ALCOHOLIC KETOACIDOSIS

✓ Medically ReviewedDISEASEID: MDBT0250🚨 TRIAGE: EMERGENCYICD-10: E87.2

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Definition

CLINICAL DEFINITION

Alcoholic ketoacidosis is a high anion gap metabolic acidosis characterised by ketonaemia and ketonuria, typically occurring in patients with chronic alcohol use disorder following a period of binge drinking and subsequent abrupt cessation or reduced intake accompanied by starvation.

IN PLAIN ENGLISH

A dangerous build-up of acids called ketones in the blood, which happens when a person who drinks heavily stops eating and their body starts breaking down fat for energy.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Alcoholic ketoacidosis is NOT diabetic ketoacidosis; it typically presents with low, normal, or only mildly elevated blood glucose levels rather than marked hyperglycaemia. It is also distinct from simple starvation ketosis, which rarely causes a severe acid-base disturbance, and toxic alcohol ingestions, which present with an elevated osmolar gap and specific end-organ toxicity.

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Word Breakdown

ket-

=ketone (from Greek 'aketon' meaning acetone)

-osis

=abnormal condition or process (from Greek '-osis')

Literal Meaning: A condition characterised by the presence of ketones, specifically induced by alcohol metabolism

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Abbreviations

AKA=Alcoholic Ketoacidosis — common clinical abbreviation

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Synonyms & Variants

Alcoholic Ketosis›Alcoholic Acidosis›

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Category-Specific Context

Alcoholic ketoacidosis is an acquired metabolic disease that falls under the broader category of high anion gap metabolic acidoses. It is distinguished from other causes of ketoacidosis (such as diabetic or starvation ketoacidosis) by its specific precipitants, altered redox state in the liver, and characteristic electrolyte derangements.

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Clinical Context & Usage

CLINICAL SETTINGS

Emergency DepartmentIntensive Care UnitMedical Assessment UnitAddiction Medicine Clinic

USAGE & DOCUMENTATION NOTES

Clinicians often document 'AKA' in acute presentations of alcohol use disorder with acidosis. Notes frequently highlight the discrepancy between weakly positive urine ketones (which detect acetoacetate) and severe acidosis, prompting the measurement of serum beta-hydroxybutyrate. Documentation typically includes volume status, electrolyte derangements, and the administration of thiamine and dextrose.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Alcoholic ketoacidosis develops when a patient with chronic alcohol use disorder engages in a binge followed by abrupt cessation, vomiting, and starvation. Poor oral intake depletes hepatic glycogen stores, leading to decreased insulin secretion and increased counter-regulatory hormones (glucagon, cortisol, catecholamines). This hormonal shift stimulates profound lipolysis, releasing free fatty acids that are transported to the liver. Concurrently, the metabolism of ethanol by alcohol dehydrogenase and aldehyde dehydrogenase generates a massive excess of NADH relative to NAD+. This elevated NADH/NAD+ ratio inhibits gluconeogenesis, shifts pyruvate toward lactate, and impairs the Krebs cycle by converting oxaloacetate to malate. As a result, acetyl-CoA is shunted away from the Krebs cycle and into ketogenesis. The high NADH/NAD+ ratio also preferentially reduces acetoacetate to beta-hydroxybutyrate, leading to a high anion gap metabolic acidosis dominated by beta-hydroxybutyrate.

PRIMARY CAUSES

Binge drinking followed by starvation

Heavy ethanol intake followed by abrupt cessation and poor oral intake depletes glycogen, alters the NADH/NAD+ redox state, and triggers unregulated lipolysis and ketogenesis.

Chronic alcohol use disorder with acute intercurrent illness

Conditions such as gastritis, pancreatitis, or infection cause vomiting and anorexia, interrupting nutritional intake in a dependent patient and precipitating the catabolic state required for ketoacidosis.

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Epidemiology

Prevalence:Accounts for up to 20% of ketoacidosis cases in emergency departments, though exact population prevalence is difficult to determine as it is frequently underdiagnosed or misclassified as starvation ketosis or lactic acidosis.

Age Group:Most commonly affects adults aged 20 to 60 years with a history of chronic heavy alcohol use.

Sex Predilection:Male

Geographic Distribution:Globally distributed, correlating with regional patterns of alcohol use disorder and binge drinking behaviours.

Red Flags & Triage ★

TRIAGE LEVEL

🚨 EMERGENCY

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Co-ingestion of toxic alcohols (methanol or ethylene glycol) — must be excluded via osmolar gap and specific toxicology in any patient with unexplained high anion gap metabolic acidosis, as it requires specific antidotes and haemodialysis.
Concurrent sepsis or acute pancreatitis — common precipitants of the starvation state in AKA that carry high mortality if not identified and treated with antibiotics or specific supportive care.

URGENT EVALUATION TRIGGERS

Altered mental status or coma — requires immediate airway protection and evaluation for hypoglycaemia, Wernicke's encephalopathy, or toxic ingestion.
Severe haemodynamic instability or shock — necessitates aggressive fluid resuscitation and vasopressor support.
Profound electrolyte derangements (e.g., potassium < 2.5 mmol/L) — requires immediate cardiac monitoring and cautious intravenous replacement to prevent fatal arrhythmias.

Contraindications & Precautions

CONTRAINDICATIONS

Administering intravenous dextrose without prior or concurrent thiamine — risks precipitating Wernicke's encephalopathy in thiamine-deficient patients.

SPECIAL PRECAUTIONS

Rapid correction of acidosis or overly aggressive fluid resuscitation in patients with underlying alcoholic cardiomyopathy or cirrhosis may precipitate pulmonary oedema.
Potassium and phosphate levels must be closely monitored and replaced cautiously during treatment
as insulin release from dextrose administration drives these electrolytes intracellularly
risking severe arrhythmias or respiratory muscle weakness.

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Wernicke's encephalopathy — precipitated if intravenous dextrose is administered without prior or concurrent thiamine repletion.
Cardiac arrhythmias — driven by severe
often profound
hypokalaemia
hypomagnesaemia
and hypophosphataemia.
Hypoglycaemia — resulting from exhausted hepatic glycogen stores and ethanol-induced inhibition of gluconeogenesis.
Acute kidney injury — secondary to severe volume depletion and hypoperfusion.
Alcohol withdrawal syndrome — including seizures and delirium tremens upon cessation of heavy drinking.

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Diabetic Ketoacidosis

Both present with high anion gap metabolic acidosis and ketonaemia; however, DKA features marked hyperglycaemia, whereas AKA typically presents with low or normal glucose.

Starvation Ketosis

Both involve ketone production due to carbohydrate deprivation, but starvation ketosis rarely causes a bicarbonate level below 18 mEq/L or severe acidemia.

CLINICAL DIFFERENTIAL DIAGNOSES (DDx)

Diabetic Ketoacidosis (DKA)

Key Distinguishing Feature: DKA typically presents with blood glucose > 13.9 mmol/L (> 250 mg/dL), whereas AKA usually features low, normal, or only mildly elevated glucose.

Toxic Alcohol Ingestion (Methanol, Ethylene Glycol)

Key Distinguishing Feature: Toxic alcohols cause a high anion gap metabolic acidosis with a significantly elevated osmolar gap and specific toxicities (e.g., visual disturbances, calcium oxalate crystalluria), without predominant ketonaemia.

Salicylate Toxicity

Key Distinguishing Feature: Presents with a mixed primary respiratory alkalosis and primary high anion gap metabolic acidosis, often with tinnitus and hyperpyrexia, rather than isolated ketoacidosis.

Lactic Acidosis

Key Distinguishing Feature: Characterised by elevated serum lactate rather than predominant ketonaemia, though mild lactic acidosis often coexists in AKA due to hypoperfusion and the altered redox state.

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Clinical Pearls

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Standard urine dipsticks use the nitroprusside reaction, which only detects acetoacetate and not beta-hydroxybutyrate. Because the altered redox state in AKA heavily favours beta-hydroxybutyrate production (ratios up to 10:1), urine ketones may be falsely negative or only weakly positive despite severe ketoacidosis.

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Always administer intravenous thiamine before or concurrently with dextrose. Giving a glucose load to a thiamine-deficient patient accelerates thiamine consumption in the Krebs cycle and can acutely precipitate Wernicke's encephalopathy.

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The anion gap may appear deceptively normal or only mildly elevated if the patient has a concurrent severe hypoalbuminaemia, which lowers the baseline anion gap. Correct the anion gap for albumin to unmask the hidden ketoacidosis.

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Blood glucose in AKA is highly variable; it can be low, normal, or mildly elevated. Do not rule out AKA solely based on the absence of hypoglycaemia or the presence of mild hyperglycaemia.

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Example Usage & SOAP

CLINICAL SENTENCE

"The patient presented with a high anion gap metabolic acidosis and elevated serum beta-hydroxybutyrate following a three-day alcohol binge with minimal oral intake, consistent with alcoholic ketoacidosis."

IN A SOAP NOTE

S: 45-year-old male with history of alcohol use disorder presents with 2 days of severe nausea, vomiting, and abdominal pain after a heavy drinking binge that ended abruptly yesterday. Reports inability to keep food or fluids down. O: Vitals: HR 118 bpm, BP 95/60 mmHg, RR 24/min, SpO2 98% on room air. Dry mucous membranes, decreased skin turgor. Abdomen diffusely tender but soft, no rebound. Labs: pH 7.18, pCO2 18 mmHg, HCO3 7 mEq/L, Anion Gap 26. Glucose 4.8 mmol/L. Serum beta-hydroxybutyrate 6.5 mmol/L. Lactate 2.1 mmol/L. Urine ketones trace. Potassium 3.1 mmol/L, Magnesium 0.6 mmol/L. A: Alcoholic ketoacidosis with severe volume depletion and electrolyte derangements. DKA and toxic alcohol ingestion less likely given glucose and osmolar gap. P: 1. IV Thiamine 500 mg IV stat. 2. D5NS at 150 mL/hr. 3. Aggressive IV potassium and magnesium replacement. 4. CIWA protocol for alcohol withdrawal prophylaxis. 5. Recheck VBG and electrolytes in 4 hours.

DIFFERENTIAL DIAGNOSIS CONTEXT

Differential for high anion gap metabolic acidosis with ketonaemia in a patient with alcohol use disorder: (1) Alcoholic ketoacidosis — suggested by recent binge, starvation, low/normal glucose, and high beta-hydroxybutyrate; (2) Diabetic ketoacidosis — excluded if glucose is normal and HbA1c is not markedly elevated, though can coexist in diabetic patients; (3) Starvation ketosis — typically milder, with bicarbonate rarely < 18 mEq/L; (4) Toxic alcohol ingestion — suspected if osmolar gap is significantly elevated or specific end-organ signs (e.g., visual changes) are present.

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Prognosis

SHORT-TERM OUTCOME

With prompt recognition, volume resuscitation, and appropriate dextrose and electrolyte replacement, the acute acid-base and electrolyte disturbances typically resolve within 24 to 48 hours.

LONG-TERM PROGNOSIS

Long-term prognosis is heavily dependent on the severity of underlying alcohol use disorder and associated end-organ damage (e.g., cirrhosis, cardiomyopathy, neuropathy). Recurrent episodes are common without sustained abstinence or addiction treatment.

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References & Coding

ICD-10 DIAGNOSTIC CODE

E87.2

LITERATURE CITATIONS & GUIDELINES

[1]McGuire LC, Cruickshank AM, Munro PT. Alcoholic ketoacidosis. Emerg Med J. 2006;23(6):417-20.

[2]Long B, Lentz S, Gottlieb M. Alcoholic ketoacidosis: etiologies, evaluation, and management. J Emerg Med. 2021;61(6):658-665.

[3]Wrenn KD, Slovis CM, Minion GE, Rutkowski R. The syndrome of alcoholic ketoacidosis. Am J Med. 1991;91(2):119-28.

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