Management Altered Mental Status

Altered Mental Status (AMS) – Differential, Workup, and Empiric Therapy

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• Airway/Breathing: O₂ to keep SpO₂ 92–96%; consider early intubation for GCS ≤8, loss of airway reflexes, or refractory hypoventilation.
• Circulation: Cardiac monitor, IV access ×2, treat hypotension (balanced crystalloids; vasopressors if needed).
• Check glucose immediately; if <70 mg/dL → D50W 25 g IV (or D10W infusion). Give thiamine 100 mg IV first if malnourished/alcohol use.
• Consider naloxone for suspected opioid toxicity: 0.04–0.4 mg IV q2 min, titrate up to 2 mg (repeat/infuse for long-acting opioids).
• Temperature control: treat hyper/hypothermia.
• 12-lead ECG; treat dysrhythmias promptly.

Dextrose Thiamine Naloxone Airway Fluids/Pressors

Toxicologic / Iatrogenic

• Opioids, benzodiazepines, alcohols, stimulants, gabapentinoids
• Polypharmacy, sedative overdose, anticholinergics, TCAs
• Withdrawal (benzos, alcohol, opioids)

Infectious

• Sepsis, meningitis, encephalitis
• Pneumonia, UTI/pyelo, skin/soft tissue infection

Endocrine/Metabolic

• Hypo/hyperglycemia, HHS/DKA
• Electrolytes (Na, Ca, Mg), uremia, hepatic failure/hyperammonemia
• Thyroid/adrenal crisis

Neurologic

• Stroke/ICH/SAH, seizure/post-ictal, NCSE
• Traumatic brain injury
• Brain tumor, hydrocephalus

Respiratory/Circulatory

• Hypercapnia/hypoxemia, CO poisoning
• Shock (septic, cardiogenic, hypovolemic, distributive)

Environmental/Psych

• Heat/cold exposure
• Primary psychiatric (diagnosis of exclusion)

Bedside / Initial

• POC glucose; vitals incl. temp
• ABG/VBG (ventilation/CO₂, oxygenation)
• Focused neuro exam; pupillary response

Core Labs

• CBC, CMP, Mg/Phos, LFTs
• Lactate, CK, troponin (if indicated)
• Ammonia (encephalopathy), TSH ± free T4
• Pregnancy test (β-hCG) in women of childbearing age
• UA/urine culture; blood cultures if infection suspected

Toxicology

• Serum acetaminophen & salicylate levels
• Ethanol level
• UDS (screen); consider serum osmol gap for toxic alcohols
• Carboxyhemoglobin if CO exposure possible

Imaging

• Non-contrast CT head (rapid screen for ICH/large stroke)
• CXR (aspiration, pneumonia, edema; ETT confirmation if intubated)
• MRI brain if encephalitis/early stroke suspected after CT

When to Perform Lumbar Puncture

• Suspected meningitis/encephalitis: LP for cell count, protein, glucose, Gram stain/culture, HSV PCR.
• Head CT before LP if focal deficits, papilledema, immunocompromised, new seizures, or concern for mass effect.

Scenario	Key Actions & Empirics
Suspected Opioid Toxicity	Airway/ventilation support; Naloxone 0.04–0.4 mg IV, titrate up to 2 mg; repeat or start infusion for long-acting opioids. Avoid deep sedation unless necessary.
Benzodiazepine Overdose	Supportive care, airway protection as needed. Avoid flumazenil unless known isolated benzo ingestion with no seizure risk or co-ingestants.
Unknown/Poly-Overdose (early)	Consider activated charcoal 1 g/kg (max 50 g) within 1–2 h if protected airway. Obtain tox levels (APAP/salicylate). Poison control/toxicology consult.
Acetaminophen Ingestion	Start N-acetylcysteine (IV 3-bag: 150 mg/kg → 50 mg/kg → 100 mg/kg) while clarifying timeline; adjust per nomogram/levels.
Tricyclic / Na⁺ Channel Blocker	If wide QRS, hypotension, or arrhythmias → Sodium bicarbonate 1–2 mEq/kg IV bolus; repeat/titrate; consider infusion.
Possible Meningitis (Adult)	Draw blood cultures → Dexamethasone 10 mg IV → Ceftriaxone 2 g IV q12h + Vancomycin; add Ampicillin 2 g IV q4h if age >50 or immunocompromised; add Acyclovir 10 mg/kg IV q8h if encephalitis suspected. Do not delay antibiotics for imaging/LP if unstable.
Sepsis (no clear source)	Sepsis bundle: fluids (30 mL/kg balanced crystalloids if hypotensive or lactate ≥4), norepinephrine to MAP ≥65 if needed, cultures before antibiotics when feasible, lactate now & recheck. Empiric: Piperacillin-tazobactam or Cefepime ± metronidazole; add Vancomycin for MRSA risk. Tailor to local antibiogram.
HSV Encephalitis Suspected	Start Acyclovir 10 mg/kg IV q8h promptly (renal dose adjust), obtain HSV PCR on CSF.
Hyperammonemia / Hepatic Encephalopathy	Lactulose titrated to 2–3 soft BMs/day; consider Rifaximin; search for precipitant (GI bleed, infection, meds).
Alcohol Withdrawal / Wernicke Risk	Thiamine 100 mg IV before glucose; symptom-triggered benzodiazepines (CIWA-Ar); consider phenobarbital adjunct per protocol.

Doses are typical adult starting points and require renal/hepatic adjustment and local protocol alignment.

• Sepsis: Suspected/documented infection plus acute ↑ in SOFA ≥2.
• Septic shock: Sepsis + vasopressors to keep MAP ≥65 and lactate >2 mmol/L despite fluids.
• qSOFA (screen): RR ≥22, SBP ≤100, altered mentation (≥2 → high risk).

• Initial vent: Vt 6–8 mL/kg PBW, RR to target pH 7.30–7.45, PEEP 5–10 cmH₂O, FiO₂ to SpO₂ 92–96%.
• ETT: Confirm with waveform capnography; CXR: tip ~3–5 cm above carina; depth ~21 cm (women) / 23 cm (men) at teeth.
• Sedation: Analgesia-first; propofol or dexmedetomidine preferred; avoid deep benzodiazepine sedation unless indicated. Daily SAT/SBT.

• Airway threat, hypoventilation, refractory hypoxemia
• Focal neuro deficits, thunderclap headache, meningismus
• Severe hypotension/shock, fever with neck stiffness/photophobia
• Wide-QRS dysrhythmias, seizures/status epilepticus, NCSE concern