A patient trying to leave the unit, heading somewhere that made sense decades ago. What's actually driving it, and what to do in the first minute after they're noticed missing.
Notice the alarm doing the thinking for you. A bed or door alarm tells you someone is moving. It doesn't tell you where they think they're going, and that's the more useful question.
Most exit-seeking is purposeful, not random. It attaches to something specific: getting to work, picking up a child now decades older than that, getting home to an address that isn't theirs anymore. If this is new, with no history of it, treat it the same as any other sudden change and rule out pain, a full bladder, or an unmet need before assuming it's simply the dementia.
Search and security protocols are set by your hospital, and this page doesn't replace them. What's worth carrying into that call: every minute before the search starts is a minute the search has to cover later.
She isn't lost, not to herself. She's on her way somewhere, and the fastest way to reach her is to go there with her for a minute before you turn her around.