain injury (TBI) diagnosis and the nature of persistent postconcussive syndrome are complex clinical issues.
• Establishing clear diagnostic criteria for mild TBI is crucial for accurate patient management.
• The nosologic status of persistent postconcussive syndrome remains a subject of debate.

Purpose of the Study:

• To define minimum criteria for the clinical diagnosis of mild TBI in adults.
• To investigate whether persistent postconcussive syndrome is a distinct nosologic entity.

Main Methods:

• Comprehensive literature search of PubMed (MEDLINE) for head injury studies from 1977 to 2002.
• Inclusion of reviews and studies on mild TBI and persistent postconcussive syndrome, with control groups.
• Methodologic quality assessment based on American Academy of Neurology criteria.

Main Results:

• Mild TBI diagnosis begins with altered awareness and amnesia following a craniofacial blow.
• Amnestic scales are more effective than the Glasgow Coma Scale for grading mild TBI and setting inclusion criteria.
• Prolonged cognitive impairment is not exclusive to brain trauma; neuropsychological tests and self-reported symptoms are not primary evidence for mild TBI.

Conclusions:

• Persistent postconcussive syndrome in mild TBI without focal injury is biologically linked to other posttraumatic syndromes.
• Further research into limbic neuronal attrition as a response to pain and stress is needed to understand persistent cognitive and behavioral sequelae.