Development and external validation of a new PTA assessment scale

Area of Science:

• Neurology
• Trauma Care
• Clinical Assessment

Background:

• Post-traumatic amnesia (PTA) is a critical indicator following traumatic brain injury (TBI).
• Accurate PTA assessment is vital for effective clinical management of TBI patients.
• Existing PTA scales may lack practicality or examiner independence.

Purpose of the Study:

• To develop and externally validate a concise, examiner-independent PTA scale.
• To identify the most discriminative items from existing PTA scales.
• To incorporate a three-word memory test into the new PTA assessment tool.

Main Methods:

• Two cohorts (derivation and validation) assessed mild, moderate, and severe TBI patients and controls.
• Items from existing PTA scales were evaluated for sensitivity and specificity in discriminating TBI patients from controls.
• A new PTA scale was constructed based on selected discriminative items and validated using Receiver Operating Characteristic (ROC) analysis.

Main Results:

• The study included 126 TBI patients and 31 controls in the derivation cohort, and 132 TBI patients and 30 controls in the validation cohort.
• A seven-item scale was developed, including age, hospital name, time, day, month, mode of transport, and three-word recall.
• The new PTA scale demonstrated sufficient discriminative ability compared to existing scales across three administrations in the validation cohort.

Conclusions:

• A valid, practical, and examiner-independent PTA scale has been developed.
• The scale is suitable for assessing mild TBI patients in emergency settings.
• The scale remains valuable for monitoring recovery in patients with more severe TBI.