Vascular Cognitive Decline
The one everyone can prevent
Vascular cognitive impairment — cognitive decline from blocked, leaky, or damaged blood vessels in the brain — is the second most common dementia cause after Alzheimer's. It's also the MOST preventable. If you want to protect your brain, start with your blood vessels.
Blood pressure is the giant lever
The SPRINT-MIND trial randomised 9,361 adults to intensive (<120/80) vs standard (<140/90) BP targets. Intensive control reduced MCI + dementia by ~19% over 3 years. This is the best RCT evidence we have that aggressive BP treatment protects the brain — and it was stopped early for cardiovascular mortality benefit on top.
White matter lesions — silent harbingers
MRI frequently shows 'white matter hyperintensities' — small punctate lesions from chronic microvascular damage. In untreated hypertensives they accumulate by late 50s. They predict future dementia and stroke. Most radiology reports mention them almost in passing; most patients never hear about them.
Rank for vascular brain protection
Order from highest to lowest effect on vascular dementia prevention.
Sleep apnoea — the silent vascular driver
Untreated obstructive sleep apnoea (AHI ≥15) doubles the risk of vascular dementia and accelerates cognitive decline 2-3 years per decade. Mechanism: repeated overnight oxygen desaturation damages cerebral microvasculature; sympathetic-tone surges spike BP. The CPAP test is straightforward — a home sleep study runs ~$200-400 and is one of the highest-yield tests in middle age. If you snore loudly, wake unrefreshed, or your partner notices breathing pauses, get tested.
Key Takeaway
Vascular brain health IS cardiovascular health. Everything from NT2 Cardiovascular applies here — ApoB, BP, smoking, sleep apnoea. The preventive-cardiology playbook is also the dementia-prevention playbook. Work both at once; you can't beat the efficiency.