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Daily bibliographic review of the Neurosurgery Department. La Fe University Hospital. Valencia, Spain

Extended Long-Term (>5 Years) Outcome of Cerebrospinal Fluid Shunting in Idiopathic Normal Pressure Hydrocephalus

Neurosurgery 67:295-301, 2010 DOI: 10.1227/01.NEU.0000371972.74630.EC

Shunt surgery has been established as the only durable and effective treatment for idiopathic normal pressure hydrocephalus.

OBJECTIVE:We evaluated the “extended” long-term follow-up (> 5 years) in a prospective study cohort who underwent shunting between 1990 and 1995. A secondary objective was to determine the cause of death in these patients.

METHODS: Fifty-one patients were included after confirmation of the diagnosis by extensive clinical and diagnostic investigations. Surgery included ventriculoatrial or ventriculoperitoneal shunting with differential pressure valves in the majority of patients. For each of the cardinal symptoms, postoperative outcome was assessed separately with the Krauss Improvement Index, yielding a value between 0 (no benefit) and 1 (optimal benefit) for the overall outcome.

RESULTS: Mean age at surgery was 70.2 years (range, 50-87 years). Thirty patients were women, and 21 were men. Short-term (18.8 ± 16.6 months) follow-up was available for 50 patients. The Krauss Improvement Index was 0.66 ± 0.28. Long-term (80.9 ± 51.6 months) follow-up was available for 34 patients. The Krauss Improvement Index was 0.64 ±0.33. Twenty-nine patients died during the long-term follow-up at a mean age of 75.8 years (range, 55-95 years). The major causes of death were cardiovascular disorders: cardiac failure (n = 7) and cerebral ischemia (n = 12). Other causes were pneumonia (n = 2), acute respiratory distress syndrome (n = 1), pulmonary embolism (n = 1), cancer (n = 2), renal failure (n = 1), and unknown (n = 3). There was no shunt-related mortality.

CONCLUSION: Idiopathic normal pressure hydrocephalus patients may benefit from shunting over the long term when rigorous selection criteria are applied. Shunt-related mortality is negligible. The main cause of death is vascular comorbidity.

Category: hydrocephalus, Outcome

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