Post-traumatic hydrocephalus - incidence, risk factors, treatment, and clinical outcome.

Post-traumatic hydrocephalus (PTH) is well-known after traumatic brain injury (TBI), but there is limited evidence regarding patient selection for ventriculo-peritoneal (VP)-shunt treatment. In this study, we investigated the incidence and risk factors for PTH and the indication for and outcome after shunt treatment. In this retrospective study, 836 TBI patients, treated at our neurointensive care (NIC) unit at Uppsala university hospital, Sweden, between 2008 and 2018, were included. Demography, admission status, radiology, treatments, and outcome variables were evaluated. Post-traumatic ventriculomegaly occurred in 46% of all patients at NIC discharge. Twenty-nine (3.5%) patients received a VP-shunt. Lower GCS M at admission, greater amount of subarachnoid hemorrhage, meningitis, decompressive craniectomy (DC), and ventriculomegaly at NIC discharge were risk factors for receiving a VP-shunt. Fourteen of the PTH patients showed impeded recovery or low-pressure hydrocephalus symptoms, of whom 13 experienced subjective clinical improvement after shunt treatment. Five PTH patients showed deterioration in consciousness, of whom four improved following shunt treatment. Five DC patients received a shunt due to subdural hygromas (n =2) or external brain herniation (n = 3), of whom two patients improved following treatment. Five patients were vegetative with concurrent ventriculomegaly and these patients did not have any positive shunt response. Altogether, 19 (66%) PTH patients improved after shunt surgery. Post-traumatic ventriculomegaly was common, but few developed symptomatic PTH and received a VP-shunt. Patients with low-pressure hydrocephalus symptoms had the best shunt response, whereas patients with suspected vegetative state exhibited a minimal shunt response.