Post-traumatic hydrocephalus after ventricular shunt placement in a Singaporean neurosurgical unit.

Ventricular enlargement is a common finding after severe head injury and has a poor prognosis if associated with post-traumatic hydrocephalus (PTH). We retrospectively reviewed our head injury database and identified patients who suffered from severe head injury and subsequently had shunt insertion after a diagnosis of PTH. A total of 871 patients with severe head injury were admitted from April 1999 to December 2006. Twenty-three patients (2.6%) were diagnosed with post-traumatic hydrocephalus and had a shunt inserted. Multiple logistic regression analysis showed that age, and unilateral and bilateral decompressive craniectomy, were significant predictors of PTH. The timing of shunt placement was between 2 weeks and 5 months post-head injury with a mean interval of 70 days. Three patients developed complications after shunt insertion. Seventeen patients (74%) achieved improvement after shunt insertion while the remainder had no significant change in neurological status. Eleven patients (48%) had improvements in their Glasgow Coma Scale (GCS) score of ≥2 points, while six patients (26%) had a single-point improvement in their GCS score. At 1 year after shunting, 35% of patients had Glasgow Outcome Scale scores of 3 to 4. PTH is a condition that has an insidious onset with varying clinical and radiological presentations. The incidence is low but there is a significant benefit from ventricular shunt insertion. The use of cerebrospinal fluid dynamic studies, in addition to clinical and radiological findings, has the potential for better diagnosis and management of these patients.