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Cerebral blood flow in normal pressure hydrocephalus
H L Mamo1, P C Meric, J C Ponsin
1Département d'Explorations Fonctionnelles du Système Nerveux, Hôpital Lariboisière, Paris, France.
Stroke
|November 1, 1987
Summary
Cerebral blood flow (CBF) increased after cerebrospinal fluid (CSF) removal in normal pressure hydrocephalus (NPH) patients, indicating shunting is beneficial. Most dementia patients showed no CBF change, suggesting NPH is distinct.
Area of Science:
- Neurology
- Neurosurgery
- Radiology
Background:
- Normal pressure hydrocephalus (NPH) is characterized by cognitive decline, gait disturbance, and urinary incontinence.
- The role of cerebrospinal fluid (CSF) dynamics and cerebral blood flow (CBF) in NPH pathophysiology remains incompletely understood.
- Altered intracranial pressure dynamics are suspected in NPH, potentially affecting cerebral perfusion.
Purpose of the Study:
- To investigate the relationship between CSF removal and CBF in NPH patients.
- To evaluate CBF changes as a predictor for shunt surgery outcomes in NPH.
- To differentiate CBF patterns in NPH from those observed in senile and presenile dementia.
Main Methods:
- Utilized a xenon-133 inhalation method to quantify CBF.
- Measured CBF before and after CSF removal via lumbar puncture.
- Correlated CBF changes with clinical outcomes following CSF removal and subsequent shunt placement.
Main Results:
- A significant increase in CBF was observed in NPH patients after CSF removal.
- 88% of NPH patients who underwent shunt surgery showed favorable clinical outcomes, correlating with increased CBF.
- The majority of patients with senile and presenile dementia exhibited a decrease or no change in CBF after CSF removal.
Conclusions:
- Increased CBF following CSF removal is a strong indicator for successful shunt surgery in NPH.
- CBF response to CSF removal can help differentiate NPH from other dementias.
- While intraparenchymal pressure may influence both CBF and symptoms, a direct linear relationship is not evident in NPH; impaired autoregulation is a key factor.