Cerebral hemodynamics and incident depression: the Rotterdam Study

Area of Science:

• Neuroscience
• Gerontology
• Cardiovascular Research

Background:

• The vascular depression hypothesis posits that cerebrovascular disease contributes to depression in older adults.
• While structural brain changes have been studied, hemodynamic alterations remain less explored.

Purpose of the Study:

• To investigate the association between cerebral blood flow and vasomotor reactivity with incident depressive symptoms and disorders in healthy older adults.
• To provide prospective evidence for the vascular depression hypothesis.

Main Methods:

• A cohort of 1494 participants (65+ years) without depression, dementia, or stroke at baseline from the Rotterdam Study.
• Cerebral blood flow velocities (middle cerebral artery) and vasomotor reactivity were measured using transcranial Doppler ultrasonography.
• Depressive symptoms were assessed using the Centre for Epidemiological Studies-Depression (CES-D) scale, with diagnoses confirmed via interview; analyses adjusted for covariates.

Main Results:

• Lower baseline blood flow velocities were associated with higher CES-D scores and predicted incident depressive symptoms and disorders.
• Reduced mean blood flow velocity predicted both depressive symptoms and disorders.
• Decreased baseline vasomotor reactivity predicted incident depressive disorders, suggesting a link to cerebral microangiopathy.

Conclusions:

• Reduced cerebral blood flow velocity is a predictor of depressive symptoms and disorders in older adults, supporting the vascular depression hypothesis.
• Impaired vasomotor reactivity predicts depressive disorders, potentially indicating underlying cerebral microangiopathy.
• These prospective findings underscore the importance of vascular health in maintaining mental well-being in aging individuals.