Elevated diastolic blood pressure, but not systolic, was significantly associated with reduced cortical volume (β = -0.18, P = 0.034) and gray matter cerebral blood flow (β = -0.13, P = 0.048).
Cross-Sectional (n=265)
Are diastolic and systolic blood pressures differentially associated with cerebral structural and functional measures in older individuals with and without mild cognitive impairment?
Diastolic blood pressure may be more critically important for gray matter volume and perfusion than systolic blood pressure in older adults, independent of cognitive status.
Estimación del efecto: β = -0.18
valor p: p=0.034
BACKGROUND: Reports on the relative importance of the diastolic and systolic blood pressures (DBP and SBP) in age-related cognitive decline are mixed. Investigating the relation between DBP/SBP and functional and structural brain changes could elucidate which of the 2 measures is more critically important for brain function and, consequently, cognitive impairment. METHODS: We investigated the association of SBP and DBP with cortical volume, cerebral blood flow (CBF), and white matter lesions (WML), in nondemented older adults with and without mild cognitive impairment (MCI; N = 265, 185 MCI, mean age = 64 years). Brachial blood pressure was measured twice while seated, and the average of the 2 measures was used. Cortical volume, gray matter (GM) CBF, and WML were estimated using T1-weighted imaging, arterial spin labeling, and fluid attenuation inversion recovery, respectively. RESULTS: Reduced cortical volume was associated with elevated DBP (β= -0.18, P = 0.034) but not with SBP (β = -0.10, P = 0.206). GM CBF was associated with DBP (β = -0.13, P = 0.048) but not with SBP (β = -0.07, P = 0.275). Likewise, CBF within brain regions where MCI patients showed hypoperfusion were only associated with DBP (DBP: β = -0.17, P = 0.005; SBP: β = -0.09, P = 0.120). WML volume was associated with both DBP (β = 0.20, P = 0.005) and SBP (β = 0.30, P < 0.001). For all measures, there was no interaction between DBP/SBP and cognitive status, indicating that these associations were independent of the cognitive status. CONCLUSIONS: Independently of the cognitive status, DBP is more critically important for GM volume and perfusion, whereas WML is associated with both blood pressures, likely reflecting long-term effect of hypertension and autoregulation dysfunction.
Shokouhi et al. (Sat,) conducted a cross-sectional in Mild cognitive impairment (n=265). Diastolic and systolic blood pressure was evaluated on Cortical volume (β = -0.18, p=0.034). Elevated diastolic blood pressure, but not systolic, was significantly associated with reduced cortical volume (β = -0.18, P = 0.034) and gray matter cerebral blood flow (β = -0.13, P = 0.048).