TY - JOUR
T1 - Association of blood pressure elevation and nocturnal dipping with brain atrophy, perfusion and functional measures in stroke and nonstroke individuals
AU - Hajjar, Ihab
AU - Zhao, Peng
AU - Alsop, David
AU - Abduljalil, Amir
AU - Selim, Magdy
AU - Novak, Peter
AU - Novak, Vera
N1 - Funding Information:
acknowledgments:We acknowledge contributions of Sarah LaRose, Laura DesRochers, Rob Marquise, Fontini Kourtelidis, and Susan LaRuche from Beth Israel Deaconess Medical Center for their help with data acquisition. This analysis was supported by an NIa grant (K23aG30057) to I.H.This study was supported by NIH-NINDS R01-NS045745, NIH-NINDS STTR 1R41NS053128-01a2, aDa1-06-CR-25 and UL1 RR025758, and M01-RR-01032 grants to V.N.
PY - 2010/1
Y1 - 2010/1
N2 - Background Although both blood pressure elevation and lower nocturnal dipping increase vascular risk, it is not known whether either or both are also associated with brain atrophy, cerebral perfusion, and functional status.MethodsWe investigated the association of elevated blood pressure and nocturnal dipping based on 24-h ambulatory recordings with brain atrophy and perfusion and functional status in 80 older adults with and without stroke (age 66.4 ± 0.8 years, 51% women, 16% nonwhite, 46% prior ischemic stroke, 55% hypertension). Anatomical and three-dimensional continuous arterial spin labeling (CASL) brain magnetic resonance imaging (MRI) measuring volumes and perfusion and 24-h ambulatory blood pressure readings were completed. Results Nocturnal dipping of lesser magnitude in systolic (nonstroke: P = 0.03; stroke: P = 0.005) and pulse pressure (PP; nonstroke: P = 0.002; stroke: P = 0.01) was associated with greater brain atrophy, affecting preferentially the fronto-parietal regions. Dipping of lesser magnitude in systolic blood pressure (SBP; nonstroke: P = 0.01; stroke: P = 0.03) and greater brain atrophy (nonstroke: P = 0.04; stroke: P = 0.05) were also associated with slower gait speed and worse functional outcome after stroke. Higher 24-h blood pressure averages were associated with lower cerebral perfusion but not atrophy in those with and without stroke. Conclusions In those with and without stroke, dipping of lesser magnitude in systolic and PP is associated with brain atrophy and worse functional status. Nocturnal dipping, in addition to elevated blood pressure, should be considered as an additional important target in the clinical evaluation of those at risk for cerebrovascular disease or functional loss.
AB - Background Although both blood pressure elevation and lower nocturnal dipping increase vascular risk, it is not known whether either or both are also associated with brain atrophy, cerebral perfusion, and functional status.MethodsWe investigated the association of elevated blood pressure and nocturnal dipping based on 24-h ambulatory recordings with brain atrophy and perfusion and functional status in 80 older adults with and without stroke (age 66.4 ± 0.8 years, 51% women, 16% nonwhite, 46% prior ischemic stroke, 55% hypertension). Anatomical and three-dimensional continuous arterial spin labeling (CASL) brain magnetic resonance imaging (MRI) measuring volumes and perfusion and 24-h ambulatory blood pressure readings were completed. Results Nocturnal dipping of lesser magnitude in systolic (nonstroke: P = 0.03; stroke: P = 0.005) and pulse pressure (PP; nonstroke: P = 0.002; stroke: P = 0.01) was associated with greater brain atrophy, affecting preferentially the fronto-parietal regions. Dipping of lesser magnitude in systolic blood pressure (SBP; nonstroke: P = 0.01; stroke: P = 0.03) and greater brain atrophy (nonstroke: P = 0.04; stroke: P = 0.05) were also associated with slower gait speed and worse functional outcome after stroke. Higher 24-h blood pressure averages were associated with lower cerebral perfusion but not atrophy in those with and without stroke. Conclusions In those with and without stroke, dipping of lesser magnitude in systolic and PP is associated with brain atrophy and worse functional status. Nocturnal dipping, in addition to elevated blood pressure, should be considered as an additional important target in the clinical evaluation of those at risk for cerebrovascular disease or functional loss.
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U2 - 10.1038/ajh.2009.187
DO - 10.1038/ajh.2009.187
M3 - Article
C2 - 19798036
AN - SCOPUS:72449203094
SN - 0895-7061
VL - 23
SP - 17
EP - 23
JO - American Journal of Hypertension
JF - American Journal of Hypertension
IS - 1
ER -