A 38-year-old woman with a 12-year history of alcohol dependence is admitted to the psychiatric ward for detoxification. On day 2 of abstinence, she develops visual hallucinations (seeing insects crawling on her skin), tremor, and autonomic instability (HR 125 bpm, BP 160/95 mmHg, temperature 38.2°C). She is oriented to person and place but not time. Which of the following best describes her current clinical state, and what is the immediate next step?

## Clinical Diagnosis: Delirium Tremens (DTs) This patient presents with the classic triad of delirium tremens occurring 24–48 hours after alcohol cessation: **hallucinations** (visual, tactile), **autonomic hyperactivity**, and **altered mental status** (disorientation to time). ### Differential Diagnosis of Alcohol Withdrawal Syndromes | Syndrome | Onset | Duration | Key Features | Mortality | |----------|-------|----------|--------------|----------| | **Tremulousness** | 6–24 hrs | Hours | Fine tremor, autonomic signs, normal cognition | <1% | | **Hallucinosis** | 12–48 hrs | Hours–days | Visual/auditory hallucinations, **clear sensorium** | <5% | | **Withdrawal seizures** | 6–48 hrs | Seconds–minutes | Generalized tonic-clonic, brief | 5–15% | | **Delirium tremens** | 24–96 hrs | Hours–days | Hallucinations + **disorientation + autonomic crisis** | **5–15%** | **Key Point:** The critical distinction between **alcoholic hallucinosis** and **delirium tremens** is the **presence of disorientation and delirium**. This patient is disoriented to time, indicating delirium tremens, not simple hallucinosis. ### Pathophysiology of Delirium Tremens ```mermaid flowchart TD A[Chronic alcohol use]:::outcome --> B[GABA receptor downregulation<br/>Glutamate receptor upregulation]:::outcome B --> C[Abrupt alcohol cessation]:::action C --> D[Loss of GABA inhibition<br/>Unopposed glutamate excitation]:::outcome D --> E[CNS hyperexcitability]:::outcome E --> F{Severity}:::decision F -->|Mild| G[Tremor, autonomic signs]:::outcome F -->|Moderate| H[Hallucinations + autonomic crisis]:::outcome F -->|Severe| I[Delirium + hallucinations<br/>+ autonomic collapse]:::urgent I --> J[Delirium Tremens]:::urgent ``` ### Management of Delirium Tremens **High-Yield:** Delirium tremens is a **medical emergency** with mortality of 5–15% if untreated. Management priorities: 1. **Benzodiazepine escalation** (not antipsychotics alone) - Lorazepam 4–8 mg IV/IM q15–30 min until agitation controlled - May require 50–100+ mg in first 24 hours - Goal: calm, oriented patient 2. **Supportive care** - ICU-level monitoring (cardiac, respiratory) - Aggressive fluid resuscitation (DTs causes severe dehydration) - Electrolyte correction (hypokalemia, hypomagnesemia, hypophosphatemia common) 3. **Nutritional support** - Thiamine 100 mg IV/IM daily (already given in withdrawal protocol) - Folic acid, multivitamin 4. **Adjunctive agents** (only AFTER benzodiazepine control) - Haloperidol 5 mg IM q4–6h for persistent hallucinations (NOT first-line) - Beta-blockers (propranolol) for tachycardia (if BP permits) **Warning:** Antipsychotics (haloperidol, chlorpromazine) are NOT first-line in delirium tremens. They lower seizure threshold, may worsen delirium, and do not address the underlying autonomic crisis. Use only as adjuncts after benzodiazepine-induced sedation. **Clinical Pearl:** The presence of **fever (38.2°C)** in this patient is ominous. It suggests severe autonomic dysregulation and increased risk of rhabdomyolysis, acute kidney injury, and death. Aggressive cooling measures and ICU admission are mandatory. **Mnemonic:** **DTs = Delirium + autonomic crisis + Danger** — requires benzodiazepines + ICU, not antipsychotics. [cite:Harrison 21e Ch 473; DSM-5]