Differential Diagnosis for Altered Mental Status in an Elderly Hypertensive Woman

Priority Life-Threatening Etiologies to Rule Out

• Hypoglycemia and hyperglycemia are among the most common reversible causes requiring immediate point-of-care testing, according to the American College of Radiology 1
• Hypoxia from respiratory causes must be assessed immediately, as recommended by the American College of Radiology 1
• Hypothermia can precipitate delirium, as noted by the American College of Radiology 1
• Acute myocardial infarction can present atypically with altered mental status in elderly women without chest pain, as reported by the American College of Radiology 1
• Hypertensive emergency with end-organ dysfunction affecting cerebral perfusion is a concern, according to the American Heart Association 2

Drug-Related Causes

• Polypharmacy is a major contributor to delirium in the elderly, as stated by the American College of Radiology 1
• Anticholinergic medications, sedatives, and narcotics are common precipitants, as reported by the American College of Radiology 1
• Drug or alcohol withdrawal must be considered even without obvious intoxication, as noted by the American College of Radiology 1

Intracranial Pathology Despite "No Stroke"

• Intracranial hemorrhage (ICH) remains possible, as higher systolic blood pressure is significantly associated with abnormal brain imaging in elderly patients with altered mental status, according to the American College of Radiology 3
• Nonconvulsive seizures require EEG evaluation, not just imaging, as recommended by the American College of Radiology 1
• Subdural hematoma from unrecognized trauma, especially in elderly patients on anticoagulation, is a concern, as reported by the American College of Radiology 3

Chronic Hypertension-Related Cognitive Changes

• Chronic hypertension causes narrowing and sclerosis of small penetrating arteries leading to hypoperfusion, loss of autoregulation, and subcortical white matter demyelination, as stated by the American Heart Association 2
• Mild cognitive impairment (MCI) represents a transitional state where patients show poor recent memory but can still perform daily tasks, according to the American Heart Association 2

Systematic Evaluation Approach

• Fingerstick glucose to rule out hypoglycemia/hyperglycemia is recommended by the American College of Radiology 1
• Vital signs including orthostatic measurements in all hypertensive patients over 50 years are recommended by the American Heart Association 2
• Oxygen saturation to assess for hypoxia is recommended by the American College of Radiology 1
• Core temperature to identify hypothermia is recommended by the American College of Radiology 1

Laboratory Evaluation

• Comprehensive metabolic panel focusing on sodium, glucose, renal function, and calcium is recommended by the American College of Radiology 1
• Complete blood count to assess for anemia or infection is recommended by the American College of Emergency Physicians 4
• Thyroid function in elderly patients with new psychiatric symptoms is recommended by the American College of Emergency Physicians 4
• Toxicology screen including alcohol level, as substance abuse has 92% sensitivity when self-reported but requires objective testing, is recommended by the American College of Emergency Physicians 4

Cardiac Evaluation

• Electrocardiogram to assess for myocardial ischemia, which can present atypically in elderly women, is recommended by the American College of Radiology 1

Neuroimaging Considerations

• Non-contrast head CT is the initial imaging modality for suspected intracranial pathology, as recommended by the American College of Radiology 3
• Imaging is usually appropriate when there is suspected intracranial pathology, focal neurologic deficit, lower Glasgow Coma Scale, or significantly elevated blood pressure, as stated by the American College of Radiology 3

Critical Pitfalls to Avoid

• Do not assume "no stroke" without proper vascular imaging, as small vessel disease and lacunar infarcts may not present with obvious focal deficits, as noted by the American Heart Association 5
• Do not overlook medication reconciliation, as elderly patients often take multiple medications that interact or accumulate, as recommended by the American College of Radiology 1
• Do not miss orthostatic hypotension by only measuring seated blood pressure—obtain lying and standing measurements, as recommended by the American Heart Association 2
• Do not forget non-convulsive seizures, which require EEG rather than imaging for diagnosis, as noted by the American College of Radiology 1

Special Considerations in Elderly Hypertensive Women

• Four factors strongly associated with ED delirium are particularly relevant: nursing home residence, cognitive impairment, hearing impairment, and history of stroke, as reported by the American College of Radiology 3
• Elderly women with hypertension are at particularly high risk for cerebrovascular complications and cognitive decline, with nearly 1 in 3 adult women having hypertension and 1 in 5 deaths being hypertension-related, as stated by the American College of Cardiology 6, 7

Altered Mental Status in Elderly Patients Associated with Nitrofurantoin

Introduction to Altered Mental Status

• Altered mental status is a common emergency department presentation, accounting for 4-10% of chief complaints, with significantly higher mortality in elderly patients, according to the American College of Radiology 8, 9, 10
• The American College of Radiology identifies drugs and intoxication as major triggers for acute mental status changes that occur over minutes to days 8, 10

Clinical Features and Evaluation

• Medications, including antibiotics like nitrofurantoin, are among the most common precipitating factors for acute mental status changes in elderly patients, as noted by the American College of Radiology 8, 9, 10
• Assessing for fluctuating course throughout the day is crucial, as delirium characteristically waxes and wanes, and can be evaluated using the Confusion Assessment Method (CAM) or its variants 8, 9, 10

Management and Outcomes

• Delirium is a medical emergency with mortality rates twice as high when the diagnosis is missed, emphasizing the need for early recognition and prompt management, including discontinuation of potentially neurotoxic medications like nitrofurantoin 8, 9, 10
• Implementing non-pharmacological delirium management strategies while addressing the underlying cause is recommended, according to the American College of Radiology 8, 9, 10