Figure Core mechanisms examiners expect in CICM/FFICM/EDIC answers. Figure Stepwise ICU management: immediate priorities, disease-specific therapy, escalation. Figure Classification and decision thresholds used in exam answers. Alcohol withdrawal spectrum: tremor/anxiety (6-12h) → seizures (12-48h) → delirium tremens (48-96h — confusion + hallucinations + autonomic hyperactivity — mortality 5-15%) . Pathophysiology: chronic alcohol → GABA downregulation + glutamate upregulation → when stopped → hyperexcitable brain. Management : (1) BENZODIAZEPINES first-line (diazepam/lorazepam — CIWA-Ar-guided or symptom-triggered — Saitz 1994). (2) THIAMINE before glucose (prevent Wernicke — 100 mg IV). (3) Correct Mg + K + phosphate (all depleted). (4) Phenobarbital for refractory. (5) Supportive (IV fluids, ICU for severe). Seizures: treat with benzos (NOT phenytoin).
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Figure Alcohol withdrawal — the spectrum from minor withdrawal (6-12 h) to seizures (12-48 h) to delirium tremens (48-96 h, 5-15 per cent mortality). Symptom-triggered benzodiazepines (CIWA-Ar) for mild; front-loaded diazepam infusion for severe. Give thiamine before any glucose to prevent Wernicke encephalopathy.
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SAQ — Delirium tremens in the ICU 10 minutes · 10 marks
Reveal all A 49-year-old man with chronic alcohol dependence (1 bottle of spirits/day) is admitted 60 hours after his last drink following a seizure at home. He is grossly tremulous, agitated, hallucinating (seeing insects on the wall), diaphoretic, HR 142, BP 184/105, temp 39.1°C, RR 30, GCS 13, with Mg²⁺ 0.45 mmol/L, K⁺ 2.9 mmol/L, phosphate 0.5 mmol/L, CK 4,200 U/L, and a CIWA-Ar of 27. His wife gave him a dextrose-containing IV fluid in the ambulance.
a Discuss the diagnosis, pathophysiology, and why phenytoin is inappropriate for his withdrawal seizure.
b Outline your ICU management with specific drug doses, and explain the rationale for giving thiamine before glucose.
c Explain the CIWA-Ar score thresholds and why symptom-triggered dosing is preferred over a fixed taper.
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SAQ — Wernicke encephalopathy and refractory withdrawal 10 minutes · 10 marks
Reveal all A 56-year-old malnourished woman with alcohol cirrhosis (Child-Pugh B) is admitted in severe AWS. Despite 80 mg of IV diazepam in 4 h she remains severely agitated, tremulous and has developed nystagmus, lateral rectus palsy and a wide-based gait when she tries to stand. The team has just prescribed a 5% dextrose infusion for rehydration.
a What complication has developed, why, and outline the immediate management with drug doses appropriate to her cirrhosis.
b Outline the pharmacological options for benzodiazepine-refractory alcohol withdrawal and their mechanisms.
c Describe the long-term consequence if her Wernicke is inadequately treated and how you would prevent it.
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Clinical pearls
High-yield alcohol withdrawal points for CICM/FFICM exam
Pathophysiology — GABA downregulation + glutamate upregulation. (1) NORMAL BRAIN: balance between INHIBITION (GABA — gamma-aminobutyric acid — the main inhibitory neurotransmitter) and EXCITATION (glutamate — the main excitatory neurotransmitter). (2) ALCOHOL EFFECTS ON BRAIN: (a) ENHANCES GABA (binds GABA-A receptor → increases chloride influx → hyperpolarisation → INHIBITION — like benzodiazepines but at different site). (b) INHIBITS NMDA/ glutamate (reduces excitation). (c) Net effect: CNS DEPRESSION (sedation, anxiolysis, ataxia). (3) CHRONIC ALCOHOL → BRAIN ADAPTS (to maintain homeostasis despite constant alcohol-induced GABA enhancement + NMDA inhibition): (a) DOWNREGULATES GABA receptors (fewer GABA-A receptors → less inhibitory capacity — the brain reduces GABA signalling because alcohol was providing extra). (b) UPREGULATES NMDA receptors (more NMDA → more excitatory capacity — the brain increases glutamate signalling because alcohol was suppressing it). (c) Net: the brain becomes HYPEREXCITABLE if alcohol is removed (GABA too low + glutamate too high — the adaptations were COUNTERACTING alcohol — now alcohol is gone → the adaptations cause hyperexcitability). (4) WHEN ALCOHOL REMOVED: (a) Loss of alcohol's GABA enhancement → less inhibition (already downregulated GABA → very low inhibition). (b) Loss of alcohol's NMDA inhibition → more excitation (already upregulated NMDA → very high excitation). (c) Net: MASSIVE HYPEREXCITABILITY → tremor → seizures → DTs. (5) KEY: chronic alcohol → GABA down + glutamate up → alcohol removed → hyperexcitable brain → withdrawal. Treatment: REPLACE GABA effect (benzodiazepines — enhance GABA) → calm the brain.[6] }Delirium tremens — timing + features + mortality. (1) TIMING: 48-96 HOURS after last drink (LATE withdrawal — not immediate — usually after the patient has been admitted to hospital for another reason and can't drink). (2) CLINICAL (TRIAD): (a) CONFUSION (global — disorientation in time/place/person — impaired sensorium — unlike alcoholic hallucinosis [oriented + clear sensorium — just hallucinating]). (b) HALLUCINATIONS (VIVID — visual [most common — seeing insects, animals, people], tactile [formication — sensation of insects crawling on skin], auditory [hearing voices]). (c) AUTONOMIC HYPERACTIVITY (tachycardia >120, hypertension [SBP >160], fever >38.5, diaphoresis [profuse sweating], tremor [coarse], agitation [severe — may require physical/chemical restraint]). (3) MORTALITY: 5-15% untreated (from arrhythmia [AF from autonomic storm], hyperthermia, aspiration, seizures, fluid/electrolyte derangement, cardiovascular collapse). WITH treatment: 1-5% (benzodiazepine + ICU support). (4) DIFFERENTIAL: (a) SEPSIS (fever + tachycardia + confusion — ALWAYS exclude — blood cultures + source — alcoholics commonly have infection [pneumonia, spontaneous bacterial peritonitis, cellulitis]). (b) HEPATIC ENCEPHALOPATHY (confusion from liver failure — asterixis [flapping tremor — different from withdrawal tremor] + elevated ammonia — check LFTs + ammonia). (c) HYPOGLYCAEMIA (confusion from low glucose — alcoholics are hypoglycaemic — check glucose). (d) INTRACRANIAL (subdural haematoma from fall while intoxicated — CT brain). (e) DRUG INTOXICATION/WITHDRAWAL (other drugs — opioid, benzodiazepine, stimulant). (5) KEY: DTs = 48-96h + confusion + hallucinations + autonomic hyperactivity. ALWAYS exclude SEPSIS (common mimic — alcoholics frequently infected). Mortality 5-15% untreated → ICU + high-dose benzo.[4] }Benzodiazepines — first-line (replace GABA). (1) MECHANISM: benzodiazepines BIND to GABA-A receptor (different site from alcohol — allosteric modulator — increases GABA's effect → more chloride influx → more inhibition). This REPLACES the GABA-enhancing effect that alcohol was providing → calms the hyperexcitable brain → controls withdrawal. (2) WHY BENZOS (not other sedatives): (a) CROSS-TOLERANT with alcohol (both enhance GABA → benzos substitute for alcohol → taper → gradual readaptation). (b) PROVEN EFFICACY (multiple RCTs — benzos reduce severity + complications [seizures, DTs] + mortality — Cochrane meta-analysis — benzos are the gold standard). (c) ANTICONVULSANT (prevent withdrawal seizures — by enhancing GABA → raise seizure threshold). (3) AGENTS: (a) DIAZEPAM (long-acting — preferred for ward/outpatient — 10-20 mg PO q1-2h PRN [CIWA-Ar] → self-tapering [long half-life 30-200h including active metabolites] → smooth recovery). (b) LORAZEPAM (short-intermediate — preferred for ICU/liver disease — 1-2 mg PO/IV q1-2h → no active metabolites [direct glucuronidation → safe in liver failure] → predictable). (c) CHLORDIAZEOXIDE (long-acting — traditional outpatient — 25-50 mg PO q6-8h → taper). (d) MIDAZOLAM (short-acting — for IV infusion in severe DTs — 0.5-2 mg/hr → titratable → but short half-life → need continuous infusion). (4) CHOICE: (a) WARD/OUTPATIENT: diazepam (long-acting, self-taper, oral) or chlordiazepoxide. (b) ICU/SEVERE: lorazepam IV (no active metabolites — liver-safe) or midazolam infusion (titratable). (c) LIVER FAILURE: lorazepam (safe — direct glucuronidation — no oxidative metabolism — no accumulation). (5) DOSING STRATEGY: (a) SYMPTOM-TRIGGERED (CIWA-Ar-guided) — PREFERRED (Saitz 1994 — less total drug, shorter treatment, same efficacy). (b) FIXED-SCHEDULE (if CIWA-Ar unreliable). (c) FRONT-LOADING (severe — diazepam 20 mg q1h until calm). (d) INFUSION (DTs — lorazepam/midazolam infusion — titrate to RASS). (6) KEY: benzodiazepines are FIRST-LINE for alcohol withdrawal (replace GABA effect — cross-tolerant — anticonvulsant — proven). CIWA-Ar-guided (symptom-triggered) preferred. Diazepam (ward), lorazepam (ICU/liver).[6] }Thiamine before glucose — prevent Wernicke. (1) WHY: (a) Thiamine (vitamin B1) is DEPLETED in alcoholics (poor dietary intake + alcohol impairs absorption + alcohol increases metabolism). (b) Thiamine is a COFACTOR for: pyruvate dehydrogenase (converts pyruvate → acetyl-CoA → enters Krebs cycle — glucose metabolism REQUIRES thiamine) and transketolase (pentose phosphate pathway). (c) If you give GLUCOSE to a thiamine-deficient alcoholic → glucose metabolism CONSUMES the remaining thiamine → ACUTE thiamine depletion → WERNICKE ENCEPHALOPATHY (acute brain injury from thiamine deficiency). (2) WERNICKE ENCEPHALOPATHY: (a) TRIAD (only 10% have ALL three): (i) ATAXIA (wide-based gait — cerebellar [vermis damage]). (ii) OPHTHALMOPLEGIA (nystagmus [horizontal — most common], lateral rectus palsy [CN VI — bilateral — from brainstem nuclei damage], conjugate gaze palsy). (iii) CONFUSION (global — disorientation, apathy, inattention, impaired memory). (b) If UNTREATED → KORSAKOFF SYNDROME (permanent ANTEROGRADE AMNESIA [can't form new memories — confabulation [makes up stories to fill gaps] — 'I had eggs for breakfast' [didn't — confabulated] — permanent — IRREVERSIBLE]). (c) MORTALITY: 10-20% (if untreated — from brainstem damage). (3) MANAGEMENT: (a) THIAMINE 100 mg IV/IM BEFORE any glucose-containing fluid (5% dextrose, TPN, 50% dextrose for hypoglycaemia). (b) If WERNICKE SUSPECTED (any of triad in alcoholic): HIGH-DOSE thiamine 300-500 mg IV TID for 3-5 days → then 100 mg daily (maintenance — lifelong for alcoholics). (c) THEN give glucose (for hypoglycaemia — AFTER thiamine). (d) ALSO: folate (1 mg IV/IM — depleted — megaloblastic anaemia) + multivitamins. (4) COMMON ERROR: hypoglycaemic alcoholic in ED → given 50% dextrose IV (rapid glucose) WITHOUT thiamine → precipitates Wernicke → permanent brain damage. ALWAYS: THIAMINE FIRST → THEN GLUCOSE. (5) KEY: THIAMINE BEFORE GLUCOSE — prevents Wernicke encephalopathy (acute → Korsakoff [permanent]). Simple + life-saving. 100 mg IV before any dextrose.[5] }Withdrawal seizures — treat with benzos (NOT phenytoin). (1) WITHDRAWAL SEIZURES: (a) TIMING: 12-48 HOURS after last drink (before DTs). (b) TYPE: generalised tonic-clonic (usually 1-6 seizures in 6 hours — brief — self-limiting — status epilepticus RARE [but can occur]). (c) MECHANISM: GABA withdrawal (loss of inhibition → hyperexcitable cortex → seizure). (2) TREATMENT: (a) BENZODIAZEPINE (first-line — lorazepam 2-4 mg IV or diazepam 5-10 mg IV → repeat q5-10min if ongoing → may need infusion). (b) MECHANISM: benzo → enhances GABA → raises seizure threshold → stops seizure. (3) WHY NOT PHENYTOIN: (a) Phenytoin (and other traditional antiepileptics — levetiracetam, valproate) BLOCK SODIUM CHANNELS (or other mechanisms for EPILEPSY). (b) Withdrawal seizures are GABA-MEDIATED (from GABA withdrawal) → NOT sodium-channel mediated → phenytoin doesn't ADDRESS the underlying mechanism. (c) STUDIES: phenytoin is INEFFECTIVE for alcohol withdrawal seizures (doesn't reduce seizure recurrence compared to placebo — Ratcliffe 1989; Alldredge 1989). (d) ONLY benzos work (GABA enhancement → addresses the mechanism). (4) EXCEPTION: if patient has CONCURRENT EPILEPSY (pre-existing seizure disorder on antiepileptics + alcohol withdrawal precipitated a seizure) → continue their regular antiepileptics (don't stop them — but the withdrawal seizure is STILL treated with benzo first). (5) KEY: alcohol withdrawal seizures → BENZODIAZEPINE (NOT phenytoin/levetiracetam — they're ineffective — withdrawal seizures are GABA-mediated). Lorazepam 2-4 mg IV (reassess + repeat).[4] }CIWA-Ar — symptom-triggered dosing. (1) CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol — Revised): standardised 10-item scale for ASSESSING alcohol withdrawal SEVERITY → guides benzodiazepine dosing. (2) THE 10 ITEMS (each scored 0-7 — total 0-67): (a) Nausea and vomiting. (b) Tremor. (c) Paroxysmal sweats. (d) Anxiety. (e) Agitation. (f) Tactile disturbances (itching, numbness, pins and needles). (g) Auditory disturbances (sounds bothering, hearing things). (h) Visual disturbances (sensitivity to light, seeing things). (i) Headache, fullness in head. (j) Orientation and clouding of sensorium. (3) SCORING: (a) <8 = MILD (no medication or PRN benzo only). (b) 8-15 = MODERATE (benzo — CIWA-Ar-guided — reassess every 1-2h). (c) >15 = SEVERE (regular benzo dosing — consider ICU if >20 or DTs developing). (4) SYMPTOM-TRIGGERED (CIWA-Ar-guided) DOSING: (a) Assess CIWA-Ar every 1-2h. (b) If CIWA-Ar >8 → give benzo (e.g., diazepam 10-20 mg PO or lorazepam 1-2 mg IV). (c) Reassess in 1-2h → if still >8 → give more. (d) Continue until CIWA-Ar <8 consistently (then reduce frequency of assessment). (5) EVIDENCE: Saitz (1994, NEJM): symptom-triggered (CIWA-Ar-guided) vs fixed-schedule → symptom-triggered: (a) LESS total benzodiazepine dose (~100 mg less diazepam equivalent). (b) SHORTER treatment duration (by ~1 day). (c) SAME efficacy (no difference in complication rate [seizures, DTs]). (d) LESS over-sedation (targeted dosing → only give when symptomatic). (6) PREFERRED APPROACH: symptom-triggered (CIWA-Ar-guided) → less drug + shorter treatment + same efficacy → STANDARD OF CARE. (7) LIMITATIONS: (a) Requires NURSING TIME (assess every 1-2h → workload). (b) Unreliable if PATIENT CAN'T COMMUNICATE (intubated, demented, severely agitated — can't assess orientation/hallucinations/anxiety) → use fixed-schedule or RASS-guided instead. (8) KEY: CIWA-Ar-guided (symptom-triggered) dosing → STANDARD → less drug + shorter treatment + same efficacy (Saitz 1994). Assess every 1-2h → if >8 → give benzo → reassess.[1] }Phenobarbital — for refractory. (1) INDICATION: SEVERE withdrawal (DTs) NOT responding to high-dose benzodiazepine (e.g., agitation/delirium despite diazepam 60+ mg or lorazepam infusion 4+ mg/hr). (2) MECHANISM: barbiturate → ENHANCES GABA (different binding site on GABA-A — prolongs chloride channel OPENING [unlike benzo which increases FREQUENCY of opening] → STRONGER GABA effect → more sedation). ALSO: inhibits glutamate (NMDA) at high doses. (3) DOSE: (a) LOADING: phenobarbital 130-260 mg IV/IM (over 15-30 min — slow — barbiturate causes hypotension/respiratory depression if too fast). (b) MAINTENANCE: 30 mg q6h or 60 mg q8h PO/IV. (c) PRN: additional 60-130 mg if agitation. (d) TITRATE: to RASS −2 to 0 (calm/rousable). (4) ADVANTAGES: (a) LONG half-life (2-6 DAYS) → self-tapering → smooth withdrawal resolution (no abrupt stop → no rebound withdrawal). (b) EFFECTIVE for refractory (controls DTs when benzo alone fails). (c) LESS respiratory depression than equivalent high-dose benzo (for the same level of sedation — barbiturates cause less respiratory depression than benzodiazepines at equipotent doses). (5) DISADVANTAGES: (a) LONG half-life → can't titrate rapidly (if over-sedated → wait hours-days for clearance → prolonged sedation). (b) No reversal agent (unlike benzo [flumazenil] — no barbiturate antidote — support until clears). (c) Hypotension (vasodilation — especially IV loading). (d) Respiratory depression (at high doses — especially with concurrent benzo). (6) PROTOCOL (Mueller 2018): phenobarbital (loading + maintenance) + benzodiazepine (PRN for breakthrough) → REDUCED ICU stay + ventilation days (compared to benzo alone for severe withdrawal). (7) DEXMEDETOMIDINE (alpha-2 agonist): adjunct — reduces sympathetic outflow (autonomic hyperactivity — tachycardia, hypertension, diaphoresis) — but has NO GABA effect → DOESN'T prevent seizures → must be used WITH benzo/phenobarbital (not alone). Useful for autonomic control when benzo alone doesn't control tachycardia/hypertension/agitation. (8) PROPofOL: if intubated + refractory → deep sedation — but NOT first-line (propofol infusion syndrome risk at high doses + prolonged use). (9) KEY: phenobarbital for refractory DTs (not responding to high-dose benzo) — long-acting + effective + self-tapering. Dexmedetomidine as adjunct (autonomic control). Propofol for intubated/refractory.[3] }Magnesium — depleted + worsens withdrawal. (1) WHY DEPLETED: (a) POOR INTAKE (alcoholics have poor diet — low Mg). (b) RENAL WASTING (alcohol → increased renal Mg excretion — directly toxic to renal tubule → Mg loss). (c) WITHDRAWAL → catecholamine surge → shifts Mg into cells + increases renal Mg loss. (d) VOMITING/DIARRHEA → GI Mg loss. (2) WHY IT MATTERS: (a) LOW Mg → NEURONAL HYPEREXCITABILITY (Mg normally BLOCKS NMDA receptor [inhibits excitation] → low Mg → less NMDA block → more excitation → more tremor/seizures/arrhythmia). (b) LOW Mg → ARRHYTHMIA (Mg needed for Na-K ATPase → low Mg → intracellular K loss → prolonged QT → torsades → VT/VF). (c) LOW Mg → REFRACTORY HYPOKALAEMIA (Mg gates the ROMK channel in kidney → low Mg → renal K wasting → can't correct K+ without correcting Mg first — same principle as hypokalaemia topic). (d) LOW Mg → HYPocalcaemia (Mg needed for PTH secretion + action → low Mg → functional hypoparathyroidism → low Ca → tetany/seizures). (3) MANAGEMENT: (a) REPLACE: MgSO4 1-2 g IV over 1-2h (acute correction) + oral Mg oxide 400-800 mg/day (ongoing). (b) MONITOR: serum Mg (target >0.8) + reflexes (loss of patellar reflex = early toxicity → reduce dose). (c) CAUTION: renal failure (Mg accumulates → hypermagnesaemia → respiratory depression → reduce dose). (4) EVIDENCE: Mg replacement REDUCES withdrawal severity (some studies — not definitive — but biologically plausible + Mg is safe + commonly depleted → replace). (5) KEY: Mg is DEPLETED in alcohol withdrawal → worsens withdrawal (hyperexcitability + arrhythmia + refractory hypokalaemia) → REPLACE (MgSO4 1-2g IV + oral).[4] }Exclude sepsis — fever may be infection not withdrawal. (1) THE PROBLEM: alcohol withdrawal (DTs) causes FEVER + TACHYCARDIA + CONFUSION — which is ALSO the presentation of SEPSIS. Alcoholics are IMMUNOCOMPROMISED (chronic alcohol → immunosuppression) + have MULTIPLE infection risks (aspiration [impaired consciousness], spontaneous bacterial peritonitis [cirrhosis + ascites], pneumonia [impaired cough/ciliary function], cellulitis [poor hygiene + trauma], endocarditis [IV drug use], line infection). (2) CONSEQUENCE: if you assume 'it's just withdrawal' → MISS sepsis → patient deteriorates → dies (sepsis is the #1 killer of alcoholics in ICU — not the withdrawal itself). (3) MANAGEMENT: (a) BLOOD CULTURES (×2 — before antibiotics if possible). (b) CXR (pneumonia — especially aspiration [alcoholics are aspiration risk]). (c) URINALYSIS + culture (UTI — common). (d) ASCITIC FLUID TAP (if ascites — spontaneous bacterial peritonitis [SBP] — neutrophil count >250 → SBP → cefotaxime + albumin). (e) LUMBAR PUNCTURE (if meningitis suspected — alcoholic + confusion + fever — but exclude raised ICP first — CT brain). (f) BROAD-SPECTRUM ANTIBIOTICS (if any suspicion of infection — don't wait — alcoholics deteriorate FAST with sepsis — empiric ceftriaxone + consider MRSA cover [vancomycin] if line infection/cellulitis). (g) LACTATE (if >2 → concerning → >4 → septic shock). (4) RULE: ANY alcoholic with FEVER → assume INFECTION until proven otherwise → investigate (cultures + source) + treat empirically → ADDITIONALLY treat withdrawal (benzo). BOTH can co-exist (withdrawal doesn't protect against infection — and withdrawal-induced immunosuppression may PREDISPOSE to infection). (5) KEY: DTs fever = autonomic hyperactivity BUT ALWAYS exclude SEPSIS first (bloods + cultures + source + empiric antibiotics). Don't attribute fever solely to withdrawal — miss sepsis → death.[4] }Arrhythmia — 'holiday heart.' (1) ALCOHOL + ARRHYTHMIA: (a) 'HOLIDAY HEART SYNDROME': acute alcohol consumption (binge — 'holiday/weekend') → ARRHYTHMIA (AF most common — also atrial flutter, SVT, PVCs) — in a person WITHOUT structural heart disease. (b) MECHANISM: (i) Alcohol → cardiotoxicity (direct — reduces contractility + alters ion channels [Na, K, Ca] → electrical instability). (ii) Alcohol → autonomic dysfunction (sympathetic surge [tachycardia, hypertension] + vagal withdrawal). (iii) Alcohol → ELECTROLYTE DEPLETION (hypokalaemia + hypomagnesaemia → prolonged QT → arrhythmia). (c) Also: ALCOHOL WITHDRAWAL → catecholamine surge → AF (from sympathetic overactivity + atrial irritability). (2) MANAGEMENT: (a) ECG (identify rhythm — AF most common — rate vs rhythm control). (b) ELECTROLYTES (correct K+ + Mg2+ — may resolve arrhythmia). (c) RATE CONTROL (beta-blocker [metoprolol 25-50 mg PO or 5 mg IV] — slows AV node — controls ventricular rate — ALSO reduces sympathetic component of withdrawal → dual benefit). (d) CARDIOVERSION (if haemodynamically unstable — synchronised DC — but usually self-resolves when alcohol metabolised/withdrawal treated). (e) AVOID: digoxin (less effective in acute — and alcoholics may have renal impairment). (3) KEY: alcohol withdrawal → catecholamine surge → AF ('holiday heart') → treat withdrawal (benzo) + rate control (beta-blocker) + correct electrolytes (K + Mg). Usually resolves with withdrawal treatment.[4] }Rhabdomyolysis — from agitation + seizures. (1) MECHANISM: (a) SEVERE agitation (prolonged muscle activity — struggling against restraints — tonic muscle contractions → muscle breakdown → myoglobin release). (b) SEIZURES (generalised tonic-clonic → muscle breakdown — especially if prolonged or recurrent). (c) IMMOBILITY (passed out drunk → 'coma position' → prolonged muscle compression → crush injury → rhabdo — especially if on hard surface [floor] for hours). (2) CONSEQUENCE: (a) CK elevated (marker of muscle breakdown — may be >10,000-100,000 in severe). (b) MYOGLOBINURIA (myoglobin in urine → dark/red-brown urine → 'tea-coloured' → positive for blood on dipstick but NO RBCs [myoglobin cross-reacts] → nephrotoxic [precipitates in renal tubules + free iron + volume depletion] → AKI). (c) ELECTROLYTE derangement (hyperkalaemia [K released from muscle], hyperphosphataemia [PO4 released], hypocalcaemia [Ca binds to damaged muscle]). (3) MANAGEMENT: (a) CHECK CK (baseline + trend — rising = ongoing breakdown — falling = resolving). (b) AGGRESSIVE IV FLUIDS (crystalloid — maintain urine output >200 mL/hr → flush myoglobin through kidneys → prevent AKI). (c) BICARBONATE (alkalinise urine — pH >6.5 → myoglobin more soluble → less precipitation — controversial — but fluids are the mainstay). (d) TREAT CAUSE (control agitation [more benzo], stop seizures [more benzo], relieve compression [reposition]). (e) TREAT HYPERKALAEMIA (calcium gluconate [cardiac protection] + insulin/dextrose [shift K into cells] — avoid calcium if hyperphosphataemia [Ca-PO4 precipitation — but if cardiac toxicity [peaked T, wide QRS] → give calcium]). (f) RRT if severe AKI. (4) KEY: severe agitation + seizures in alcohol withdrawal → rhabdomyolysis → AKI → check CK + aggressive fluids + treat cause.[4] }Antipsychotics (haloperidol) — adjunct only (NOT first-line). (1) RATIONALE for antipsychotics in AWS: some withdrawal patients have SEVERE AGITATION + HALLUCINATIONS that are distressing/uncontrolled → antipsychotic (haloperidol, olanzapine, quetiapine) may help control these symptoms. (2) BUT: antipsychotics are NOT first-line for alcohol withdrawal (and have RISKS): (a) DON'T treat the underlying mechanism (GABA/glutamate imbalance → antipsychotics block dopamine — different pathway → don't address the core withdrawal). (b) LOWER SEIZURE THRESHOLD (antipsychotics → dopamine blockade → reduces seizure threshold → MORE withdrawal seizures — especially haloperidol + phenothiazines [chlorpromazine]). (c) PROLONG QT (haloperidol [IV especially] + olanzapine → QT prolongation → torsades — especially if concurrent hypokalaemia/hypomagnesaemia [common in withdrawal] → additive QT risk). (d) HYPOTENSION (alpha-1 blockade — especially phenothiazines). (3) WHEN TO USE: (a) ADJUNCT (NOT monotherapy) — if hallucinations/agitation distressing and NOT controlled by adequate benzo → ADD haloperidol (1-5 mg PO/IV) to the benzo. (b) ALCOHOLIC HALLUCINOSIS (12-24h — clear sensorium — just hallucinating → antipsychotic may help [unlike DTs — which needs benzo]). (c) Don't use BEFORE benzo (give benzo first → control the withdrawal → THEN add antipsychotic if needed for residual hallucinations/agitation). (4) KEY: antipsychotics (haloperidol) are ADJUNCT ONLY (NOT first-line) — they LOWER SEIZURE THRESHOLD + PROLONG QT → use CAUTIOUSLY → give benzo FIRST → then add antipsychotic if needed. DON'T use antipsychotic monotherapy (seizure risk).[6] }Outcomes + prognosis. (1) MORTALITY: (a) Untreated DTs: 5-15% (from arrhythmia, seizures, aspiration, hyperthermia, fluid/electrolyte derangement, cardiovascular collapse). (b) With treatment (benzo + ICU): 1-5% (markedly reduced). (2) DURATION: (a) Mild withdrawal: 3-7 days (resolves as brain readapts — GABA upregulates + glutamate downregulates — takes days). (b) DTs: 3-7 days at PEAK + 1-2 weeks total (longer recovery — more severe brain adaptation → longer readaptation). (c) POST-withdrawal: anxiety, insomnia, tremor may persist for WEEKS-MONTHS (protracted withdrawal syndrome — brain still readapting — usually resolves). (3) RECURRENCE: (a) If patient RETURNS to drinking → will develop withdrawal again when they stop (each episode may be MORE SEVERE — 'kindling effect' — each withdrawal episode → more brain adaptation → next withdrawal is worse → 'kindling' → progressive sensitisation). (b) PREVENTION: addiction treatment (reduce/stop drinking — AA, counselling, naltrexone, acamprosate, disulfiram). (4) COMORBIDITY: alcoholics often have LIVER DISEASE (cirrhosis — portal HTN, coagulopathy, ascites, encephalopathy — worsens prognosis), MALNUTRITION (thiamine, folate, protein — worsens recovery), PSYCHIATRIC (depression [40%], anxiety [30%], PTSD — need treatment). (5) WERNICKE/KORSAKOFF: if thiamine not given → Wernicke (acute) → Korsakoff (permanent — anterograde amnesia — devastating — institutional care needed). PREVENT with thiamine before glucose. (6) KEY: untreated DTs mortality 5-15% → with treatment (benzo + ICU) 1-5%. Duration 3-14 days. Recurrence if drinking resumes (kindling effect — each withdrawal worse). PREVENT with addiction treatment.[4] }Addiction treatment + prevention. (1) PREVENT RECURRENCE: (a) NALTREXONE (opioid antagonist — reduces alcohol CRAVING + reward [blocks endorphin release from alcohol → less pleasurable] → reduces relapse). Oral 50 mg daily OR monthly IM depot (Vivitrol — compliance). (b) ACAMPROSATE (GABA/glutamate modulator — restores GABA/glutamate balance → reduces withdrawal symptoms/craving long-term → helps maintain abstinence). 666 mg TID (start after detoxification). (c) DISULFIRAM (Antabuse — blocks aldehyde dehydrogenase → if alcohol consumed → acetaldehyde accumulates → flushing, nausea, vomiting, headache, tachycardia → AVERSION therapy — 'you'll be sick if you drink' → requires MOTIVATION [patient must want to avoid the reaction]). (d) NALMEFENE (opioid antagonist — like naltrexone — reduces craving — newer). (2) PSYCHOTHERAPY: (a) COGNITIVE BEHAVIOURAL THERAPY (identify triggers → develop coping strategies → reduce drinking). (b) MOTIVATIONAL INTERVIEWING (enhance motivation to change → reduce ambivalence about stopping). (c) ALCOHOLICS ANONYMOUS (12-step programme — peer support — free — widely available — effective for many). (3) MEDICAL: (a) TREAT LIVER DISEASE (if cirrhosis — hepatology — manage complications [portal HTN, ascites, encephalopathy, varices]). (b) TREAT PSYCHIATRIC COMORBIDITY (depression [SSRI], anxiety [SSRI/buspirone — NOT benzo long-term — addictive]). (c) NUTRITION (thiamine 100 mg daily lifelong + folate + multivitamin + protein — nutritional rehabilitation). (4) HARM REDUCTION (if can't stop drinking): (a) REDUCE intake (fewer units/day → less withdrawal risk). (b) AVOID BINGE (binge → worse withdrawal than steady drinking). (c) REGULAR MEDICAL REVIEW (liver function, nutrition, psychiatric). (5) KEY: alcohol withdrawal is RECURRENT (each episode may be worse — kindling) → PREVENT via addiction treatment (naltrexone/acamprosate + psychotherapy + AA) + treat comorbidities (liver, psychiatric, nutritional).[6] } Red flags
Critical alcohol withdrawal red flags
DTs (48-96h) : confusion + hallucinations + autonomic hyperactivity — mortality 5-15% untreated → ICU.[4] }Benzodiazepines first-line (replace GABA effect) — CIWA-Ar-guided (symptom-triggered) preferred.[6] }THIAMINE BEFORE GLUCOSE (prevent Wernicke → Korsakoff [permanent]).[5] }Withdrawal seizures : treat with BENZOS (NOT phenytoin — ineffective for GABA-mediated withdrawal seizures).[4] }Correct Mg + K + phosphate (all depleted — worsen withdrawal/arrhythmia).[4] }Phenobarbital for refractory (DTs not responding to high-dose benzo).[3] }Exclude SEPSIS (fever may be infection not withdrawal — alcoholics are immunocompromised).[4] }Antipsychotics (haloperidol): adjunct ONLY (NOT monotherapy) — lower seizure threshold + prolong QT.[6] }'Holiday heart' (AF from catecholamine surge) — rate control + correct electrolytes.[4] }Kindling effect : each withdrawal episode may be WORSE → prevent via addiction treatment.[6] } Prognosis
Alcohol withdrawal evidence and outcomes [1]
Densification notes for fellowship revision
This leaf is densified to the ICU fellowship gate standard (CICM / FFICM / EDIC): embedded SAQ practice, multi-figure visual scaffolding, examiner map alignment, and MCQ coverage of definition, mechanism, first-hour management, evidence, and traps.
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Revision checkpoint 1 (1_timeline): Tremor 6–12h.
Revision checkpoint 2 (2_ciwa): 10-item scale.
Revision checkpoint 3 (3_benzo): GABA replacement.
Revision checkpoint 4 (4_dts): Confusion + autonomic storm.
Revision checkpoint 5 (5_wernicke): Confusion, ataxia, ophthalmoplegia.
Revision checkpoint 6 (6_seizures): Benzos not phenytoin.
Revision checkpoint 7 (7_adjuncts): Phenobarbital refractory.
Revision checkpoint 8 (8_electrolytes): Mg, K, phosphate.
Revision checkpoint 9 (9_diff): Sepsis, ICH, hepatic enceph.
Revision checkpoint 10 (10_traps): Glucose before thiamine.
Revision checkpoint 11 (11_evidence): CIWA-Ar validation.
Revision checkpoint 12 (12_icu): Monitor QT if haldol.
Revision checkpoint 13 (13_prognosis): DTs mortality with Rx lower.
Revision checkpoint 14 (14_boards): Timeline table.
Revision checkpoint 15 (15_saq): CIWA plan.
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[1] References [1] Sullivan JT, et al. Assessment of alcohol withdrawal: the revised clinical institute withdrawal assessment for alcohol scale (CIWA-Ar). Br J Addict , 1989.PMID 2597811 [2] Saitz R, et al. Individualized treatment for alcohol withdrawal. A randomized double-blind controlled trial. JAMA , 1994.PMID 8046805 [3] Rosenson J, et al. Phenobarbital for acute alcohol withdrawal: a prospective randomized double-blind placebo-controlled study. J Emerg Med , 2013.PMID 22999778 [4] Grover S, Ghosh A Delirium Tremens: Assessment and Management. J Clin Exp Hepatol , 2018.PMID 30564004 [5] Day E, et al. Thiamine for prevention and treatment of Wernicke-Korsakoff Syndrome in people who abuse alcohol. Cochrane Database Syst Rev , 2013.PMID 23818100 [6] Amato L, et al. Benzodiazepines for alcohol withdrawal. Cochrane Database Syst Rev , 2010.PMID 20238336 
