Normal Pressure Hydrocephalus (NPH) is a treatable cause of dementia, gait disturbance, and urinary incontinence in older adults. Unlike other neurodegenerative conditions, NPH often responds well to surgical intervention, making accurate diagnosis crucial[1].
NPH is characterized by:
| Symptom | Description | Prevalence at Presentation |
|---|---|---|
| Gait disturbance | Magnetic gait, difficulty initiating steps | 90-100% |
| Cognitive impairment | Frontal executive dysfunction, apathy | 80-90% |
| Urinary incontinence | Urgency, frequency, sometimes complete loss | 60-75% |
First-line treatment for clinically suspected NPH[5]:
| Shunt Type | Advantages | Disadvantages |
|---|---|---|
| Programmable valve | Adjustable pressure non-invasively | Requires programming |
| Fixed pressure | Simpler, less expensive | May need revision |
| Anti-siphon device | Reduces overdrainage | Additional hardware |
Outcomes:
| Condition | Key Distinguishing Features |
|---|---|
| Alzheimer disease | Memory loss prominent, no gait improvement post-tap |
| Parkinson disease | Tremor, rigidity, no ventriculomegaly |
| Vascular dementia | Stepwise progression, MRI evidence of strokes |
| Frontotemporal dementia | Behavioral changes, early personality changes |
Relkin N, Marmarou A, Klinge P, Bergsneider M, Black PM. Diagnosing idiopathic normal-pressure hydrocephalus. Neurosurgery. 2005. ↩︎
Kiefer M, Unterberg A. The differential diagnosis and treatment of normal-pressure hydrocephalus. Dtsch Arztebl Int. 2012. ↩︎
Marmarou A, Young HF, Aygok GA. Estimated incidence of normal pressure hydrocephalus and shunt outcome in patients presenting with cognitive impairment. J Neurol Neurosurg Psychiatry. 2005. ↩︎
Ishikawa M, Hashimoto M, Kuwana N, et al. Guidelines for management of idiopathic normal pressure hydrocephalus. Neurol Med Chir (Tokyo). 2008. ↩︎
Mori E, Ishikawa M, Kato T, et al. Guidelines for management of idiopathic normal pressure hydrocephalus (second edition). Neurol Med Chir (Tokyo). 2012. ↩︎