Treatment of Delirium When All Investigations Are Normal

Step 1 — Re-examine Potential Precipitants (Even Without Lab Abnormalities)

"A key step in preventing and treating delirium is recognition of the disease itself... The consultant should attempt to discontinue medications that can worsen cognitive status (e.g., anticholinergic and antispasmodic medications)." — Goldman-Cecil Medicine

Step 2 — Nonpharmacologic Management (FIRST-LINE)

Environmental & Cognitive Reorientation

• Provide a calm, well-lit, comfortable environment
• Use orienting cues: clocks, calendars, familiar objects from home
• Frequent reorientation by nurses, family, and caregivers — remind patient of time, date, and location
• Limit room and staff changes to reduce environmental confusion
• Keep family members present as much as possible — continuous familiar presence is therapeutic

Sleep-Wake Cycle Restoration

• Allow uninterrupted sleep at night — avoid nocturnal vitals checks when possible
• Maximize natural daylight during the day
• Melatonin 2–5 mg orally in the evening restores circadian rhythm
• Alternatively, Ramelteon 8 mg nightly (melatonin receptor agonist)

Mobilization

• Early ambulation — get the patient into a chair or walking daily
• Physical therapy and occupational therapy — especially for elderly surgical patients
• Avoid physical restraints (they worsen agitation and delirium)

One-to-One Nursing Observation

• May be necessary for patients at risk of self-harm or falls
• Specialized units (Acute Care for the Elderly / ACE units) benefit high-risk patients

Step 3 — Pharmacologic Management (Reserved for Refractory Cases)

• Nonpharmacologic measures are insufficient
• Patient is hyperactive with risk of harm to self, other patients, or caregivers

"Pharmacologic intervention should be reserved for patients who are not responsive to nonpharmacologic methods or for hyperactive patients who are at risk of harming themselves." — Sabiston Textbook of Surgery

Antipsychotics (First-Line Pharmacologic Agents)

— Kaplan & Sadock's Comprehensive Textbook of Psychiatry

• Prophylactic antipsychotics are not recommended even in high-risk patients
• Antipsychotics may prolong the course of delirium if used indiscriminately
• Avoid in Lewy body dementia — severe neuroleptic sensitivity reaction risk

Benzodiazepines (Second-Line / Specific Indications)

• Alcohol or benzodiazepine withdrawal
• Substance intoxication/withdrawal syndromes

"Benzodiazepines can worsen delirium" — use only for specific indications above, not for undifferentiated delirium.

Combination Approach (Combative Patients with Immediate Safety Threat)

• Haloperidol 5 mg + Lorazepam 2 mg IM — superior to monotherapy for acute undifferentiated agitation — Rosen's Emergency Medicine

ICU Delirium

• IV Dexmedetomidine 0.1 μg/kg/hr — reduces postoperative delirium; evidence is context-specific (best in cardiac/non-cardiac surgical ICU settings)

Summary Algorithm

Delirium + Normal Investigations
        ↓
1. Review & stop offending medications (anticholinergics, opioids, benzos)
2. Remove catheters/lines early
3. Correct pain, dehydration, constipation
        ↓
NONPHARMACOLOGIC (ALL patients):
  – Reorient, familiar faces, clocks/calendars
  – Quiet/well-lit environment, uninterrupted sleep
  – Early mobilization, physio/OT
  – Melatonin 2–5 mg at night
        ↓
If insufficient OR hyperactive with safety risk:
PHARMACOLOGIC:
  – Antipsychotic (Haloperidol PO/IM) first-line
  – Add Lorazepam ONLY for withdrawal-related delirium
  – Dexmedetomidine for ICU patients

Key Principle