External Validation of the Post-Concussion Symptoms Rule for Predicting Mild Traumatic Brain Injury Outcome.

Area of Science:

• Neurology
• Traumatology
• Clinical Decision Rules

Background:

• Persistent symptoms are common following mild traumatic brain injury (mTBI).
• The Post-Concussion Symptoms (PoCS) Rule is a new clinical decision tool designed to predict persistent post-concussion symptoms (PPCS) three months after mTBI.
• The PoCS Rule incorporates demographic, clinical characteristics, and headache presence from the emergency department (ED) and symptom scores at seven days post-injury.

Purpose of the Study:

• To validate the performance of the PoCS Rule in an independent sample of mTBI patients.
• To assess the sensitivity, specificity, and overall performance (AUC) of the PoCS Rule in predicting PPCS.
• To evaluate the utility of follow-up symptom assessment for risk stratification after mTBI.

Main Methods:

• Analysis of data from a clinical trial involving 236 participants with mTBI recruited from EDs.
• Participants were randomized to a usual care control group.
• The Rivermead Postconcussion Symptoms Questionnaire was administered at three months post-injury to determine PPCS, defined by the PoCS Rule authors.

Main Results:

• Over 40% of participants reported PPCS at three months.
• The PoCS Rule demonstrated high sensitivity (93% lower threshold, 85% higher threshold) but low specificity (28% lower threshold, 37% higher threshold).
• The overall performance of the PoCS Rule was modest, with an AUC of 0.61.

Conclusions:

• The PoCS Rule is sensitive in identifying patients with persistent post-concussion symptoms after mTBI.
• The rule's low specificity in this independent sample indicates a high rate of false positives.
• Incorporating follow-up symptom assessments can enhance the accuracy of risk stratification for mTBI patients.