Life-course blood pressure in relation to brain volumes

Abstract

Introduction: The impact of blood pressure on brain volumes may be time-dependent or pattern-dependent.

Methods: Of 1678 participants from the Atherosclerosis Risk in Communities Neurocognitive Study, we quantified the association between measures and patterns of blood pressure over three time points (∼24 or ∼15 years prior and concurrent with neuroimaging) with late life brain volumes.

Results: Higher diastolic blood pressure ∼24 years prior, higher systolic and pulse pressure ∼15 years prior, and consistently elevated or rising systolic blood pressure from ∼15 years prior to concurrent with neuroimaging, but not blood pressures measured concurrent with neuroimaging, were associated with smaller volumes. The pattern of hypertension ∼15 years prior and hypotension concurrent with neuroimaging was associated with smaller volumes in regions preferentially affected by Alzheimer's disease (e.g., hippocampus: -0.27 standard units, 95% CI: -0.51, -0.03).

Discussion: Hypertension 15 to 24 years prior is relevant to current brain volumes. Hypertension followed by hypotension appears particularly detrimental.

Keywords: Alzheimer's disease; Blood pressure; Brain volumes; Cohort study; Epidemiology; Human; Hypertension; Hypotension; Magnetic resonance imaging; Neurodegeneration.