A 52-year-old male from Delhi presents to the emergency department with tremors, diaphoresis, and agitation. He reports consuming 8–10 pegs of whisky daily for the past 15 years and stopped drinking 36 hours ago after his wife threatened to leave. On examination, he is febrile (38.2°C), tachycardic (110 bpm), and has coarse tremors of the hands. Blood pressure is 150/95 mmHg. He is oriented to person and place but not time. What is the most appropriate immediate pharmacological intervention?

Explanation

## Clinical Presentation Analysis This patient presents with **alcohol withdrawal syndrome** progressing toward **delirium tremens (DTs)**. The timeline (36 hours post-cessation), autonomic hyperactivity (tachycardia, hypertension, fever, diaphoresis), tremor, disorientation, and agitation are classic features. ## Pathophysiology of Alcohol Withdrawal **Key Point:** Chronic alcohol use suppresses the glutamatergic (excitatory) and enhances GABAergic (inhibitory) neurotransmission. Upon abrupt cessation, loss of GABA-mediated inhibition and unopposed glutamate activity cause hyperexcitability. **High-Yield:** Alcohol withdrawal progresses through stages: 1. **Minor withdrawal** (6–24 hrs): tremor, diaphoresis, tachycardia, anxiety 2. **Hallucinosis** (12–48 hrs): visual/auditory hallucinations, orientation intact 3. **Withdrawal seizures** (6–48 hrs): generalized tonic-clonic, peak at 12–24 hrs 4. **Delirium tremens** (24–96 hrs): autonomic hyperactivity + disorientation + hallucinations; mortality 5–15% if untreated ## Management Algorithm ```mermaid flowchart TD A[Alcohol withdrawal suspected]:::outcome --> B[Assess severity & complications]:::decision B -->|Tremor, autonomic signs| C[Thiamine 100 mg IV/IM first]:::action C --> D[Benzodiazepine: Lorazepam or Diazepam]:::action D --> E[Monitor for seizures & DTs]:::decision E -->|Seizure or DTs| F[Escalate benzodiazepine dose]:::action E -->|Stable| G[Supportive care, nutrition, electrolytes]:::action H[Antipsychotics NOT first-line]:::urgent ``` ## Correct Management: Thiamine + Benzodiazepine + Supportive Care **Thiamine 100 mg IV/IM FIRST:** - Prevents Wernicke encephalopathy (thiamine deficiency common in chronic alcoholics) - Must precede dextrose (if given) to avoid precipitating Wernicke syndrome - [cite:Harrison 21e Ch 395] **Lorazepam 2–4 mg IV/IM as first-line benzodiazepine:** - Rapid onset, short-to-intermediate half-life, no active metabolites - Preferred over diazepam in liver disease (common in alcoholics) - Titrate to light sedation; repeat every 5–10 minutes until seizure risk subsides or patient is sedated - [cite:KD Tripathi 8e Ch 31] **Supportive measures:** - Correction of electrolytes (hypomagnesemia, hypokalemia, hypophosphatemia) - Hydration and nutritional support - Monitoring in ICU if DTs or seizures present ## Why Each Distractor Is Wrong | Option | Reason | |--------|--------| | **Haloperidol + chlorpromazine** | Antipsychotics are NOT first-line for alcohol withdrawal. They lower seizure threshold, increase mortality in DTs, and do not address the underlying GABA/glutamate imbalance. Used only for hallucinations *after* benzodiazepines have controlled autonomic symptoms. | | **Diazepam orally alone** | Oral route is inappropriate in acute withdrawal with altered mental status and risk of aspiration. Diazepam also has a long half-life and active metabolites, increasing risk of over-sedation in cirrhotic patients. Monotherapy without thiamine risks Wernicke encephalopathy. | **Clinical Pearl:** The mnemonic **CIWA-Ar** (Clinical Institute Withdrawal Assessment for Alcohol scale) guides benzodiazepine dosing in real time; scores ≥20 warrant intensive monitoring and higher doses. [cite:Harrison 21e Ch 395] **Warning:** Never give dextrose-containing fluids before thiamine in an alcoholic — risk of acute Wernicke encephalopathy and permanent neurological damage.