One-liner#

Rapid recognition and workup of acute confusion in older adults—a medical emergency that signals underlying illness and requires urgent identification of precipitants (infection, medications, metabolic derangement) while avoiding harmful interventions.

Quick nav#

• Red flags / send to ED
• Key history
• Focused exam
• Differential (quick pattern recognition)
• Workup
• Initial management
• Management by diagnosis
• Follow-up
• Patient instructions
• Smartphrase snippets

Red flags / send to ED#

Most patients with new-onset delirium need ED evaluation. Office-based workup is appropriate only for mild cases with obvious precipitant (e.g., UTI in patient with known baseline).

• Fever with altered mental status → ED (sepsis, meningitis)
• Focal neurologic deficits → ED (stroke, intracranial hemorrhage)
• Head trauma (even minor in elderly) → ED (subdural hematoma)
• Severe agitation or combativeness → ED (safety, need for sedation)
• Hypoxia (SpO2 <92%) → ED
• Hypoglycemia (if not rapidly correctable) → ED
• Suspected overdose or withdrawal → ED
• New seizure → ED
• Unable to identify precipitant → ED for comprehensive workup
• Hemodynamic instability → ED

May manage in office (with close follow-up):

• Mild confusion with clear precipitant (UTI, constipation, medication)
• Stable vitals, no focal deficits
• Reliable caregiver for monitoring
• Able to complete workup same-day

Key history#

CRITICAL: Establish baseline cognition first.

• What is the patient’s usual mental status?
• Do they have known dementia? What stage?
• Can they usually hold a conversation, manage medications, live independently?
• Collateral from family/caregiver is essential

Characterize the change:

• When did the change start? (hours, days)
• Was onset sudden or gradual?
• Is it constant or does it fluctuate? (fluctuation = classic for delirium)
• Worse at night? (sundowning)
• What specifically is different? (confused, agitated, sleepy, not making sense)

Screen for precipitants (I WATCH DEATH mnemonic):

• Infection: Fever, cough, dysuria, skin changes, recent illness
• Withdrawal: Alcohol, benzodiazepines, opioids, barbiturates
• Acute metabolic: Dehydration, electrolyte abnormalities, glucose
• Trauma: Falls, head injury (even minor)
• CNS pathology: Stroke, seizure, hemorrhage
• Hypoxia: Respiratory symptoms, known lung disease
• Deficiencies: B12, thiamine (especially in alcoholics)
• Endocrine: Thyroid, adrenal, glucose
• Acute vascular: MI, PE, stroke
• Toxins/drugs: New medications, medication changes, OTC drugs, supplements
• Heavy metals: Rare but consider in appropriate context

Medication review (HIGH YIELD):

• Recent changes (started, stopped, dose changed in past 2 weeks)
• Anticholinergics: Diphenhydramine, oxybutynin, TCAs, antihistamines, muscle relaxants
• Sedatives: Benzodiazepines, Z-drugs, opioids, gabapentin
• Steroids: Can cause psychiatric symptoms
• Fluoroquinolones: CNS effects, especially in elderly
• NSAIDs: Can cause confusion in elderly
• Polypharmacy: Risk increases with number of medications
• OTC medications: Patients often don’t report these

Review of systems:

• Fever, chills (infection)
• Cough, dyspnea (pneumonia, hypoxia)
• Dysuria, frequency, incontinence (UTI)
• Constipation (common precipitant in elderly)
• Abdominal pain, nausea, vomiting
• Chest pain (MI)
• Headache (meningitis, hemorrhage)
• Recent falls
• Alcohol use (withdrawal risk)
• Sleep deprivation

Focused exam#

Vital signs (critical):

• Temperature (fever → infection; hypothermia in sepsis)
• Heart rate (tachycardia → infection, dehydration, withdrawal)
• Blood pressure (hypotension → sepsis; hypertension → hypertensive encephalopathy)
• Respiratory rate (tachypnea → pneumonia, PE, sepsis)
• Oxygen saturation (hypoxia)
• Glucose (if diabetic or altered)

Mental status (use CAM or 4AT):

Confusion Assessment Method (CAM) - Delirium if 1+2 AND (3 OR 4):

1. Acute onset and fluctuating course
2. Inattention (can’t recite months backward, can’t spell WORLD backward)
3. Disorganized thinking (incoherent, illogical)
4. Altered level of consciousness (hyperalert, lethargic, stuporous)

4AT (quick bedside screen):

• Alertness (0-4 points)
• AMT4 (age, DOB, place, year) (0-2 points)
• Attention (months backward) (0-2 points)
• Acute change or fluctuation (0-4 points)
• Score ≥4 suggests delirium

General:

• Level of arousal (hyperactive, hypoactive, mixed)
  • Hyperactive: Agitated, restless, pulling at lines—easily recognized
  • Hypoactive: Quiet, withdrawn, sleepy—often MISSED, mistaken for depression or fatigue
  • Mixed: Fluctuates between both
• Hydration status (mucous membranes, skin turgor, axillary moisture)
• Signs of trauma (bruising, lacerations)

HEENT:

• Pupils (opioid toxicity = pinpoint; anticholinergic = dilated)
• Nuchal rigidity (meningitis—but may be absent in elderly)
• Oral mucosa (dry = dehydration)

Cardiovascular:

• Heart rhythm (new AF can cause confusion)
• Murmurs (endocarditis)
• JVD, edema (HF exacerbation)

Pulmonary:

• Breath sounds (crackles → pneumonia, HF)
• Work of breathing

Abdomen:

• Distension (constipation, obstruction, urinary retention)
• Tenderness (intra-abdominal infection)
• Bladder distension (urinary retention)

Skin:

• Cellulitis, wounds, pressure ulcers (infection source)
• Rashes
• Diaphoresis (withdrawal, infection)

Neurologic:

• Focal deficits (stroke, mass)
• Tremor (withdrawal, thyroid)
• Asterixis (hepatic encephalopathy, uremia)
• Myoclonus (uremia, medication toxicity)

Rectal (if indicated):

• Fecal impaction (common precipitant)

Differential (quick pattern recognition)#

Common/likely (outpatient)#

Can’t-miss / urgent#

Workup#

Office workup (if appropriate for office management):

Additional tests based on clinical suspicion:

When to send to ED for workup:

• Unable to identify precipitant
• Abnormal vital signs (fever, hypotension, hypoxia, tachycardia)
• Focal neurologic deficits
• Severe agitation
• Need for IV fluids, IV antibiotics, or imaging not available same-day
• Unreliable home situation for monitoring

Caution: UTI in elderly

• Asymptomatic bacteriuria is common and should NOT be treated
• UTI as cause of delirium requires: positive UA AND no other explanation AND clinical improvement with treatment
• Don’t reflexively blame the urine

Initial management#

Priorities:

1. Identify and treat underlying cause
2. Ensure safety (patient and others)
3. Avoid medications that worsen delirium
4. Supportive care

Non-pharmacologic management (FIRST LINE):

• Reorientation (clock, calendar, familiar objects, family photos)
• Consistent caregivers
• Adequate lighting (bright during day, dim at night)
• Minimize noise
• Promote sleep-wake cycle (no daytime sleeping, quiet at night)
• Mobilize if safe (avoid restraints)
• Ensure glasses and hearing aids are in place
• Avoid urinary catheters if possible
• Treat pain adequately
• Maintain hydration and nutrition
• Avoid constipation

Medications to STOP or REDUCE:

• Anticholinergics (diphenhydramine, oxybutynin, TCAs)
• Benzodiazepines (unless treating withdrawal)
• Opioids (reduce if possible; undertreated pain also causes delirium)
• Sedative-hypnotics
• Steroids (if possible)
• Fluoroquinolones (switch to alternative antibiotic)

When pharmacologic management is needed:

• Reserve for severe agitation threatening safety
• Use lowest effective dose for shortest time
• Antipsychotics do NOT shorten delirium duration but may reduce distress

Management by diagnosis#

UTI-precipitated delirium#

Education:

• Bladder infections can cause confusion in older adults
• Antibiotics should help within 24-48 hours
• Confusion may take several days to fully resolve

Treatment:

Caution: Don’t treat asymptomatic bacteriuria. Positive UA alone doesn’t mean UTI is causing delirium.

Follow-up: 24-48 hours to ensure improvement; if no improvement, reconsider diagnosis.

Medication-induced delirium#

Education:

• Many medications can cause confusion, especially in older adults
• Stopping or reducing the medication usually resolves the confusion
• It may take several days for confusion to clear

Management:

• Stop offending medication if possible
• If medication is necessary, reduce dose or switch to alternative
• Provide supportive care while waiting for clearance

Common culprits and alternatives:

Follow-up: 48-72 hours to assess improvement after medication change.

Dehydration/electrolyte abnormality#

Education:

• Not drinking enough fluids can cause confusion
• Replacing fluids and correcting electrolytes should help
• Prevention is important—encourage regular fluid intake

Treatment:

• Oral rehydration if able to drink (encourage small, frequent sips)
• IV fluids if unable to tolerate oral or severely dehydrated (usually ED)
• Correct specific electrolyte abnormalities

Hyponatremia (common in elderly on thiazides):

• If mild (Na 125-134) and asymptomatic: fluid restrict, hold thiazide
• If moderate-severe (Na <125) or symptomatic: ED for monitored correction

Follow-up: Recheck BMP in 24-48 hours; ensure adequate intake.

Constipation/fecal impaction#

Education:

• Severe constipation can cause confusion in older adults
• Relieving the constipation should help the confusion
• Prevention with regular bowel regimen is important

Treatment:

• Disimpaction if impacted (manual or enema)
• Osmotic laxative: Polyethylene glycol (MiraLAX) 17 g daily
• Stimulant laxative: Senna 8.6-17.2 mg at bedtime
• Increase fluids and fiber
• Review medications causing constipation (opioids, anticholinergics)

Follow-up: 24-48 hours to confirm bowel movement and mental status improvement.

Alcohol withdrawal#

Education:

• Stopping alcohol suddenly after heavy use can be dangerous
• Withdrawal can cause confusion, tremors, seizures, and hallucinations
• Medical treatment is needed to prevent serious complications

Recognition:

• Onset 6-24 hours after last drink
• Tremor, anxiety, sweating, tachycardia, hypertension
• Hallucinations (usually visual)
• Seizures (12-48 hours)
• Delirium tremens (48-96 hours)—medical emergency

Management:

• Mild withdrawal (CIWA <10): May manage outpatient with close monitoring
• Moderate-severe withdrawal: ED/inpatient for benzodiazepine protocol
• Thiamine 100 mg daily (prevent Wernicke’s)
• Folate 1 mg daily
• Multivitamin

Outpatient benzodiazepine taper (mild withdrawal only, reliable patient/caregiver):

Follow-up: Daily contact during acute withdrawal; addiction medicine referral.

Severe agitation requiring pharmacologic management#

Education (to family):

• Medications for agitation are a last resort when safety is at risk
• They don’t treat the underlying cause—we still need to find and fix that
• These medications have risks in elderly patients

Treatment (use sparingly, lowest dose, shortest duration):

Black box warning: Antipsychotics increase mortality in elderly with dementia. Use only when benefits outweigh risks.

What NOT to use:

• Benzodiazepines (worsen delirium except in alcohol/benzo withdrawal)
• Diphenhydramine (anticholinergic—worsens delirium)
• Physical restraints (increase agitation, injury risk)

Follow-up: Reassess within hours; discontinue antipsychotic as soon as possible.

Follow-up#

During acute delirium:

• Daily contact (phone or visit) until mental status returns to baseline
• Reassess for new precipitants
• Monitor for complications (falls, aspiration, skin breakdown)

After resolution:

• Follow-up within 1 week
• Assess for residual cognitive impairment (delirium can unmask or accelerate dementia)
• Review and optimize medications
• Discuss prevention strategies
• Cognitive testing: If concerns about baseline cognition, perform MoCA or MMSE 4-6 weeks after delirium resolves (testing during or immediately after delirium is unreliable)

Return precautions:

• Worsening confusion
• Fever
• New symptoms (weakness, falls, difficulty breathing)
• Inability to eat or drink
• Severe agitation or safety concerns

Prognosis counseling:

• Delirium often takes days to weeks to fully resolve
• Some patients have prolonged cognitive effects
• Delirium is associated with increased risk of dementia, functional decline, and mortality
• Prevention of future episodes is critical

Patient instructions#

For family/caregivers (patient may not be able to understand):

• Your loved one has delirium—a sudden change in thinking and awareness caused by a medical problem. This is different from dementia.
• We are working to find and treat the cause. Common causes include infections, medication side effects, dehydration, and constipation.
• Delirium usually gets better once we treat the underlying problem, but it may take days to weeks to fully resolve.
• You can help by:
  • Staying calm and speaking in a reassuring voice
  • Reminding them where they are, what day it is, and who you are
  • Keeping the room well-lit during the day and dim at night
  • Making sure they have their glasses and hearing aids
  • Encouraging them to drink fluids and eat
  • Helping them get out of bed and walk if it’s safe
  • Avoiding arguing if they say things that don’t make sense
• Call us or go to the ER if they develop fever, become much more confused, can’t be woken up, have new weakness, or you’re concerned about safety.
• Do not give them any new medications, including over-the-counter sleep aids or antihistamines, without checking with us first.

Smartphrase snippets#

.DELIRIUMEVAL Acute confusion/delirium evaluation in [age]-year-old with [baseline: intact cognition / known dementia]. Change noted [timeframe]. Per [caregiver], patient is [description of change]. CAM: [positive/negative] with [acute onset, inattention, disorganized thinking, altered LOC]. Vital signs: [stable / abnormal]. Precipitant evaluation: [findings]. Medications reviewed: [high-risk meds identified or none]. Workup: [UA, BMP, CBC, other]. Assessment: Delirium likely secondary to [precipitant]. Plan: [Treat underlying cause; stop/reduce offending meds; supportive care; safety plan]. Follow-up [timeframe].

.DELIRIUMUTI Delirium in setting of UTI. UA positive for [findings]. No other clear precipitant identified. Starting [antibiotic] for [X] days. Counseled that confusion may take several days to resolve even with treatment. Stopping [anticholinergic/sedating med] to reduce delirium risk. Supportive measures reviewed with [caregiver]. Will follow up in 24-48 hours to assess response. Return precautions: worsening confusion, fever, inability to take fluids, safety concerns.

.DELIRIUMDISCHARGE Delirium resolved. Mental status returned to baseline per [patient/caregiver]. Precipitant was [cause] which has been treated. Medications reviewed and [changes made]. Counseled that delirium increases risk of future cognitive problems and recurrent delirium. Prevention strategies discussed: maintain hydration, avoid anticholinergic medications, ensure adequate sleep, prompt treatment of infections. Follow-up in [1-2 weeks] for reassessment. Consider formal cognitive testing if concerns persist.

Coding/billing notes#

• F05: Delirium due to known physiological condition
• R41.0: Disorientation, unspecified
• R41.82: Altered mental status, unspecified
• F10.231: Alcohol dependence with withdrawal delirium
• G93.41: Metabolic encephalopathy
• K72.91: Hepatic failure with coma (hepatic encephalopathy)

Documentation tips:

• Document baseline cognitive status
• Document CAM or 4AT results
• Document identified precipitant(s)
• Document medications reviewed and changes made
• Document safety plan and caregiver involvement