Erfan Bashar
Back to Delirium

Delirium — Prognosis

~1 min read
Last medically reviewed:
On this pageTable of contents

Educational scope notice: This is a study note for medical students, not medical advice, diagnosis, or treatment guidance. Clinical management should follow local protocols and current guidelines.

Many episodes resolve promptly once the cause is treated, but persistence for weeks to months is common. Roughly a third of older hospital patients are still delirious at discharge, and about 1 in 6 remains so a year later. Delirium must therefore be framed as potentially chronic, with follow-up arranged across settings rather than assumed over.

Longer episodes track with lasting cognitive impairment. Across surgical and nonsurgical groups alike, delirium is followed by measurably worse long-term cognition, consistent with a causative contribution. Patients who survive critical-illness delirium carry the same burden: longer hospital stays and long-term cognitive impairment in survivors.

Survival itself is worse. Delirium carries increased risk of dementia and death, longer stays, and new admission to long-term care, and delirious intensive-care patients show lower survival at six months than those without delirium. Patients sent home with unresolved delirium face substantially higher subsequent mortality, though no single figure pins that risk.

Resolution matters more than any single intervention, which is why delirium should never be left unaddressed at discharge. Delirium that does not resolve calls for re-evaluation for underlying causes, and every patient who experienced delirium needs follow-up for possible dementia.

Evidence anchors

Suggest a correction