Immediate Management of Altered Sensorium

Airway and Breathing Assessment

The American College of Emergency Physicians recommends intubating immediately if the Glasgow Coma Scale (GCS) is ≤8 or if the patient shows inability to protect their airway, as this represents the highest priority intervention to prevent aspiration and hypoxic brain injury 1
Assessing respiratory pattern and oxygen saturation is crucial, as abnormal breathing patterns may indicate brainstem dysfunction or metabolic derangement 1

Checking fingerstick glucose immediately before any other intervention is essential, as hypoglycemia is rapidly reversible and can cause permanent neurological damage if untreated 1
Administering thiamine 500mg IV before giving glucose in any patient with malnutrition, alcoholism, or risk factors for deficiency is recommended to prevent precipitating Wernicke encephalopathy 1
If hypoglycemia is confirmed, giving IV dextrose immediately after thiamine is advised 1
Administering naloxone if opioid toxicity is suspected based on pinpoint pupils, respiratory depression, or known substance use history is crucial 1

Documenting temperature, blood pressure, heart rate, and respiratory rate systematically is important, as fever suggests infection, hypotension suggests shock or sepsis, and hypertension may indicate intracranial pathology 1
Quantifying mental status using the Glasgow Coma Scale or FOUR score rather than subjective descriptors like "lethargic" or "confused" is recommended 1
Performing a focused neurological examination specifically looking for focal deficits is essential, as these findings substantially increase the likelihood of a structural brain lesion requiring urgent imaging 1

Obtaining a temporal profile, complete medication list, infectious symptoms, and recent trauma or falls history is crucial in determining the cause of altered sensorium 1, 2
Assessing comorbid conditions such as diabetes, renal failure, liver disease, HIV/AIDS, and malignancy is important in determining the underlying cause of altered sensorium 1, 2

Ordering point-of-care glucose, complete metabolic panel, complete blood count, liver function tests, urinalysis, and toxicology screen is recommended to determine the underlying cause of altered sensorium 1
Checking acetaminophen level when substance use is suspected or history is unclear is essential 1

Obtaining non-contrast head CT immediately if ANY of the following are present: focal neurological deficits, history of head trauma or falls, current anticoagulation use, age >60 with unexplained altered mental status is recommended 1, 2
Considering MRI brain if CT is negative but high clinical suspicion exists for encephalitis, posterior circulation stroke, or inflammatory/autoimmune conditions is advised 1

Performing lumbar puncture when CNS infection is suspected but only after neuroimaging rules out mass effect or increased intracranial pressure is recommended 1
Sending cerebrospinal fluid for cell count with differential, protein, glucose, Gram stain, bacterial culture, and considering viral PCR panel if encephalitis is suspected is essential 1

Starting empiric antibiotics and acyclovir immediately if meningitis or encephalitis cannot be excluded, even before lumbar puncture if there will be any delay in performing it is recommended 1
Using vancomycin plus third-generation cephalosporin for suspected bacterial meningitis and adding ampicillin if age >50 or immunocompromised is advised 1
Adding acyclovir 10mg/kg IV every 8 hours for possible herpes simplex encephalitis is recommended 1

Never attributing altered sensorium to psychiatric causes without completing full medical workup, as organic causes are far more common and missing them can be fatal 1
Considering multiple concurrent etiologies, especially in elderly patients who may have baseline dementia plus acute infection plus medication effect is essential 1
Recognizing that 20-25% of altered sensorium cases are toxicologic/pharmacologic, making medication reconciliation essential 1
Being aware that infective endocarditis presenting with altered sensorium may be due to intracranial mycotic aneurysm, which has 60% mortality and may present with headache, altered sensorium, or focal deficits before catastrophic rupture 3

Assess extra‑ocular movements and look for nystagmus; abnormalities may indicate brainstem or cerebellar involvement. American Academy of Otolaryngology‑Head and Neck Surgery. 4
Evaluate facial symmetry; asymmetry raises suspicion for focal cranial nerve or cortical lesions. American Academy of Otolaryngology‑Head and Neck Surgery. 4
Presence of down‑beating or gaze‑evoked nystagmus is highly suggestive of posterior‑fossa (cerebellar or brainstem) pathology. American Academy of Otolaryngology‑Head and Neck Surgery. 4
Detect focal motor weakness, dysarthria, or hemi‑ataxia; these findings markedly increase the likelihood of an acute stroke or other structural brain lesion. American Academy of Otolaryngology‑Head and Neck Surgery. 4

Inquire about any preceding fluctuating neurological symptoms or prior similar episodes; such a pattern can point toward intermittent or evolving central nervous system processes. American Academy of Otolaryngology‑Head and Neck Surgery. 4

Perform bedside hearing evaluation using Weber and Rinne tuning‑fork tests to screen for sudden sensorineural hearing loss, a finding that may accompany certain neurologic conditions such as posterior‑fossa strokes or inflammatory processes. American Academy of Otolaryngology‑Head and Neck Surgery. 4