Decompressive craniectomy for severe traumatic brain injury: Evaluation of the effects at one year.

OBJECTIVE: To assess the effect on outcome (1 yr) of decompressive craniectomy performed within or after the first 24 hrs post-trauma in severely head-injured trauma patients with intractable cerebral hypertension.

DESIGN: Retrospective cohort study.

SETTINGS: Intensive care unit of a university hospital.

PATIENTS: Among 816 patients with severe head trauma (Glasgow Coma Scale < or =8), 40 underwent decompressive craniectomy. After data collection, patients were divided into two groups: early and late decompressive craniectomy. An early decompressive craniectomy was performed within the first 24 hrs in patients according to the following criteria: a Glasgow Coma Scale score <6 and the existence of clinical signs of cerebral herniation (absence of pupillary reflexes), correlated with abnormalities in computed tomography scan including hematoma, appearance of diffuse or unilateral brain swelling, and/or cerebral herniation. The intracranial pressure in these patients was not measured before the decompressive craniectomy was performed. A late decompressive craniectomy (>24 hrs) was performed according to following criteria: an intractable intracranial hypertension with intracranial pressure >35 mm Hg, a unilateral or bilateral absence of pupillary reflexes, and the same abnormalities in computed tomography scan as previously described.

INTERVENTION: Twenty-seven patients with signs of cerebral herniation required the procedure at the time of initial evacuation of a mass lesion. In 13 patients, decompressive craniectomy was performed because of elevated intracranial pressure refractory to medical treatment consisting of cerebrospinal fluid derivation, deep sedation, osmotherapy, hyperventilation, and nesdonal or propofol.

MEASUREMENTS AND MAIN RESULTS: Five patients (19%) in whom an early decompressive craniectomy was performed had good recoveries (social rehabilitation), eight patients (30%) remained in a persistent vegetative state or with a severe disability, and 14 died (52%). On the other hand, the performance of late decompressive craniectomy in case of medical treatment failure was followed by social rehabilitation in five patients (38%) and death in three patients (23%). A persistent vegetative state or a severe disability was observed in five patients (38%). Meningitis or cerebral abscess occurred in six patients after decompressive craniectomy and were easily cured by antibiotic treatment.

CONCLUSIONS: In 40 patients with intractable intracranial hypertension and at very high risk of brain death, decompressive craniectomy allowed 25% of patients to attain social rehabilitation at 1 yr.