Silent Seizures in Dementia
Many seizures in dementia produce no convulsion and no obvious outward sign at all. They surface as a blank stare, a moment of lost time, a sudden unexplained behavior, and they are easily mistaken for the dementia itself. So most are never recognized as seizures, and never reach the record.
The DSS Framework inversion: the events that go most often unseen live in Domain 3 (Awareness Changes) and Domain 4 (Behavioral Changes), the domains most often missed, and most often misattributed to agitation, confusion, or "sundowning."
Each circle is one nursing-home resident. Only a small fraction carry a seizure disorder in their chart. Switch to what extended monitoring actually finds, and the picture changes.
The documented rate is the floor, not the picture. In the published evidence, this hidden burden is linked to faster cognitive decline, more falls, and avoidable harm. Structured surveillance is how the unseen cases get found. The full model below lets you explore it parameter by parameter.
The same mechanism as an adjustable parameter model. Move any slider on the left and the two grids, the catch rates, and the decline figures update live. Every figure carries its source tier.
How many residents live in the facility. More residents means more silent events happening each month.
Share of Alzheimer's residents with subclinical seizure activity on prolonged EEG, drawn from published studies. Higher values mean more undetected events in the population.
Number of residents each staff member oversees during a day shift. Higher ratios reduce the chance that a subtle event will be noticed.
How likely a silent seizure is noticed during routine care. The default of 6% means 94% of subtle events are missed under ordinary observation.
How likely a silent seizure is caught when using a deliberate surveillance protocol. The default of 35% is roughly 6× better than standard observation.
How much faster cognition declines when silent seizures go undetected. At 1.5×, unrecognized seizure activity adds 50% to the expected annual decline rate.
Each grid is 100 silent events. Move any control on the left and watch how many each approach catches.
The clinical gap has a financial shadow, missed events become falls, decline, and liability. When you're ready to put numbers to it for a real facility, that's what a CRISP assessment delivers.