In an 85‑year‑old patient with possible dementia presenting with agitation, what psychiatric evaluations and orders should be performed?

Psychiatric Evaluation Orders for an 85-Year-Old with Possible Dementia and Agitation

In an 85-year-old patient with possible dementia presenting with agitation, you should first rule out delirium by screening for reversible medical causes (metabolic derangements, hypoxia, infection, medication effects, pain, constipation, urinary retention) before initiating formal psychiatric evaluation. 1

Initial Assessment Framework

1. Screen for Delirium First (Not Primary Psychiatric Disorder)

The most critical initial step is recognizing that agitation in elderly patients with cognitive impairment is delirium until proven otherwise 2. Order:

• Basic metabolic panel - assess for electrolyte abnormalities, renal dysfunction, hypoglycemia
• Complete blood count - evaluate for infection
• Urinalysis and culture - urinary tract infections are common precipitants
• Chest X-ray - rule out pneumonia/hypoxia
• Oxygen saturation - assess for hypoxia
• Medication review - identify anticholinergics, benzodiazepines, opioids that may cause or worsen delirium 3
• Pain assessment - use validated tools since pain is frequently undertreated and can manifest as agitation 4
• Bowel/bladder assessment - check for constipation or urinary retention 3

2. Cognitive and Functional Assessment

Once medical causes are addressed, perform structured cognitive evaluation 1:

• Bedside mental status examination (e.g., Mini-Mental State Examination, Montreal Cognitive Assessment)
• History from knowledgeable informant - essential for determining baseline function and decline 1
• Functional assessment - determine if cognitive deficits interfere with work or usual activities (distinguishes dementia from MCI) 1

3. Characterize the Agitation Using DESCRIBE Method

Document specific details 4:

• Antecedents - what triggers the behavior (bathing, specific times of day, certain people)
• Behavior specifics - frequency, severity, pattern, timing
• Consequences - impact on patient safety, caregiver distress
• Patient perspective - what can the patient describe about their experience
• Caregiver goal - what outcome matters most to them

Use quantitative measures to track response 5.

4. Assess for Specific Dementia Subtypes and Exclusions

Order additional workup to identify dementia type and rule out mimics 1:

• Thyroid function tests - hypothyroidism can mimic or exacerbate cognitive symptoms
• Vitamin B12 level - deficiency causes reversible cognitive impairment
• Brain imaging (CT or MRI) - identify stroke, subdural hematoma, normal pressure hydrocephalus, tumor
• Screen for depression - major psychiatric disorder must be excluded before diagnosing dementia 1

Look for features that suggest alternative diagnoses:

• Cerebrovascular disease (stroke history, multiple infarcts)
• Lewy body dementia (visual hallucinations, parkinsonism, REM sleep behavior disorder)
• Frontotemporal dementia (prominent behavioral changes, language difficulties)

5. Assess Cognitive Domains Beyond Memory

Evaluate all five domains systematically 1:

1. Memory - repetitive questions, misplacing items, forgetting appointments
2. Executive function - poor judgment, inability to manage finances, safety risks
3. Visuospatial abilities - getting lost, inability to recognize faces/objects
4. Language - word-finding difficulty, speech errors
5. Behavior/personality - mood fluctuations, apathy, loss of empathy, socially inappropriate behaviors

Critical Pitfalls to Avoid

Do not order blood alcohol level and delay psychiatric assessment if the patient is alert, cooperative, has normal vital signs, and appropriate cognition 6. Cognitive function, not a specific blood alcohol concentration, should guide when to begin psychiatric evaluation.

Do not immediately prescribe antipsychotics without first completing the medical workup and attempting nonpharmacological interventions 5. Antipsychotics should only be used when agitation is severe, dangerous, causes significant distress, and nonpharmacological measures have been reviewed 5.

Do not assume agitation equals psychiatric disease - in elderly patients with cognitive impairment, 46-80% have medical illnesses directly causing or exacerbating psychiatric symptoms 6.

When to Consider Pharmacologic Intervention

Only after completing the above assessment and attempting environmental modifications should you consider medications 5:

• Agitation is severe, dangerous, or causes significant patient distress
• Nonpharmacological interventions have been attempted
• Risk-benefit discussion completed with patient (if feasible) and surrogate decision maker
• Start at low doses, titrate to minimum effective dose
• Reassess after 4 weeks - discontinue if no response 5

The evidence strongly supports that assessment and treatment of underlying medical causes takes precedence over psychiatric medication in this population 3, 5, 4.