Question 1

What is delirium?

Accepted Answer

Delirium is a sudden, severe change in mental status with poor attention, confusion, and fluctuating awareness. It develops over hours to days due to a medical cause (infection, medication, withdrawal, surgery, metabolic problem) and is a medical emergency. Unlike dementia, delirium is typically reversible when the underlying cause is treated.

Question 2

What causes delirium?

Accepted Answer

Common causes include infections (especially urinary tract and pneumonia), medications (opioids, anticholinergics, benzodiazepines, sedatives), substance withdrawal (alcohol, benzodiazepines), surgery/anesthesia, metabolic problems (low sodium, kidney/liver failure, low oxygen), dehydration, and severe illness. Often multiple factors contribute.

Question 3

Delirium vs dementia: what's the difference?

Accepted Answer

Delirium develops suddenly (hours to days), fluctuates throughout the day, severely impairs attention, has a clear medical trigger, and is usually reversible. Dementia develops gradually (months to years), is relatively stable day-to-day, preserves attention early on, progresses slowly, and is generally not reversible. People with dementia are at higher risk for delirium.

Question 4

Delirium vs psychosis: how do they differ?

Accepted Answer

Both can involve hallucinations and agitation, but delirium includes global inattention (can't focus or follow conversation), disorientation, acute onset with medical cause, and fluctuating consciousness. Psychosis typically has intact attention and orientation, hallucinations/delusions without the fluctuating confusion, and lacks the acute medical trigger.

Question 5

Can delirium be reversed?

Accepted Answer

Yes, delirium is often reversible when the underlying cause is identified and treated promptly. However, some people, especially those with preexisting cognitive impairment or severe illness, may have prolonged delirium or incomplete recovery. Early recognition and treatment improve outcomes.

Question 6

How long does delirium last?

Accepted Answer

Duration varies widely. Some cases resolve in days once the cause is treated; others persist for weeks, especially in ICU settings or when multiple factors are involved. Hypoactive (quiet) delirium and delirium in people with dementia tend to last longer. Rarely, cognitive changes persist beyond the acute episode.

Question 7

What are the types of delirium?

Accepted Answer

Hyperactive delirium: agitation, restlessness, combativeness (most recognized). Hypoactive delirium: lethargy, withdrawn, quietly confused (often missed). Mixed delirium: alternates between hyperactive and hypoactive states. All types require the same urgency in evaluation and treatment.

Question 8

Why is delirium often missed in hospitals?

Accepted Answer

Hypoactive delirium is easily overlooked because patients are quiet and cooperative. Families and staff may assume the person is 'just tired' or attribute confusion to dementia without recognizing an acute change. Fluctuation means patients may seem better at certain times, leading to delayed diagnosis.

Question 9

What is the CAM (Confusion Assessment Method)?

Accepted Answer

The CAM is a validated screening tool for delirium requiring: (1) acute onset and fluctuating course, (2) inattention, and (3) either disorganized thinking or altered level of consciousness. It helps clinicians quickly identify delirium at the bedside.

Question 10

Who is at highest risk for delirium?

Accepted Answer

Older adults (especially over 65), people with dementia or cognitive impairment, those with multiple medical problems, frailty, vision/hearing loss, history of delirium, severe illness, surgery/ICU stays, and polypharmacy (especially sedatives, opioids, anticholinergics). Dehydration, malnutrition, and sleep deprivation increase risk.

Question 11

Can medications cause delirium?

Accepted Answer

Yes. Common culprits include opioids, benzodiazepines, anticholinergics (including many over-the-counter sleep aids and allergy medications), sedatives, steroids, certain antibiotics, and muscle relaxants. Starting, stopping, or combining these increases risk, especially in older adults.

Question 12

What is ICU delirium?

Accepted Answer

Delirium that occurs in the intensive care unit, affecting up to 80% of ICU patients. Causes include severe illness, sedatives, mechanical ventilation, sleep deprivation, immobility, pain, and lack of day-night cues. ICU delirium is associated with worse outcomes, prolonged hospitalization, and lasting cognitive impairment.

Question 13

What is sundowning, and is it the same as delirium?

Accepted Answer

Sundowning refers to increased confusion and agitation in late afternoon/evening, common in dementia. It's not the same as delirium, but delirium often worsens at night (because of circadian rhythm disruption and fewer environmental cues). If confusion appears suddenly and fluctuates, suspect delirium, not just sundowning.

Question 14

How is delirium treated?

Accepted Answer

Treatment focuses on finding and fixing the underlying cause (treating infection, stopping problematic medications, correcting metabolic problems, managing withdrawal). Nonpharmacologic strategies include reorientation, restoring day-night cycles, early mobilization, vision/hearing aids, hydration, and family presence. Antipsychotics are reserved for severe agitation or safety concerns.

Question 15

Should antipsychotics be used for delirium?

Accepted Answer

Antipsychotics don't shorten delirium duration but may be used cautiously at low doses when patients are severely distressed, dangerous to themselves/others, or to allow necessary medical care. They carry risks (sedation, falls, QTc prolongation) and should be stopped as soon as possible. Nonpharmacologic strategies are preferred first-line.

Question 16

What is delirium tremens (DTs)?

Accepted Answer

Delirium tremens is a severe, life-threatening form of alcohol withdrawal delirium, typically occurring 48–96 hours after the last drink. It includes confusion, hallucinations, severe agitation, tremor, rapid heart rate, fever, and seizures. DTs require emergency medical treatment with benzodiazepines and intensive monitoring.

Question 17

Can delirium cause permanent brain damage?

Accepted Answer

While delirium itself is usually reversible, it's associated with acceleration of cognitive decline in people with dementia and increased risk of developing dementia in those without prior impairment. Severe or prolonged delirium, especially in ICU settings, can lead to lasting cognitive deficits in some patients.

Question 18

How can delirium be prevented in the hospital?

Accepted Answer

Prevention strategies include: frequent reorientation, cognitive stimulation, early mobilization, optimizing sleep (quiet at night, activity during day), ensuring patients have glasses/hearing aids, maintaining hydration/nutrition, minimizing unnecessary medications (especially sedatives), preventing/treating pain, and avoiding restraints and catheters when possible.

Question 19

Hyperactive vs hypoactive delirium: what's the difference?

Accepted Answer

Hyperactive delirium involves agitation, restlessness, combativeness, emotional lability, and hyperalertness—easy to recognize. Hypoactive delirium presents as lethargy, withdrawal, slowed speech, and apathy—often mistaken for depression or fatigue. Mixed delirium alternates between both. All require urgent evaluation.

Question 20

What should family members do if they suspect delirium?

Accepted Answer

Seek immediate medical evaluation. Document the timeline (when confusion started), what's different from baseline, any recent illnesses/medications/procedures, and how symptoms fluctuate throughout the day. Bring glasses, hearing aids, and familiar objects. Stay present to provide comfort and reorientation. Ask the medical team to assess for delirium using validated tools like the CAM.

Delirium

Overview

Description

Prevalence

Age of Onset

DSM-5 Code

ICD-10 Code

What This Is

What It Feels Like

Real-Life Stories

Signs & Symptoms

Early Warning Signs

Why It Happens

How It's Told Apart

Delirium vs Other Conditions

Treatment & Next Steps

Seeking Help for Delirium?