Symptomatic ARIA in 5+ years of use: 1 case
Despite years of liberal monoclonal antibody use, Gayatri Devi has seen only one case of symptomatic ARIA; all other cases were detected only on MRI.
Snapshot · The Peter Attia Drive
#399 ‒ The evolution of Alzheimer's disease and dementia care: how early detection, personalized treatment, new therapies, and a multimodal approach are changing the landscape | Gayatri Devi, M.D.
Explore episode
Jul 13, 2026
Where this was said
ARIA mechanisms and monitoring strategies
At 1:06:06 · chapter starts 1:03:30
The mechanism of ARIA becomes clinically concrete in this segment: anti-amyloid antibodies clear amyloid not just from brain parenchyma but also from the tunica media (walls) of small brain arteries. This removal disrupts vascular continuity, causing first fluid leakage (ARIA-E, edema) and then extravasation of actual blood (ARIA-H, hemorrhage); in severe cases with concurrent blood thinners, the result can be fatal [1] — Gayatri Devi "Anti-amyloid antibodies clear amyloid not just from brain substrate but also from the walls of small brain arteries. This disrupts vascular…" 1:03:30 . Gayatri Devi's response is systematic: all patients undergo regular MRI monitoring, and in over five years of practice she has only encountered one case of symptomatic ARIA — all other cases were detected on imaging alone. For patients with persistent ARIA-E, she preemedicates with steroids before each subsequent infusion, borrowing from the treatment approach for spontaneous cerebral amyloid angiopathy-related inflammation. One dramatic case — a APOE4 homozygous man who developed significant ARIA-E and microhemorrhages at month 18 without any symptoms — illustrates both the risk and the importance of radiographic surveillance.
How ARIA Actually Happens in the Brain
Anti-amyloid antibodies clear amyloid not just from brain substrate but also from the walls of small brain arteries. This disrupts vascular integrity, causing fluid leakage (ARIA-E, edema) and then actual blood extravasation (ARIA-H, hemorrhage). In severe cases with blood thinners or large vessel disruption, it can be fatal.
Two Cases of Exceptional Alzheimer's Treatment Response
One patient cleared her brain amyloid and then subsequently showed no tau on a tau PET scan — a response Gayatri Devi describes as so remarkable she 'refuses to believe' the pathology is gone. Another patient, an identical twin of a facility-dwelling Alzheimer's patient, did so well on monoclonal therapy despite having a mechanical heart valve and being on Coumadin.
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