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Proton chemical shift imaging in normal pressure hydrocephalus
O Kizu1, K Yamada, T Nishimura
1Department of Radiology, Kyoto, Japan.
AJNR. American Journal of Neuroradiology
|October 24, 2001
Summary
Proton chemical shift imaging detects intraventricular lactate, aiding in differentiating normal pressure hydrocephalus (NPH) from other dementias. This metabolite marker may improve shunt surgery candidate selection for NPH patients.
Area of Science:
- Neuroimaging
- Biochemistry
- Neurology
Background:
- Differentiating normal pressure hydrocephalus (NPH) from other dementias is challenging.
- Selecting optimal candidates for NPH shunt surgery requires accurate diagnostic tools.
Purpose of the Study:
- To evaluate the efficacy of proton chemical shift imaging (1H-CSI) in distinguishing NPH from other dementias.
- To correlate cerebral metabolite changes with shunt surgery outcomes in NPH patients.
Main Methods:
- 1H-CSI was performed on NPH patients, patients with other dementias (Alzheimer's, Pick's disease), and controls.
- Volumes of interest within the lateral ventricles were analyzed for metabolite ratios (N-acetylaspartate, creatine, choline, lactate).
- Follow-up imaging and clinical data were assessed post-spinal drainage in two NPH patients.
Main Results:
- Elevated intraventricular lactate levels (lactate/creatine ratio of 0.23 ± 0.14) were detected in all NPH patients, but not in other dementia groups or controls.
- No significant metabolite differences were found in white matter voxels near the lateral ventricles.
- One NPH patient showed decreased intraventricular lactate and improved cerebral blood flow after spinal drainage.
Conclusions:
- Intraventricular lactate levels detected by 1H-CSI show promise as a biomarker for differentiating NPH from other dementias.
- This finding may assist in identifying suitable candidates for NPH shunt surgery.