Proton Magnetic Resonance Spectroscopy Reveals Similar White Matter Biochemical Changes in Patients with Chronic Hypertension and Early Alzheimer's Disease
Article first published online: 17 OCT 2002
Journal of the American Geriatrics Society
Volume 50, Issue 10, pages 1707–1710, October 2002
How to Cite
Catani, M., Mecocci, P., Tarducci, R., Howard, R., Pelliccioli, G. P., Mariani, E., Metastasio, A., Benedetti, C., Senin, U. and Cherubini, A. (2002), Proton Magnetic Resonance Spectroscopy Reveals Similar White Matter Biochemical Changes in Patients with Chronic Hypertension and Early Alzheimer's Disease. Journal of the American Geriatrics Society, 50: 1707–1710. doi: 10.1046/j.1532-5415.2002.50465.x
- Issue published online: 17 OCT 2002
- Article first published online: 17 OCT 2002
- Alzheimer's disease;
- proton magnetic resonance spectroscopy
OBJECTIVES: Hypertension is a risk factor for dementia and is associated with some of the brain changes that are found in Alzheimer's disease and other neurodegenerative diseases, such as atrophy and neurofibrillary tangles. We evaluated the cerebral white matter biochemical pattern in healthy older subjects, older patients with chronic hypertension, and patients with Alzheimer's disease (AD) using proton magnetic resonance spectroscopy (1H-MRS).
DESIGN: Cross-sectional study.
SETTING: University-affiliated outpatient clinic.
PARTICIPANTS: Ten healthy older subjects, 10 cognitively intact older patients with chronic hypertension, and 10 older patients with early AD.
MEASUREMENTS: All subjects underwent clinical examination, neuropsychological assessment, and 1H-MRS to measure N-acetylaspartate (NAA), myoinositol, choline, and creatine resonance signals in an 8-cm3 voxel located in the paratrigonal white matter region bilaterally. NAA/creatine, myoinositol/creatine, and choline/creatine ratios were measured, and the mean values were compared using one-way analysis of variance with Tukey test for post hoc analysis.
RESULTS: A significantly higher mean myoinositol/creatine (ratio ± standard deviation) was found in hypertensive patients (0.67 ± 0.05) and in AD patients (0.68 ± 0.08) than in controls (0.56 ± 0.04) (P < .001). Conversely neither NAA/creatine ratio nor choline/creatine ratio differed among the three groups.
CONCLUSIONS: In this study, cognitively intact chronic hypertensive older patients had a higher white matter myoinositol/creatine ratio compared with healthy older subjects, suggesting that myoinositol may be a sensitive marker of the effects of chronic hypertension on the brain. Moreover, the similar increase of myoinositol/creatine ratio in patients with hypertension and in those with early AD provides further evidence of common brain changes with these conditions.