Sudden change is usually medical, not decline

A sudden shift in confusion, alertness, behavior, or a new fall over a day or two is rarely the dementia itself getting worse. It is most often something acute and treatable. An infection, dehydration, a new medication, constipation, untreated pain, or a small stroke. Doctors call this delirium and treat it as an emergency, because the cause can be serious. The next hour is for finding and fixing the cause, not accepting it as the new normal.

You are the first set of eyes. No nurse is in the room, so the first calls are yours.

Call for an evaluation today

Call the primary care doctor or a nurse line and say it came on suddenly. Ask to be seen today, or for a urine test and basic labs to be ordered. Infection, often a urinary or chest infection, along with dehydration and a new or changed medicine, are the most common reversible causes, so have the full medicine list ready, including anything over the counter. One caution. A positive urine test alone, with no other symptoms, is not always the answer, so ask them to look at the whole picture rather than treat a urine result on its own.

Signs that mean call 911 now, not wait

Call 911, and do not drive them yourself, for any of these. Sudden face droop, arm weakness, or slurred speech. A blow to the head while they take a blood thinner such as warfarin, Eliquis, Xarelto, or daily aspirin, even if they seem fine, because the bleeding can be slow. A fall where they cannot bear weight, or one leg looks shorter or turned outward. A high or very low temperature, fast breathing, or being very hard to wake. Chest pain, trouble breathing, a seizure, or they cannot be roused.

While you arrange care, do what a good hospital would

These steps calm delirium and you can start them now. Put their glasses and hearing aids on. Keep the room bright and active by day, dark and quiet at night. Offer fluids. Stay close, say who you are, keep sentences short, and do not argue with them or quiz them. Do not give a sedative or a sleep aid, and do not restrain them. Both usually make delirium worse.

Do not accept it as the new baseline

A common pattern is a family taking a sudden drop as decline, then weeks later the infection is caught and the person comes most of the way back. Hold off on any placement decision until acute medical causes have been ruled out.

After the immediate hour

Once the crisis is delayed or stabilized, you have time. Take the standard quiz to get curated picks for the longer arc. COPES eligibility, your AAA, family caregiver support, what to set up before the next round.

These scripts are paraphrased from caregivers who have been through these situations on r/dementia, r/AgingParents, ALZConnected, and AARP. They are not legal or medical advice. The LTC Ombudsman, your AAA, and the Alzheimer's helpline are all free and can advise on the specifics of your situation.

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