RT Journal Article
SR Electronic
T1 An Investigation of Water Diffusivity Changes along the Perivascular Space in Elderly Subjects with Hypertension
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 48
OP 55
DO 10.3174/ajnr.A7334
VO 43
IS 1
A1 J. Kikuta
A1 K. Kamagata
A1 K. Takabayashi
A1 T. Taoka
A1 H. Yokota
A1 C. Andica
A1 A. Wada
A1 Y. Someya
A1 Y. Tamura
A1 R. Kawamori
A1 H. Watada
A1 S. Naganawa
A1 S. Aoki
YR 2022
UL http://www.ajnr.org/content/43/1/48.abstract
AB BACKGROUND AND PURPOSE: Hypertension may be related to alterations of the glymphatic system, a waste metabolite drainage system in the brain. We aimed to investigate analysis along the perivascular space index changes in elderly subjects with hypertension.MATERIALS AND METHODS: Diffusion-weighted images were acquired from 126 subjects, including 63 subjects with hypertension (25 men and 38 women; mean age, 72.45 years) and 63 age- and sex-matched controls (25 men and 38 women; mean age, 72.16 years). We calculated the analysis along the perivascular space index as a ratio of the mean of x-axis diffusivities in the projection and association areas to the mean of y-axis diffusivity in the projection area and z-axis diffusivity in the association area. The left, right, and mean analysis along the perivascular space indices of both hemispheres were compared between the hypertension and control groups using a Mann-Whitney U test. The Spearman correlation coefficient was used to assess the correlation between the left, right, and mean ALPS indices and blood pressure and pulse pressure.RESULTS: The left (P = .011) and mean (P = .024) analysis along the perivascular space indices of the hypertension group were significantly lower than that of the control group. The left, right, and mean analysis along the perivascular space indices of all subjects were significantly negatively correlated with blood pressure values (r = −0.200 to −0.278, P = .002–0.046) and pulse pressure values (r = −0.221 to −0.245, P = .006–0.013).CONCLUSIONS: Our results are consistent with a model in which hypertension causes glymphatic dysfunction.ALPSanalysis along the perivascular spaceHThypertensionISFinterstitial fluid