Management of Altered Mental Status

Initial Assessment and Stabilization

Airway protection is the first priority in patients with altered mental status to prevent aspiration, with transfer to a monitored setting if necessary, as recommended by the American Association for the Study of Liver Diseases 1
Assess mental status severity using validated scales such as the Glasgow Coma Scale to objectively quantify impairment, with a strength of evidence rated as high by the American College of Radiology 2
Decisions regarding intubation should be based on: inability to maintain airway, massive upper GI bleeding, or respiratory distress, according to the American Association for the Study of Liver Diseases 1
For sedation in intubated patients, short-acting medications such as propofol or dexmedetomidine are preferred over benzodiazepines, as recommended by the American Association for the Study of Liver Diseases 1

Investigation of altered mental status should occur concurrently with initial stabilization and empiric treatment, with a comprehensive metabolic laboratory assessment including complete blood count, comprehensive metabolic panel, electrolytes, renal and liver function tests, as recommended by the American College of Radiology 1
Head CT without contrast is usually appropriate as first-line neuroimaging for patients with first episode of altered mental status, focal neurological deficits, seizures, increased risk for intracranial bleeding, or hypertensive emergency, according to the American College of Radiology 3
Brain MRI may be appropriate when CT is negative but clinical suspicion for intracranial pathology remains high, as recommended by the American College of Radiology 4

For hepatic encephalopathy, identify and treat precipitating factors, initiate empiric therapy with lactulose, and consider rifaximin for patients not responding to lactulose alone, as recommended by the American Association for the Study of Liver Diseases 5
Avoid sedating medications such as benzodiazepines and opioids when possible, according to the American Association for the Study of Liver Diseases 1
For suspected intracranial infection, early empiric antimicrobial therapy should be initiated while awaiting diagnostic results, as recommended by the American Thoracic Society 6

In patients with cirrhosis, hepatic encephalopathy is a common cause of altered mental status but remains a diagnosis of exclusion, according to the American Association for the Study of Liver Diseases 1
Routine ammonia level testing is not recommended in patients with cirrhosis and altered mental status, as a normal value calls for diagnostic reevaluation, as recommended by the American Association for the Study of Liver Diseases 5
In elderly patients, delirium is often multifactorial and carries higher mortality, according to the American Geriatrics Society 4

Attributing altered mental status solely to psychiatric causes without adequate medical workup, as warned by the American College of Radiology 4
Relying on ammonia levels alone to diagnose hepatic encephalopathy in cirrhotic patients, as warned by the American Association for the Study of Liver Diseases 5
Delaying empiric treatment while awaiting diagnostic results in potentially life-threatening conditions, as warned by the American College of Radiology 4

For patients with first episode of altered mental status, focal neurological deficits, seizures, increased risk for intracranial bleeding, or hypertensive emergency, head CT without contrast is the first-line imaging, as recommended by the European Society of Cardiology 7
In immunocompromised patients, consider encephalitis even with prolonged history, subtle features, no fever, or normal CSF white cell count, according to the Infectious Diseases Society of America 8

For suspected encephalitis in immunocompromised patients, start intravenous aciclovir (10 mg/kg three times daily) immediately while awaiting diagnostic results, as suggested by the Infectious Diseases Society of America 8
For cardiogenic shock with altered mental status, fluid challenge (saline or ringer lactate >200 mL over 15-30 minutes) as first-line if no overt fluid overload, and consider dobutamine to increase cardiac output if needed, as recommended by the European Society of Cardiology 7

Transfer to ICU if any of the following are present: respiratory rate >25, SaO₂ <90%, use of accessory muscles for breathing, systolic BP <90 mmHg, or signs of hypoperfusion, as recommended by the European Society of Cardiology 7
Standard monitoring should include pulse, respiratory rate, blood pressure, daily weights and accurate fluid balance, as recommended by the European Society of Cardiology 7