What are the components of the AEIOU‑TIPS mnemonic for reversible causes of acute altered mental status?

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Last updated: September 10, 2026 • View editorial policy

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AEIOU-TIPS Mnemonic for Reversible Causes of Altered Mental Status

The AEIOU-TIPS mnemonic is a systematic framework used to evaluate potentially reversible causes of acute altered mental status, particularly valuable in emergency and prehospital settings. 1, 2

Breakdown of AEIOU-TIPS Components

A - Alcohol/Acidosis

  • Alcohol intoxication or withdrawal (including delirium tremens)
  • Metabolic acidosis (diabetic ketoacidosis, lactic acidosis, uremic acidosis)
  • Alcohol-related conditions remain among the most common reversible causes in emergency settings

E - Encephalopathy/Electrolytes/Endocrine

  • Hepatic encephalopathy (liver failure)
  • Hypertensive encephalopathy (including posterior reversible encephalopathy syndrome)
  • Wernicke encephalopathy (thiamine deficiency) 1
  • Electrolyte disturbances: hyponatremia, hypernatremia, hypercalcemia
  • Endocrine emergencies: hypoglycemia, hyperglycemia, thyroid storm, myxedema coma, adrenal crisis

I - Insulin (Hypoglycemia/Hyperglycemia)

  • Hypoglycemia - most protocols recommend treating adults at glucose <60 mg/dL 2
  • Hyperglycemic states (diabetic ketoacidosis, hyperosmolar hyperglycemic state)
  • Blood glucose evaluation is universally recommended as a first-line assessment 2

O - Opiates/Overdose

  • Opioid overdose - naloxone administration indicated for signs of opioid toxicity 2
  • Other drug intoxications: anticholinergics, sedatives, narcotics
  • Carbon monoxide poisoning 1
  • Metronidazole toxicity 1

U - Uremia

  • Renal failure with uremic encephalopathy 3
  • Accumulation of metabolic waste products affecting mental status

T - Trauma/Temperature

  • Head trauma (subdural hematoma, epidural hematoma, traumatic brain injury) 1
  • Hypothermia
  • Hyperthermia/heat stroke

I - Infection

  • Most common precipitating factor for delirium 1
  • Urinary tract infections and pneumonia are the leading infectious causes 1
  • Central nervous system infections: meningitis, encephalitis 1
  • Sepsis and systemic infections 1

P - Psychosis/Poisoning

  • New onset psychosis (may have organic causes including temporal lobe lesions, autoimmune disorders) 1
  • Toxic ingestions and poisonings
  • Polypharmacy effects 1

S - Stroke/Seizure/Shock

  • Ischemic stroke and intracranial hemorrhage 4, 1
  • Status epilepticus and nonconvulsive seizures 1
  • Shock states (cardiogenic, hypovolemic, distributive)
  • Acute myocardial infarction 1
  • Hypoxia 1

Clinical Application

Half of EMS agencies (52%) in California incorporate the AEIOU-TIPS mnemonic into their protocols for systematic evaluation of altered mental status 2. This structured approach helps prevent missing life-threatening but reversible causes during the initial assessment.

Critical Pitfalls to Avoid

  • Do not accept "toxic-metabolic encephalopathy" or "delirium" as final diagnoses without systematically excluding specific treatable etiologies 3
  • Two or more coexisting causes frequently occur simultaneously - continue evaluation even after identifying one cause 1
  • Mortality doubles when delirium diagnosis is missed - systematic evaluation is essential 1
  • Intoxicated patients may have concurrent serious pathology - do not attribute all symptoms to intoxication alone 1

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.