## Clinical Diagnosis: Delirium Tremens (DTs) ### Key Diagnostic Features **High-Yield:** Delirium tremens is the **most severe form of alcohol withdrawal syndrome**, occurring 48–96 hours after last drink, with a mortality rate of 5–15% if untreated. **Classic Triad of DTs:** 1. **Autonomic hyperactivity** (tachycardia, hypertension, fever, diaphoresis) 2. **Disorientation/delirium** (confusion, disorientation to time and place) 3. **Visual/tactile hallucinations** (classically "formication"—insects crawling on skin) This patient has all three features: - Hallucinations (visual: insects) - Disorientation (person only, not time/place) - Autonomic instability (fever 38.5°C, HR 120, BP 160/100, tachypnea, diaphoresis) - Timeline: day 3 of abstinence (48–72 hours) ### Differential Diagnosis | Feature | Delirium Tremens | Alcohol Hallucinosis | Wernicke Encephalopathy | Hepatic Encephalopathy | |---------|------------------|----------------------|------------------------|------------------------| | **Onset** | 48–96 hrs post-cessation | 12–48 hrs | Variable (acute or chronic) | Insidious or acute | | **Sensorium** | Disoriented, delirious | Clear, oriented | Confused, ataxia | Confused, asterixis | | **Hallucinations** | Visual + tactile | Visual/auditory only | None | None | | **Autonomic signs** | **Marked** (fever, tachy, HTN) | Minimal | Absent | Absent | | **Temperature** | **Elevated (38–40°C)** | Normal | Normal | Normal | | **Mortality** | 5–15% untreated | <1% | High if untreated | Variable | **Key Point:** The presence of **fever + disorientation + hallucinations + autonomic hyperactivity** is pathognomonic for delirium tremens, not simple alcohol hallucinosis (which occurs with clear sensorium). ## Immediate Management ### 1. Aggressive Benzodiazepine Therapy - **Lorazepam 2–4 mg IV/IM every 5–10 minutes** until patient is calm and sedated - May require **higher cumulative doses** (50–100+ mg over 24 hrs) in DTs - Goal: suppress autonomic hyperactivity and prevent seizures ### 2. Metabolic Correction - **Thiamine 100 mg IV/IM** (before dextrose to prevent Wernicke) - **Dextrose 50% IV** (if hypoglycaemic) - Correct **Mg²⁺, K⁺, Ca²⁺, PO₄³⁻** deficiencies - IV fluids for dehydration ### 3. Supportive Care - **ICU admission** (high mortality, requires continuous monitoring) - Treat underlying infections (aspiration pneumonia, UTI) - Manage fever (cooling measures, acetaminophen) - Nutritional support ### 4. Antipsychotics (Adjunctive Only) - **NOT first-line** for DTs - Use only if hallucinations persist despite benzodiazepine control - Haloperidol or olanzapine may be added, but benzodiazepines are the cornerstone **Warning:** Antipsychotics alone **do NOT prevent seizures** and **do NOT treat the underlying GABA deficit**; they are inadequate monotherapy for DTs. ## Why Each Option Is Wrong | Option | Why Wrong | |--------|----------| | Alcohol hallucinosis + antipsychotic | Hallucinosis presents with **clear sensorium and minimal autonomic signs**; this patient has **fever, disorientation, and marked autonomic hyperactivity**—diagnostic of DTs, not hallucinosis. Antipsychotics alone are insufficient for DTs. | | Wernicke encephalopathy | Wernicke presents with **ophthalmoplegia, ataxia, confusion** (classic triad); **fever and hallucinations are NOT typical**. Thiamine is essential but not the primary intervention here. | | Hepatic encephalopathy | No mention of liver disease, jaundice, or asterixis; ammonia level is not the next step. DTs is far more likely given the timeline and presentation. | **Mnemonic:** **DTs = FEVER + DELIRIUM + HALLUCINATIONS** (vs. hallucinosis = clear mind + hallucinations only) ## Prognosis - With aggressive benzodiazepine therapy and ICU care: mortality <5% - Without treatment: mortality 5–15% - Recovery typically occurs within 3–7 days with supportive care [cite:Harrison 21e Ch 474; DSM-5 Alcohol Withdrawal Disorder]
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