Vascular Dementia: From Pathophysiology to Therapeutic Frontiers.

Abstract

Vascular dementia (VaD) represents the second-most common dementia type after Alzheimer's disease since it results from complications of cerebrovascular disease. Mixed pathologies combining vascular and neurodegenerative processes are the rule rather than exception in elderly dementia patients. The condition known as VaD includes various types of vascular damage that affect both large and small blood vessels in the brain which results in cerebral hypoperfusion, blood-brain barrier disruption, glymphatic dysfunction, and molecular cascades causing neuronal damage. The mechanisms of VaD include endothelial dysfunction, oxidative stress, chronic neuroinflammation, impaired glymphatic clearance, white matter demyelination, and synaptic failure. The disease susceptibility of individuals depends on genetic factors which include NOTCH3 mutations and vascular risk polymorphisms. The diagnostic field uses neuroimaging tools and fluid biomarkers such as neurofilament light chain, inflammatory markers, and Aβ/tau ratios for mixed pathology. The current practice of vascular risk management combines with new therapeutic approaches that use phosphodiesterase inhibitors for cerebral perfusion and NLRP3 inflammasome inhibitors for neuroinflammation, senolytics for cellular senescence, and remyelination agents for white matter repair. However, the majority of new treatment methods remain investigational with limited Phase III data. Future medical treatment development will depend on precision medicine approaches which use biomarker-guided treatment selection and combination strategies targeting multiple pathological mechanisms.