Interhospital Variation in Operative Intervention for Firearm-Related Penetrating Traumatic Brain Injury and Associations With Inpatient Mortality.

Background and objectives: Firearm-related penetrating traumatic brain injury (pTBI) carries a high mortality risk and grim prognosis. This study aimed to quantify interhospital variation in operative intervention for this patient population and assess whether cranial surgery tendency is associated with inpatient mortality.

Methods: We conducted a retrospective cohort study using the American College of Surgeons Trauma Quality Improvement Program (TQIP) data set to identify adult patients presenting with firearm-related pTBI. Risk-adjusted hierarchical regression evaluated associations with cranial surgery. Hospitals were stratified into quartiles based on surgical tendency (lowest, quartile 1; highest, quartile 4 [Q4]). Propensity score matching was performed across quartiles, and a multivariable regression model was constructed to investigate associations between hospital quartile and inpatient mortality. Effect modification by pupillary reactivity was tested.

Results: Cranial surgery rates for 4895 patients (median age, 31 years) varied widely across 309 hospitals (0%-71%; median, 21%; median odds ratio, 1.33). After matching, treatment at Q4 hospitals was associated with significantly reduced odds of mortality compared with treatment at quartile 1 hospitals (odds ratio, 0.61; 95% CI, 0.47-0.78). Patients presenting with one (interaction P = .03) or both (interaction P = .03) unreactive pupils experienced amplified survival benefits from treatment at Q4 hospitals.

Conclusion: Substantial interhospital variation exists in operative intervention for firearm-related pTBI. Hospitals with higher surgical tendency were associated with improved survival, and this effect was amplified for patients presenting with unreactive pupils. These findings suggest a need to standardize operative decision-making for patients with firearm-related pTBI, aligning with ongoing efforts by organizations such as the Brain Trauma Foundation.