Blood Biomarkers for Alzheimer Disease and Neuro-injury to Estimate the Association With Cognitive/Functional Decline and Mortality in a Real-world Population of GERiatric Hospitalized Patients (BAD-GER)

This study measures blood biomarkers related to Alzheimer's disease and brain injury in elderly hospitalised patients — whether they are in hospital for neurological conditions (like stroke or delirium) or non-neurological conditions with or without dementia — to see how these markers predict decline over time. **You may be eligible if...** - You are an older adult admitted to hospital for a stroke, delirium, epileptic seizure, or brain infection, OR - You are admitted for a non-neurological illness and have dementia, OR - You are admitted for a non-neurological illness without dementia - You or your representative can provide informed consent **You may NOT be eligible if...** - You are unwilling or unable to provide consent - Your condition does not fit one of the three groups above Talk to your doctor to see if this trial is right for you.