Predictors of withdrawal of life-sustaining therapies in older adults with TBI and a modified frailty index score.

Background: Withdrawal-of-life-sustaining-therapies (WLST) in patients with traumatic brain injury (TBI) is a complex decision-making process. The clinical factors related to WLST in older adults with TBI are currently poorly understood. The present study aims to determine the clinical predictors of WLST in older patients with TBI.

Methods: All patients ≥ 65 years old with TBI (Head Abbreviated Injury Scale Score ≥ 3) were identified from the Geriatric TBI Database, a prospective registry of patients admitted to 45 trauma centers nationwide with TBI between 2017-2019. We collected factors related to past medical history, baseline demographic data, clinical presentation, TBI sub-type, neurosurgical interventions, and do-not-attempt-resuscitation (DNAR) orders. The primary outcome measure was WLST. Binary logistic regression was subsequently performed to determine factors independently associated with WLST.

Results: A total of 1600 patients were identified. The median age was 80 years old and 48.6 % of patients were male. In this cohort, 120 patients (7.5 %) underwent WLST. A logistic regression model revealed that Glasgow Coma Scale (GCS) (OR 0.82; 95 %-CI 0.77--0.87), cerebral edema (3.2; 1.5-7.0), craniotomy/craniectomy (2.5; 1.4-4.4), and DNAR (8.8; 5.5-14.3) were all independently associated with WLST. This model demonstrated excellent discrimination ability with a concordance statistic of 0.935.

Conclusions: This study demonstrates that patients ≥ 65 years old with poor initial GCS, cerebral edema, craniotomy/craniectomy, and DNAR were all independently associated with WLST. Pre-injury frailty was not associated with WLST. Further studies are needed to evaluate the prognostic value of frailty indices in the management of patients with TBI.