Incidence, diagnostic criteria and outcome following ventriculoperitoneal shunting of idiopathic normal pressure hydrocephalus in a memory clinic population: a prospective observational cross-sectional and cohort study.

Objective: To evaluate diagnostic criteria for idiopathic normal pressure hydrocephalus (INPH) among patients with memory impairment, and to estimate the incidence of INPH.

Design: Prospective observational cross-section and cohort study of diagnostic accuracy.

Setting: Memory Disorders Clinic following referral by the medical practitioners.