[Idiopathic normal pressure hydrocephalus in the aged]

Area of Science:

• Neurology
• Neurosurgery
• Medical Diagnostics

Context:

• Idiopathic normal pressure hydrocephalus (iNPH) is a neurological condition affecting the elderly.
• Accurate diagnosis is crucial for effective treatment, often involving cerebrospinal fluid (CSF) shunting.
• Distinguishing iNPH subtypes can optimize patient selection for surgery.

Purpose:

• To evaluate the utility of continuous lumbar cerebrospinal fluid pressure measurement in diagnosing iNPH in aged patients.
• To differentiate between high-pressure and normal-pressure groups within suspected iNPH cases.
• To assess the correlation between pressure profiles and clinical outcomes, including response to CSF removal and shunt surgery.

Summary:

• Nineteen elderly patients with suspected iNPH underwent continuous lumbar CSF pressure monitoring, dividing them into high-pressure (H group, n=11) and normal-pressure (N group, n=8) cohorts.
• The H group exhibited significantly higher baseline CSF pressure (16.3 ± 3.0 mmHg) compared to the N group (9.6 ± 1.7 mmHg), with elevated pulse pressure and wave frequency.
• Clinical symptoms and CT findings were similar between groups, but the H group showed consistent improvement after CSF removal. Shunt surgery was effective in 72.7% of H group patients.

Impact:

• Continuous lumbar CSF pressure monitoring provides a valuable diagnostic tool for selecting elderly patients with iNPH.
• This technique aids in identifying patients likely to benefit from surgical intervention, such as shunt placement.
• The findings support the use of invasive pressure monitoring to refine iNPH diagnosis and treatment strategies.