By Aislinn Ozawa Burns, MSN, PMHNP-BC
A patient who has forgotten appointments for a year is different from a patient who cannot follow a conversation this afternoon. Both need assessment. The second presentation changes the urgency.
The PMHNP Playbook starts with a useful distinction: acute, fluctuating confusion suggests delirium; longer-term cognitive decline raises concern for dementia. The next step is to ask what changed from this patient’s baseline and what must happen now.
Independent educational content for PMHNP board preparation, not individualized medical advice. All cases are fictional and original; these are not official ANCC questions. This resource is not affiliated with or endorsed by ANCC and does not guarantee exam results. Suspected delirium requires urgent clinical assessment.
Start With Change, Not Age
Delirium is a syndrome of acute brain dysfunction. The book emphasizes hours to days, an uneven course, and impaired attention. A dementia diagnosis describes a different problem: acquired cognitive decline that interferes with independent daily functioning. Dementia is not normal aging, and memory is only one possible affected domain. The National Institute on Aging also describes difficulties with language, judgment, behavior, and everyday activities.
Ask two separate questions: What has been happening over months or years? What is different today? A person can have both dementia and delirium. The long-standing diagnosis does not explain away a new inability to stay awake, engage, or follow instructions.
Attention Is More Useful Than “Confused”
“Confused” is a starting description, not a complete examination. Can the person stay with a question? Do they lose the thread after a few words? Are they unusually drowsy or distractible? Pair your observations with the mental status exam and a history of what the patient could do before this change.
Delirium is not always noisy. Hypoactive delirium can look like sleepiness, slowed responses, withdrawal, or reduced activity. An unusually quiet patient may need the same urgent attention as a patient pulling at equipment. NICE’s delirium guidance specifically warns that this presentation is easy to miss.
Collateral history matters. Ask a family member, caregiver, or staff member who knows the patient: “When were they last behaving like themselves? Could they follow a conversation yesterday? What changed in sleep, intake, medication, or daily function?” A normal-looking moment during your visit does not erase a documented fluctuating course.
Choose the First Action Before the Final Label
When the change is acute, prioritize prompt medical evaluation rather than routine memory testing or an automatic psychiatric admission. Assess immediate stability, vital signs, oxygenation and glucose as appropriate to the setting, and arrange urgent medical or emergency evaluation. An unstable patient, a new focal neurologic deficit, seizure, or markedly reduced consciousness requires emergency response.
Then look for contributors together: medication changes and nonprescription products, intoxication or withdrawal, dehydration, metabolic problems, pain, infection, and other acute illness. More than one cause may be present. The clinical interview and medication timeline should include what was started, stopped, missed, or increased.
Clinical nuance: a positive urine result is not the whole explanation. The book highlights UTI as a possible trigger. Infection belongs in the differential, but confusion alone does not establish a urinary infection. For an older patient with delirium and bacteriuria but no local urinary symptoms or systemic infection signs, IDSA recommends assessing other causes and careful observation rather than automatically prescribing antibiotics. Fever, instability, or suspected sepsis changes the assessment and requires urgent care.
Use a Tool to Support the Assessment
A cognitive score cannot tell you, by itself, why a patient is struggling. A low MoCA or MMSE during acute illness should not become an immediate permanent dementia label.
The 4AT assesses alertness, brief orientation, attention, and acute change or fluctuation. Its official user guide explains how to score it and handle patients who cannot complete testing. A score of 4 or more suggests possible delirium, with or without cognitive impairment; clinical assessment is still required. A score of 0 does not completely exclude delirium.
NICE recommends the 4AT when delirium indicators are present in its general hospital and long-term-care pathway; critical care and post-anesthesia recovery use CAM-ICU or ICDSC instead. Follow your setting’s validated pathway. Do not wait for a screening score before stabilizing an unwell patient.
Treat the Cause and Protect the Patient
The book’s central treatment principle holds: identify and address the underlying problem. Support care with a calm environment, gentle orientation, familiar people when possible, glasses and hearing aids, hydration and nutrition when safe, appropriate mobility, pain assessment, and protection of sleep. Explain what is happening rather than arguing with the patient’s experience.
Medication for agitation is a separate decision from treatment of the delirium itself. Begin with de-escalation when feasible; severe distress or danger may require a carefully selected short-term medication in a monitored clinical setting.
Clinical nuance: haloperidol is not a universally safest choice. Low anticholinergic burden does not cancel neurologic or cardiac risk. The U.S. label contraindicates use in Parkinson’s disease and warns about QT prolongation and increased mortality in older adults with dementia-related psychosis. MHRA guidance also contraindicates haloperidol in Lewy-body dementia and calls for ECG/electrolyte review, the lowest appropriate dose, and the shortest necessary duration. Do not use “agitated” as a shortcut around these checks.
Keep the book’s withdrawal exception in context. Benzodiazepines are generally avoided as routine sedation for non-withdrawal delirium, but ASAM recommends them as first-line treatment for alcohol-withdrawal delirium with close monitoring. Antipsychotic monotherapy does not adequately treat that withdrawal syndrome. Suspected severe alcohol or benzodiazepine withdrawal requires urgent supervised care.
Put the Pattern to Work
A quiet change
A nursing-facility resident usually joins breakfast and follows group conversation. Today they keep falling asleep, eat little, and cannot stay with a question. “At least they are not agitated” is the wrong reassurance. The change from baseline and poor attention warrant urgent assessment for hypoactive delirium.
A chronic problem with a new layer
A patient with established dementia usually needs help with bills but can dress and converse. A sudden loss of those abilities after an illness needs a fresh assessment. The useful comparison is with this patient’s usual function, not with a cognitively healthy peer.
Try all 10 delirium vs. dementia practice questions. Choose an answer before expanding its rationale, then explain why each alternative is less appropriate.
Frequently Asked Questions
Can dementia fluctuate too?
Yes. The book highlights fluctuation in Lewy-body dementia. Time course alone is not a complete diagnosis. Look for a new departure from the person’s established pattern and assess acute contributors.
Does delirium always resolve quickly?
No. Improvement can lag behind treatment of a trigger. Persistent symptoms require reassessment, follow-up, and consideration of underlying cognitive impairment; do not promise immediate or complete recovery.
Can depression affect cognition?
Yes. Depression can contribute to memory and concentration complaints and can coexist with dementia. Neither “I don’t know” answers nor a single cognitive score establishes the diagnosis. Assess mood, function, medical factors, and the longitudinal history.
What is the best way to reason through a clinical question?
Name the acute change, identify the safety priority, and separate the cause-directed plan from symptom control. Use the details given rather than choosing a familiar medication or test automatically.
The PMHNP Playbook Takeaway
Baseline first. Acute change next. Safety before a final label. The book gives you the recognition pattern; clinical reasoning tells you how to use it without anchoring on age, a urine result, or a chronic diagnosis.
Continue with the screening-tool interpretation guide and the serotonin syndrome vs. NMS guide for another example of separating recognition from the first action.
Sources and Further Reading
- NICE CG103: delirium recommendations
- IDSA: asymptomatic bacteriuria guideline
- MHRA: haloperidol safety in older adults with delirium
- U.S. haloperidol prescribing information
- 4AT: clinical user guide
- National Institute on Aging: what is dementia?
- ASAM Clinical Practice Guideline on Alcohol Withdrawal Management
Sources checked October 21, 2026. Apply current local protocols, product-specific labeling, and the patient’s clinical context.
Keep the Big Picture in Reach
The PMHNP Playbook gives you a concise foundation to connect with the reasoning in this guide.
