The timing and value of early postoperative computed tomography after head surgery in traumatic brain injury patients

To analyze the timing of the early postoperative computed tomography (CT) in traumatic brain injury (TBI) patients, and compare CT and neurological examination (NE) findings.

Retrospective analysis included 353 TBI patients admitted to two level 1 trauma centers (2016-2020) who underwent head surgery and postoperative CT within 24 h. Analyzed variables: age, Injury Severity Score (ISS), Glasgow Coma Score (GCS), Abbreviated Injury Scale head (AISh), comorbidities, CT and NE findings and timing, head surgery type, and mortality.

Patients mean age was 61.9 years, ISS 25.1, GCS 11.0, AISh 4.7. Postoperatively, mean time to first positive CT was 6.1 h and to first positive NE was 13.2 h. Positive CT alone was more accurate in identifying need for 2nd head surgery than positive NE alone (21.8 % vs 6.0 %, p = 0.04). There was no difference between patients with CT done earlier than 6 h compared to patients with CT done after 6 h in mortality (26.1 % vs 22.0 %, p = 0.4) or 2nd surgery rate (12.2 % vs 12.2 %, p = 1.0). Reversal of postoperative CT findings occurred in 1/6 of patients and was more common when CT was done earlier than 6 h compared to CT done later (25.7 % vs 0.8 %, p < 0.001). Early CT within 1 h rarely leads to the change of management but often is followed by another CT within 12 h.

In TBI patients postoperative CT was more effective than NE in predicting a need for 2nd head surgery. Postoperative head CT at 6 h is recommended to allow timely detection of intracranial deterioration, reduce the number of CTs and reversal findings as it does not increase 2nd surgery rates and mortality.