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Nervous

Alzheimer’s, Delirium & Dementia

Verified · Sep 2026

Dementia (major neurocognitive disorder) is a persistent, progressive decline in one or more cognitive domains severe enough to impair daily function — Alzheimer disease is its most common cause — whereas delirium is an acute, fluctuating disturbance of attention and awareness caused by an underlying medical condition, drug, or withdrawal.

The disorder behind the CAM screen, the months-backward test, the anticholinergic med review, the HELP bundle, the never-restrain rule, the sundowning routine, the wandering bracelet, and the reason a "positive UA" in a confused 84-year-old is not automatically a UTI.

What’s going wrong in the body

The normal physiology, where it fails, and why the body’s compensation backfires.

01 Delirium — a vulnerable brain meets an insult

Delirium is defined (DSM-5, as carried by StatPearls) as "a disturbance in attention and awareness that develops acutely and fluctuates in severity", with at least one additional cognitive disturbance, not better explained by pre-existing dementia, not occurring in coma, and with evidence that it is caused by a medical condition, substance intoxication, withdrawal, or a toxin. That last clause is the whole clinical program: delirium is a symptom of something else, and the something else is what you treat.

Two mechanistic chains run in parallel. The neurotransmitter chain: delirium is associated with decreased cholinergic activity and increased dopaminergic activity — the two pathways overlap and their balance is vital to attention, which is why anticholinergic drugs are such reliable precipitants. The neuroinflammation chain: a peripheral insult such as infection or surgery releases cytokines (IL-6, TNF-α, IL-1β) that disrupt the blood–brain-barrier endothelium, raising permeability; CNS inflammation, microglial activation, ischemia and neuronal death follow, and attention and arousal fail. Newer framing treats delirium as a disorder of brain connectivity — frontoparietal and thalamocortical circuits drop out — with oxidative stress, circadian/melatonin disruption and the glucocorticoid stress response feeding the loop.

Why does an 84-year-old with dementia become delirious from a bladder catheter while a 40-year-old shrugs off pneumonia? The vulnerability × insult model: predisposing factors (age > 70, dementia, sensory loss, frailty, malnutrition, multimorbidity) reduce cognitive reserve, so a minor stressor — a minor procedure, catheterization — is enough to tip a highly vulnerable brain. In a resilient brain it takes a major insult. Dementia confers a 3–4-fold delirium risk, and roughly half of hospitalized people with dementia develop delirium superimposed on it.

Delirium as vulnerability × insult: a low-reserve brain plus a peripheral trigger produces neuroinflammation and cholinergic–dopaminergic imbalance, network failure, and the fluctuating inattention that defines the syndrome.

02 Alzheimer disease — amyloid is the trigger, tau is the bullet

Alzheimer disease (AD) is a neurodegenerative condition of insidious onset and progressive impairment of memory, comprehension, language, attention, reasoning and judgment — and episodic short-term memory loss is the initial and most common presenting symptom, with long-term memory relatively spared. It is the most common form of dementia, accounting for roughly 60–80% of cases. Brain changes begin about two decades before symptoms; the preclinical stage is asymptomatic but already shows biomarker evidence (low CSF Aβ42, raised tau).

The amyloid chain: amyloid precursor protein (APP) is cleaved sequentially by β- and γ-secretase into the 42-amino-acid peptide Aβ42; rising Aβ42 aggregates, is toxic to neurons, and deposits as extracellular neuritic plaques — a core of amyloid surrounded by enlarged axonal endings. The tau chain: aggregated amyloid drives tau hyperphosphorylation; tau misfolds into twisted paired helical filaments and forms intracellular neurofibrillary tangles that first appear in the hippocampus, then spread to the cerebral cortex. StatPearls’ framing: amyloid is the trigger that initiates the disease, tau in the form of tangles is the bullet that produces neurodegeneration. Severity tracks tangles and synapse loss, not plaques — plaques can be found in cognitively normal people.

Two more chains explain the symptoms and the drugs. The cholinergic chain: neuronal loss in the nucleus basalis of Meynert reduces acetylcholine, and β-amyloid itself causes cholinergic synaptic loss and impaired ACh release — memory and learning fail, and this deficit is the entire rationale for cholinesterase inhibitors. The anatomy chain: neuronal death begins in the entorhinal cortex of the hippocampus, producing hippocampal and medial temporal atrophy, widened sulci and dilated lateral ventricles as the cortex thins. Genetics loads the gun: APOE ε4 roughly triples risk in heterozygotes and raises it about 15-fold in homozygotes (the most important sporadic risk factor); rare autosomal-dominant APP, PSEN1, PSEN2 mutations cause early-onset disease; and Down syndrome (an extra APP copy on chromosome 21) puts nearly 100% of people on the AD-pathology path.

The Alzheimer cascade: secretase cleavage of APP yields Aβ42 plaques, which trigger tau tangles that spread from the hippocampus outward; parallel cholinergic loss produces the memory failure that cholinesterase inhibitors partially offset.

03 Delirium versus dementia — the differentiation exams live on

Dementia is defined (DSM-5, via StatPearls) as a significant decline in at least one cognitive domain — executive function, complex attention, language, learning and memory, perceptual-motor, or social cognition — that is a change from baseline, is persistent and progressive, does not occur exclusively during delirium, and impairs everyday function (IADLs such as finances and medications, then ADLs such as grooming and feeding). Functional decline is not optional: no cognitive test alone diagnoses dementia. Mild cognitive impairment (MCI) is the step before — more memory trouble than peers without daily-life disruption; not everyone progresses, but roughly 10% per year do.

Set the two side by side, cell by cell as sourced. Onset: delirium acute, over hours to days; dementia insidious, over months to years. Course: delirium fluctuates within a day; dementia is progressive and, in the patient-page words, "almost never gets better." Attention: disturbed in delirium — it is the core deficit; relatively preserved early in dementia, where memory is the prominent deficit. Consciousness: altered in delirium (hypervigilant, drowsy, stuporous); normal wakefulness in dementia. Speech/thinking: incoherent, disorganized speech in delirium; word-finding trouble and anomia progressing over years to muteness in dementia. Perception: visual and tactile hallucinations common and fluctuating in delirium; subtype-dependent in dementia (rare early in AD, delusions in 20–40% of moderate AD, core visual hallucinations in Lewy body disease). Duration/reversibility: delirium variable and potentially reversible; dementia chronic and irreversible except the treatable mimics (normal pressure hydrocephalus, B12 deficiency, thyroid disease, syphilis, depression). EEG: generalized slowing in delirium versus an atrophy pattern in dementia.

The combination is the ward reality: delirium superimposed on dementia carries a pooled in-hospital prevalence near 49%, is missed by clinical teams in 60–72% of cases, and is a two-way street — dementia precipitates delirium, and delirium independently raises later dementia risk and accelerates decline in AD, sometimes for more than five years. So the single most important nursing habit on this page is to know the baseline from family or caregivers and treat any acute change from it as delirium — a medical problem to work up — not as "her dementia getting worse."

The delirium-superimposed-on-dementia cycle: low reserve makes delirium easy to trigger, delirium worsens the dementia, and multicomponent prevention (HELP-type bundles, Cochrane 2021 RR 0.57) is the lever that breaks it.

04 The other dementias — and why behavior is physiology too

DSM-5 lists 13 etiologic subtypes, and mixed pathology is common. Vascular dementia (≈ 15–20% of clinical diagnoses) results from ischemia or hemorrhage, not a proteinopathy: large-artery infarcts produce the classic stepwise decline, hypertensive arteriolosclerosis produces lacunes and microbleeds, and focal signs (hemiparesis, field cuts, gait failure) travel with the cognitive loss. Lewy body dementia — one of the most common dementias after AD and vascular — is α-synuclein misfolding with a cholinergic deficit more pronounced than in AD: fluctuating cognition and alertness, recurrent well-formed visual hallucinations, REM sleep behavior disorder, parkinsonism, early orthostatic hypotension and falls, and severe sensitivity to antipsychotics. Its fluctuations mimic delirium; the parkinsonism, dysautonomia and gradual onset separate them. By the 1-year rule, dementia first or within a year of the movement disorder is dementia with Lewy bodies; Parkinson disease ≥ 12 months earlier is Parkinson disease dementia. Frontotemporal dementia (mean presentation age 58, the second most common cause under 65) deposits TDP-43 or tau in the frontal and anterior temporal lobes: disinhibition, apathy, loss of empathy, compulsions, hyperorality — with memory intact early, so it is often mistaken for a psychiatric disorder. Cholinesterase inhibitors have no proven benefit in FTD.

Behavioral and psychological symptoms of dementia (BPSD) — delusions, hallucinations, apathy, anxiety, depression, disinhibition, agitation, wandering, sleep and appetite change — affect up to 97% of community-dwelling people with dementia at some point. They are not "bad behavior"; they are physiology plus unmet need. Sundowning, increased confusion and agitation from dusk through night in up to two-thirds of patients, is tied to degeneration of the suprachiasmatic nucleus, reduced melatonin and circadian disruption, amplified by fatigue, low light and shadows, reversed sleep and caregiver stress — and when it is new, think superimposed delirium. Agitation and aggression cluster around unmet needs (food, fluid, companionship), a mismatch between caregiver expectation and capability, and above all intimate care such as bathing, the primary precipitant of aggression. Pain is present in 46–56% of people with dementia, yet only 20–40% receive analgesics versus 60–80% of comparable people without dementia — the person who cannot say "it hurts" hits instead.

Causes & risk factors

Modifiable factors are teaching targets — the patient can act on them.

Increasing age — the most important AD risk factor; incidence doubles every 5 years after 65, and roughly a third or more of people 85 and older have AD Genetics — APOE ε4 (≈ 3× heterozygous, ≈ 15× homozygous); autosomal-dominant APP, PSEN1, PSEN2 in early-onset families; Down syndrome; first-degree relative with AD Cardiovascular risk — hypertension, mid-life obesity, type 2 diabetes, hyperlipidemia, atrial fibrillation (AD and vascular dementia) modifiable Smoking, physical inactivity, hearing loss left uncorrected — protective: education, aerobic exercise, cognitive and social activity, Mediterranean/DASH-style diet modifiable Traumatic brain injury (raises dementia risk nearly 70%) modifiable Delirium vulnerability — age > 70, existing dementia or MCI, poor vision or hearing, frailty, malnutrition, multimorbidity, functional disability Deliriogenic medications — anticholinergics, benzodiazepines, opioids (meperidine), antihistamines (diphenhydramine), corticosteroids, sedatives, polypharmacy; up to 39% of delirium is medication-related (review against AGS Beers 2023) modifiable Infection — UTI, pneumonia, sepsis, meningitis/encephalitis, influenza modifiable Hypoxia, hypo-/hyperglycemia, hyponatremia, hypercalcemia, dehydration, renal or hepatic failure, thyroid dysfunction, decompensated heart failure modifiable Untreated pain, constipation, urinary retention, sleep deprivation, sensory deprivation (no glasses or hearing aids) modifiable Surgery and anesthesia (deep > light sedation), ICU stay, mechanical ventilation, immobility, tethers (catheters, IV lines), restraints, unfamiliar environment modifiable Alcohol or benzodiazepine withdrawal; substance intoxication modifiable

Signs & symptoms

Each finding tied to the mechanism that produces it — and the triage it calls for.

Acute, fluctuating change in mental status from baseline — worse at night Report immediately
Why: The defining feature of delirium: network function waxes and wanes as the inflammatory and neurotransmitter insult fluctuates. A new or rapid change in mental status is reported immediately — delirium "requires urgent evaluation," and nurses are often the first to detect it.
Inattention — cannot recite months backward or follow a conversation Report immediately
Why: Attention is the core deficit of delirium and the thing that separates it from dementia, where attention is relatively preserved early. Disorganized thinking, hallucinations or difficulty maintaining consciousness are delirium signs unless proven otherwise.
Hypoactive delirium — somnolent, withdrawn, "sleeping more," "not eating," mistaken for fatigue or depression Report immediately
Why: Decreased arousal from the same network failure. It is the most commonly missed form (in one study only 21% of nursing staff recognized it) and carries the highest morbidity and mortality — quiet is not the same as fine.
Hyperactive delirium — agitation, sympathetic activation, hallucinations, pulling at lines, combativeness Report immediately
Why: Dopamine excess and cholinergic depletion drive arousal and perceptual disturbance; easier to detect because the patient is agitated. In the ICU the mixed form, fluctuating between the two, is the most frequent.
Anticholinergic toxidrome — dry mouth and skin, flushed, dilated pupils, tachycardia, urinary retention, constipation, plus confusion Hold & notify
Why: "Mad as a hatter, blind as a bat, dry as a bone, hot as a hare, full as a flask" — older adults are at the highest risk, and more than 600 products have anticholinergic activity. The cluster points straight at the medication list.
Repeating questions, forgetting recent conversations, misplacing items, trouble with finances and driving — mild (early) AD early
Why: Hippocampal and entorhinal damage impairs encoding of new episodic memory first; executive and judgment deficits follow, so IADLs (checkbook, cooking, driving) fail while the person may still live independently.
Needs help bathing and dressing, confused about time and place, delusions, wandering, sundowning — moderate (middle) AD Expected
Why: Language and visuospatial cortex are now involved and basic ADLs fail; delusions occur in about 20–40% and disruptive behaviors in almost half. Typically the longest stage, lasting many years. New agitation still gets a delirium and pain check first.
Cannot recognize family, mute or near-mute, incontinent, dysphagia, bedbound — severe (late) AD late Hold & notify
Why: Global cortical loss removes language, self-care and gait; primitive reflexes reappear. Swallowing failure plus immobility sets up aspiration pneumonia, pressure injuries and clots — coughing or choking with meals is a report-now finding.
Grimacing, guarding, moaning, striking out during care — pain expressed as behavior Hold & notify
Why: Verbal report fails as language fails, so pain surfaces as agitation; intimate care is the primary precipitant of aggression. Use an observational tool (PAINAD) rather than assuming "behavior."
Increased confusion and restlessness from dusk into the night — sundowning Expected
Why: Suprachiasmatic-nucleus degeneration disrupts melatonin and circadian rhythm; fatigue, shadows and a reversed sleep pattern amplify it. Expected in established dementia — but when it is new, it may be delirium.
Pacing, wanting to "go home" while at home, trouble finding rooms — wandering warning signs Hold & notify
Why: Disorientation to place plus restlessness or an unmet need (toileting, hunger). Six in ten people with dementia wander at least once; a missing person not found within 15 minutes is a 911 call.
Well-formed visual hallucinations, fluctuating alertness, parkinsonism, acting out dreams — the Lewy body pattern Hold & notify
Why: α-Synuclein disease with a deep cholinergic deficit; REM sleep behavior disorder and early orthostatic hypotension are supportive. Matters at the bedside because these patients have severe antipsychotic sensitivity.
Stepwise decline with focal signs (hemiparesis, facial weakness, field cut) — the vascular pattern Report immediately
Why: Each infarct removes another block of function; deficits emerge within 6 months of a stroke. A sudden new focal deficit is a stroke work-up, not a dementia note.

Diagnostics

Test In this disorder Normal
Confusion Assessment Method (CAM) Sensitivity 94–100%, specificity 90–95% — its high specificity lets it rule delirium in; the 3-minute 3D-CAM performs similarly. Needs a baseline from family or caregiver to judge "acute change." Adaptations exist for the ICU, ED and nursing home Positive = (1) acute change with fluctuating course and (2) inattention, plus either (3) disorganized thinking or (4) altered level of consciousness CAM (via StatPearls) Features 1 and 2 absent
CAM-ICU (with RASS first) Alternative ICDSC: consciousness rated A–E, then 8 items, score ≥ 4 = delirium. Both screens run every shift in the ICU as the "D" of the ABCDEF bundle Step 1: Richmond Agitation-Sedation Scale (−5 to +4) — patient must be arousable enough to assess; step 2: the four CAM features, 3 of 4 required (1 and 2 plus 3 or 4) CAM-ICU / ICDSC (via StatPearls) —
4AT (4 A’s Test) Under 2 minutes, no special training: Alertness, AMT-4 (age, date of birth, place, current year), Attention (months of the year backward from December), Acute change or fluctuating course. Pooled sensitivity 76%, specificity 94% 0 = delirium/cognitive impairment unlikely · 1–3 = possible cognitive impairment · ≥ 4 = possible delirium 4AT (via StatPearls / PMC validation) —
Delirium work-up — first rule out the killers Brain imaging is not routine — reserve CT for a new focal deficit, fall or head trauma, unexplained depressed consciousness, or suspected intracranial infection or bleed (focal deficits, not anticoagulation status, predict an abnormal scan). Pain and constipation are assessed as part of the work-up Hypoxia (SpO₂/ABG), MI (ECG), hypoglycemia (glucose) first; then CBC, complete metabolic panel, urinalysis, ECG, chest radiograph, bladder scan for retention; blood cultures, toxicology, EEG, LP only when indicated —
Urinalysis in the confused older adult The trap: asymptomatic bacteriuria is present in 40–50% of adults over 80 and about half of long-term-care residents. Bacteriuria plus confusion is not proof — AGS Choosing Wisely: "Don’t use antimicrobials to treat bacteriuria in older adults unless specific urinary tract symptoms are present" True UTI pattern: > 10 WBC/hpf, positive nitrite ± leukocyte esterase, culture typically ≥ 100,000 CFU/mL — with fever, dysuria, suprapubic pain, or new urgency, frequency or incontinence McGeer criteria / AGS Choosing Wisely 2013 ≤ 10 WBC/hpf, nitrite negative
Cognitive screening (MMSE · MoCA · Mini-Cog) A screen alone never diagnoses dementia — functional decline is required, and neuropsychological testing is the most reliable way to detect MCI. Nurses repeat the same tool over time to establish baseline and catch decline Documents the domain pattern and decline over time; MMSE is a 30-point, under-10-minute test of orientation, registration, attention, recall and language; MoCA is more sensitive for MCI and executive function; Mini-Cog is 3-item recall plus clock drawing in about 3 minutes —
Dementia laboratory screen Also screen for delirium, depression, offending medications, alcohol, sleep apnea and sensory deficits before labeling anyone "demented." Routine labs reveal no specific abnormality in AD CBC, urinalysis, metabolic panel, vitamin B12, folate, TSH, syphilis and HIV serology — normal in AD; the purpose is to catch the reversible mimics —
Neuroimaging & AD biomarkers Amyloid confirmation (PET or CSF) is the gate for anti-amyloid antibody therapy; DaTscan separates Lewy body/parkinsonian dementias. Blood p-tau tests are not yet ready for routine use, and the definitive diagnosis remains pathological — clinical history gives a probable diagnosis MRI without contrast is often the initial test: entorhinal → medial temporal/hippocampal atrophy in AD; FLAIR white-matter ischemia and lacunes with a preserved hippocampus in vascular dementia. CSF: Aβ42 decreased, p-tau and total tau increased; amyloid PET confirms plaque pathology —

Complications

Warning: Delirium is not always reversible — and it kills Report immediately
Postoperative delirium carries 7–10% 30-day mortality versus about 1% without; ICU delirium 2- to 4-fold mortality; prolonged delirium about 3× the risk of death in the following year. 45% are still delirious at discharge, 33% at one month.
Delirium can be "only partially reversible, persistent, or even irreversible," is an independent risk factor for later dementia, and accelerates decline in AD — with baseline dementia predicting persistence for more than 5 years. Patient framing: when the cause is treated, recovery often follows, but it can take weeks or sometimes months. Every hour of unrecognized delirium is time the cause goes untreated — a new acute confusion is an emergency-level work-up.
Warning: Falls, fractures, lines pulled, functional decline Hold & notify
Delirium produces falls and injuries from combative behavior, unintentional catheter and tube removal, pressure ulcers, malnutrition, dehydration, prolonged ventilation, a stay 2–3 days longer, and institutionalization instead of home.
The reflex responses make it worse: restraints (pressure ulcers, asphyxiation, nerve injury, head injury, rhabdomyolysis from struggling, PTSD) and benzodiazepines (more than double falls and hip fractures, worsen delirium) are both last resorts, not first moves. Fall precautions, tether removal, mobilization and a family member at the bedside are the safer path.
Warning: Dysphagia → aspiration pneumonia — the usual terminal event Report immediately
Late-stage swallowing failure plus immobility and declining immune function make pneumonia the most common cause of death in AD; death typically comes from infection or organ failure.
Coughing or choking at meals, wet voice, new dyspnea or fever after eating are report-now findings. The intervention is assisted hand feeding — upright, distraction-free, small pieces, thickened liquids as needed — not a feeding tube: AGS Choosing Wisely states tubes do not reduce aspiration pneumonia or improve nutrition and increase agitation, restraint use and pressure ulcers.
Warning: Wandering & safety mishaps Report immediately
Six in ten people with dementia wander at least once; fire and cooking accidents, medication errors, firearm access and unsafe driving are the other named hazards — many wanderers are found within 1.5 miles, but the search cannot wait.
Search the immediate area, then call 911 if the person is not found within 15 minutes, telling responders about the dementia. Prevention: door and window alarms, deadbolts out of sight-line, hidden keys and coats, night lights, structured daytime activity, an ID bracelet and enrollment in a wandering response service such as MedicAlert’s Safe & Found. A person living with dementia is never left unsupervised in new or changed surroundings.
Caution: Antipsychotic harm in dementia — the FDA boxed warning Hold & notify
Older patients with dementia-related psychosis have about 1.6–1.7× the mortality of other patients on antipsychotics: 4.5% vs 2.6% deaths across 17 placebo-controlled trials of roughly 10 weeks, mostly cardiovascular (heart failure, sudden death) or infectious (pneumonia), plus stroke with second-generation agents.
Antipsychotics are not FDA-approved for dementia-related psychosis; AGS Choosing Wisely: don’t use them as first choice for BPSD. In Lewy body disease sensitivity is severe and haloperidol is contraindicated. Effect sizes are small, about 80% of long-term users were discontinued without worsening, and wandering and vocalizations rarely respond to drugs at all. When one is given for agitation it is a chemical restraint under Joint Commission standards — question the order, and expect a taper attempt every 3–6 months.

Medications for this condition

Why each class is prescribed here — every card links to its full pharmacology page.

Alzheimer / Dementia Agents
Nervous · donepezil

These exist because of the cholinergic chain: loss of nucleus basalis neurons starves the cortex of acetylcholine, so cholinesterase inhibitors (donepezil, rivastigmine, galantamine) block ACh breakdown to slow the worsening of symptoms — symptomatic only, they do not halt progression, benefit is modest and variable, and many patients and providers forgo them. Memantine, an NMDA antagonist that blunts glutamate excitotoxicity, is approved for moderate-to-severe AD and is often combined with a cholinesterase inhibitor. Disorder-specific traps: cholinesterase inhibitors cause bradycardia, conduction defects and syncope → falls (monitor heart rate and weight; avoid with sick sinus or active GI ulcer); they are the mainstay in Lewy body dementia, have no proven benefit in FTD, and are not recommended for delirium. Anti-amyloid antibodies are a separate class: lecanemab (FDA traditional approval July 2023) and donanemab (July 2024) slow decline by roughly 27–29% in early AD with confirmed amyloid, carry a boxed warning for ARIA (edema, microhemorrhage — headache, confusion, dizziness, seizures) and require APOE ε4 testing and serial MRI; aducanumab was discontinued in January 2024.
Antipsychotics
Nervous · haloperidol

Mostly what these disorders are not treated with. In delirium there is no FDA-approved drug, and evidence "does not support the routine use of antipsychotics to shorten delirium duration, hasten cognitive recovery, or prevent new episodes" — use is restricted to severe agitation that threatens safety, at the lowest dose, adjusted daily, stopped as soon as feasible, with a baseline ECG and QTc monitoring; no pharmacotherapy is indicated for hypoactive delirium. In dementia they are the last step after pain, triggers, environment and non-drug measures, because of the boxed warning (≈ 1.6–1.7× mortality, 4.5% vs 2.6%) and stroke risk. Lewy body and Parkinson disease dementia: haloperidol is contraindicated; only quetiapine, pimavanserin or clozapine are considered. Benzodiazepines are worse still — they double falls and hip fractures and deepen delirium; their one delirium indication is alcohol or benzodiazepine withdrawal.

Beyond medications

  • Delirium: find and fix the cause — "the main treatments for delirium are nonpharmacologic": stop or adjust the offending drug (reconcile with the pharmacist against AGS Beers 2023), treat infection and hypoxia, correct glucose, sodium and dehydration, relieve pain, constipation and urinary retention, remove the catheter, restore sleep. Treatment "focuses on the causes and symptoms of delirium," and "The first step is to identify the cause."
  • HELP (Hospital Elder Life Program) bundle — six targets: reorientation (clocks, calendars, therapeutic activities), sleep (quiet, lights down, clustered care, no nighttime vitals or meds), early mobilization and tether removal, vision (eyeglasses on), hearing (aids in), hydration and feeding assistance — plus daily family presence. Cochrane 2021 (22 RCTs, 5,718 participants): multicomponent prevention cut delirium from 18.4% to 10.5%, RR 0.57 (95% CI 0.46–0.71), about a 43% reduction; HELP also cut falls 42%.
  • ICU: the ABCDEF bundle — Assess and manage pain, Both spontaneous awakening and breathing trials, Choice of light sedation avoiding benzodiazepines, Delirium screening (CAM-ICU/ICDSC), Early mobility, Family engagement. Restraints are the last resort, shortest duration, only after behavioral measures fail — and verbal de-escalation comes first: calm, even tone, respect personal space, one person with one message, name the feeling, appeal to what the person wants.
  • BPSD: the unmet-need sequence — safety check → rule out delirium (new illness, new drug, withdrawal) → characterize the behavior (onset, timing, triggers) → medication review → comfort (pain via PAINAD, constipation, retention) → environment (noise, temperature, over- or under-stimulation) → non-drug interventions (caregiver training, music, bright light, reminiscence, simple tasks, "Bathing without a Battle") → a drug trial only then, reassessed every 3–6 months. Redirect and reassure rather than correct.
  • Sundowning routine — bathing, appointments and outings in the morning or early afternoon; consistent wake, meal and bedtime; maximize daytime sunlight and physical activity; limit napping, caffeine, alcohol and nicotine; larger lunch, lighter supper; well-lit evenings without shadows; no evening TV or chores; dark and quiet at night with no waking for vitals. No evidence for melatonin, trazodone, antihistamines or antipsychotics; avoid benzodiazepines; call the provider to rule out UTI, sleep apnea or a medication cause.
  • Wandering & home safety — door and window alarms, deadbolts out of sight-line, camouflaged doors, night lights, hidden car keys and coats, structured daytime activity, basic needs met (toileting, food, fluids); ID bracelet with name, address and phone, GPS device, and a wandering response service (MedicAlert Safe & Found). At home: stove knobs off, knives and all medicines (including OTC) locked, firearms removed or locked away, hot-water temperature lowered, trip hazards gone, handrails and non-slip mats. Driving: people with dementia often do not notice their own driving problems, so family watches for the warning signs — new dents or scrapes, near misses, tickets or minor accidents, confusing the brake and gas pedals, speeding or driving too slowly, sudden lane changes, or a simple errand that takes far too long because the person got lost. A professional driving evaluation can help, state laws on dementia and driving vary (a few states require physicians to report the diagnosis), and driving can first be limited to short local trips in daylight. When it is no longer safe, the doctor can tell the person to stop, and the family can hide the keys or move or disable the car and arrange other transport (NIA).
  • Late stage: hand feeding, respite, advance care planning — small pieces, finger foods, adaptive utensils, thickened liquids as needed, a distraction-free pleasant mealtime, and assisted oral feeding rather than a feeding tube. Caregiving is a health risk in its own right (BPSD raise caregivers’ psychiatric and cardiovascular disease), so screen for burnout and connect to respite services, adult day care, memory-care units and the Alzheimer’s Association 24/7 Helpline — caregiver training reduces BPSD and delays nursing-home placement. Settle advance directives, power of attorney and code status early, while the person can still state treatment goals.

Nursing considerations

The RN-specific layer — each action paired with the reason it matters.

Assessment & monitoring
Establish the baseline mental and functional status from family or caregiver at admission, and ask about new cough, fever, dysuria, pain, eating, bowel or urinary changes, sleep, falls and medication changes.
Why: The CAM’s first feature is "acute change" — you cannot recognize a change without a baseline. Nurses are often the first to detect delirium and are expected to communicate concerns to the team as soon as possible.
Screen for delirium every shift with the CAM (or CAM-ICU after RASS, or the 4AT), including an attention test — months of the year backward — and orientation to time, place, person and situation.
Why: Attention is the core deficit that separates delirium from dementia; disorganized thinking, hallucinations or difficulty maintaining consciousness are delirium signs unless proven otherwise, and 60–72% of cases are missed without a structured screen.
Treat the quiet patient as seriously as the agitated one: note "sleeping more than usual," "hasn’t eaten much," or "just stays in the room" as possible hypoactive delirium.
Why: Hypoactive delirium is the most commonly missed form and carries the highest morbidity and mortality — it is mistaken for fatigue or depression.
Assess pain with an observational tool (PAINAD) in anyone who cannot self-report, and check for retention (bladder scan) and constipation whenever behavior changes.
Why: Pain is present in about half of people with dementia yet analgesia is given far less often than in cognitively intact peers; untreated pain, retention and constipation are each sourced delirium precipitants and agitation triggers.
On cholinesterase inhibitors, monitor heart rate, weight and syncope; on any antipsychotic, obtain a baseline ECG and follow the QTc.
Why: Cholinesterase inhibitors cause bradycardia, conduction defects and syncope that end in falls, plus GI loss and weight loss; antipsychotics prolong the QTc and carry the dementia mortality warning.
Watch the late-stage patient for dysphagia cues (coughing or choking with meals, wet voice), fever, dyspnea, uncontrolled agitation or pain, and any stage II or higher pressure injury — and notify the provider.
Why: Aspiration pneumonia is the most common cause of death in AD; these are the explicitly sourced report-to-provider triggers for the dementia inpatient.
Interventions & safety
Reconcile medications with the pharmacist and flag anticholinergics, benzodiazepines, opioids (especially meperidine), antihistamines such as diphenhydramine, and corticosteroids for review.
Why: Medication adverse effects account for up to 39% of delirium; the cholinergic-dopaminergic imbalance that produces delirium is exactly what anticholinergics worsen. Stopping or changing these drugs is part of the treatment.
Run the HELP measures every shift: glasses on, hearing aids in, clock and calendar in view, blinds open by day, quiet and dark by night with care clustered, out of bed and walking, fluids and meals assisted, family at the bedside.
Why: Multicomponent prevention reduces delirium incidence by about 43% (Cochrane 2021, RR 0.57) — sensory deprivation, sleep loss, immobility and dehydration are each precipitants the nurse can remove without an order.
Remove tethers — urinary catheters, unnecessary IV lines — and use fall precautions, a low bed and frequent rounding instead of restraints; if a restraint is unavoidable, shortest duration, most-frequent reassessment.
Why: Catheters and restraints are themselves delirium precipitants; restraints cause pressure ulcers, asphyxiation, nerve and head injury, rhabdomyolysis and PTSD. "Physical restraints are the last resort."
De-escalate agitation verbally first — calm, even tone, personal space, one person with one message, name the feeling, redirect — and hunt the unmet need (pain, toileting, hunger, thirst, overstimulation) before requesting any sedating drug.
Why: Agitation clusters around unmet needs and intimate care; antipsychotics are limited to severe safety-threatening agitation and carry 1.6–1.7× mortality in dementia, while benzodiazepines worsen delirium and double falls and hip fractures.
Communicate for the damaged brain: approach from the front and identify yourself, maintain eye contact, speak directly to the person, use simple words, short sentences, one-step directions, yes/no questions and limited choices, give time to respond, and avoid arguing, criticizing or correcting.
Why: Comprehension and word-finding fail before feeling does; caregivers "do better redirecting or reassuring patients rather than trying to correct them." Reorientation cues suit delirium and early dementia; validation and redirection suit established dementia.
Keep a predictable routine: toileting offered every 1–2 hours, pericare, repositioning every 1–2 hours when bedbound, the day’s outfit laid out, bathing and outings in the morning, advance notice of any change.
Why: Structure minimizes agitation and incontinence, protects skin, and front-loads demanding tasks before the sundowning window; routine is the therapy the ledger sources repeatedly name.
Caregiver & patient teaching
Teach the difference between the disease and a sudden change: any rapid new confusion, sleepiness, not eating, "going downhill," or a behavior change after a new medicine means call the provider or seek emergency care.
Why: New acute fluctuating confusion in a person with dementia is delirium until proven otherwise — a medical work-up, not "the dementia getting worse" — and delirium may be only partially reversible if the cause runs unchecked.
Check any sleep aid or antihistamine with the provider before giving it; lock up all medicines, including OTC products and supplements, and use a pharmacist to prune polypharmacy.
Why: OTC sleep aids and antihistamines are anticholinergic and worsen confusion; more than 600 products have anticholinergic activity, and locked storage prevents dosing errors.
Teach the sundowning routine — morning activity and sunlight, limited naps and caffeine, well-lit shadow-free evenings, a calm dark quiet night — and to report new or worsening nighttime confusion.
Why: Circadian disruption from suprachiasmatic degeneration is worsened by fatigue and low light; a new pattern can signal UTI, sleep apnea, or a medication cause that needs the provider.
Set up wandering safety: alarms on doors and windows, keys and coats hidden, an ID bracelet, enrollment in a wandering response service (Safe & Found), and the rule — search 15 minutes, then call 911 and say "dementia."
Why: Six in ten people with dementia wander; most are found within 1.5 miles, but the delay is the danger, and responders search differently when they know the diagnosis.
Teach late-stage hand feeding — upright, small pieces, finger foods, thickened liquids as advised, no distractions — and explain why a feeding tube is not recommended.
Why: Assisted oral feeding is as good or better for comfort and function; tubes do not prevent aspiration pneumonia or improve nutrition and increase agitation, restraint use and pressure ulcers (AGS Choosing Wisely).
Screen the caregiver for burnout at every visit, connect them to respite care, support groups and the Alzheimer’s Association Helpline, and start advance directive, power of attorney and code-status conversations early; repeat and reinforce every teaching point.
Why: BPSD raise caregivers’ own psychiatric and cardiovascular disease; caregiver training reduces BPSD and delays placement; decision capacity is lost as the disease advances; and "regular reinforcement of information and guidance is essential" because retention is limited.

How a real nurse thinks

The clinical-judgment loop, worked for a typical presentation — reasoning, not reference.

  1. 1
    Recognize cues

    The cues that matter are the changes from baseline: a woman who feeds herself and sleeps through the night is now drowsy by day, was awake and pulling lines all night, cannot sustain attention (months backward fails), and rambles — over hours, and fluctuating. Add the precipitant candidates sitting in plain sight: a new anticholinergic (diphenhydramine), three opioid doses, a catheter tether, undertreated pain (grimacing on movement), hyponatremia and a BUN of 34 suggesting dehydration, borderline hypoxia at 93%, no glasses or hearing aids, three days without a bowel movement, and post-fall, post-op status. The noise: repeating questions and needing help dressing — that is her baseline dementia, not the problem.

  2. 2
    Analyze cues

    Run the CAM: acute onset with fluctuation ✓, inattention ✓, disorganized thinking ✓, altered level of consciousness ✓ — CAM positive. This is delirium superimposed on dementia, not "her Alzheimer’s getting worse"; a demented brain has low reserve, so a hip fracture, surgery, a catheter and diphenhydramine are more than enough insult. The UA is the trap: leukocyte esterase alone with a negative nitrite, no fever and no urinary symptoms in an 84-year-old — where asymptomatic bacteriuria runs 40–50% — does not make this a UTI, and treating it would stop the hunt for the real, multiple causes.

  3. 3
    Prioritize

    The dangerous outcomes are the ones delirium buys: falls, a pulled catheter or line, aspiration, and the persistent cognitive loss that follows untreated delirium — plus the harm of the two "fixes" the night nurse proposed. Rule out the killers first (hypoxia, hypoglycemia, MI): SpO₂ 93% earns supplemental assessment and the ECG in the work-up set, glucose is 108. Then the removable precipitants in order of how fast they can go: the diphenhydramine order, the catheter, the pain, the fluids and sodium, the constipation. Haloperidol is not indicated — she is not a danger to herself or others beyond picking at lines — and restraints are a last resort that would add a precipitant.

  4. 4
    Generate solutions

    Nurse-owned now: glasses on, hearing aids in, blinds open, clock and calendar in view, call the daughter to sit at the bedside, breakfast assisted, out of bed to the chair with help, PAINAD score documented and scheduled analgesia clarified. SBAR to the provider anticipating: discontinue diphenhydramine, remove the catheter with a bladder scan afterward, reassess opioid dose against pain scores, complete the delirium work-up (CBC, CMP, ECG, chest radiograph), address sodium and hydration, a bowel regimen, and — per the asymptomatic-bacteriuria rule — hold antibiotics unless fever or urinary symptoms appear while the culture is pending. Pharmacist review of the full list against AGS Beers 2023.

  5. 5
    Take action

    Act, then call: environment and sensory aids fixed, daughter on her way, patient up to the chair, pain treated with the ordered analgesic before movement. Then the SBAR: "POD 1 hip repair, moderate Alzheimer’s at baseline: acute fluctuating confusion overnight, CAM positive with inattention and altered consciousness. Received diphenhydramine 2200 and three oxycodone doses; catheter in; Na 131, BUN 34, SpO₂ 93%; UA leukocyte esterase positive but nitrite negative, afebrile, no urinary symptoms. Requesting: discontinue diphenhydramine, catheter removal, delirium work-up, fluids review, bowel regimen, pain plan. I do not think she needs haloperidol or restraints." The trap avoided: sedating or tying down the symptom while the causes keep running — and starting an antibiotic for bacteriuria.

  6. 6
    Evaluate

    Success over the next 24–72 hours: repeat CAM each shift trending toward negative — attention returning (months backward improving), sleeping at night and awake by day, eating; catheter out with a normal bladder scan; sodium and BUN correcting; bowel movement; pain controlled at rest and with movement; no falls, no pulled lines, no restraints, no antipsychotic. Prepare the daughter honestly: treating the cause often brings recovery, but it can take weeks or sometimes months, and it may not be complete — which is exactly why the causes were chased on day one. Re-escalation triggers: a fever or dysuria (now the UA means something), a new focal deficit, or deepening somnolence.

Scenario — you’re the nurse

Work each question before revealing the answer. Rationales explain the wrong options too.

Orthopedic-medical unit · 0715 handoff, postoperative day 1

An 84-year-old woman with moderate Alzheimer disease, admitted after a fall at home with a hip fracture repaired yesterday. Her daughter describes the baseline: pleasant, oriented to person, repeats questions, needs help choosing clothes and bathing but feeds herself, sleeps through the night. Orders: oxycodone PRN, diphenhydramine 25 mg at bedtime (added on admission for sleep), IV fluids, indwelling urinary catheter from the OR still in place. Night report: "She was up all night pulling at her IV and catheter, didn’t know where she was — I think she needs a haloperidol order or wrist restraints."

0715 vitals — HR 102 · BP 128/74 · RR 20 · SpO₂ 93% on room air · T 37.4 °C
Assessment — drowsy, drifts off mid-sentence; cannot recite the months backward past October; speech rambling; grimaces and guards the hip when repositioned; no glasses or hearing aids in the room; has not eaten since yesterday
Labs (0600) — Na 131 · glucose 108 · BUN 34 · Cr 1.2 · Hgb 9.8
Urinalysis — leukocyte esterase positive · nitrite negative · WBC 5–10/hpf · culture pending · no dysuria, suprapubic pain, or new incontinence reported by daughter
Chart — oxycodone 5 mg ×3 overnight · diphenhydramine given 2200 · last BM 3 days ago · catheter draining 250 mL over 8 h
Q1 Select all that apply
Which findings indicate delirium rather than the patient’s baseline dementia? Select all that apply.
  1. A. Confusion that developed over hours and varies through the day
  2. B. Inability to recite the months of the year backward
  3. C. Awake all night pulling at lines, drowsy and drifting off by morning
  4. D. Repeating the same questions to the nurse
  5. E. Needing help to choose clothing and bathe
Reveal answer & rationale
Answer: A, B, C
Acute onset with fluctuation (A), inattention (B), and altered level of consciousness with a disrupted sleep-wake cycle (C) are CAM features — the acute, fluctuating, attention-centered picture that defines delirium. Repeating questions (D) is the episodic short-term memory loss of Alzheimer disease, and needing help with basic ADLs (E) is the functional loss of the moderate stage — both are this patient’s documented baseline, not a change from it. Confusing baseline dementia features with delirium is how 60–72% of cases get missed in the other direction.
Q2 Multiple choice
The night nurse asks the day nurse to request a haloperidol order "so she stops pulling at her lines." The best response is:
  1. A. "Good idea — haloperidol is the standard treatment for delirium."
  2. B. "Let’s ask for lorazepam instead; it is safer in older adults."
  3. C. "Her agitation is a symptom — let’s find and fix the causes first: the diphenhydramine, the catheter, her pain, and her fluids. Antipsychotics are reserved for severe agitation that threatens safety."
  4. D. "Soft wrist restraints would protect the lines without any drug."
Reveal answer & rationale
Answer: C
Delirium treatment is nonpharmacologic plus reversing the cause; evidence does not support routine antipsychotics to shorten delirium or hasten recovery, and they are restricted to severe agitation that threatens safety (C). Haloperidol as "standard treatment" (A) is the killed claim, and there is no FDA-approved drug for delirium. Benzodiazepines (B) worsen delirium and more than double falls and hip fractures — their only delirium indication is alcohol or benzodiazepine withdrawal. Restraints (D) are the last resort: they are a delirium precipitant themselves and cause pressure ulcers, nerve and head injury, and asphyxiation.
Q3 Put in order
Put the nurse’s first four actions in priority order:
  1. A. Notify the provider (SBAR) with the CAM-positive findings, requesting discontinuation of diphenhydramine, catheter removal, and the delirium work-up
  2. B. Verify oxygenation and glucose and check for chest pain or ECG changes — rule out hypoxia, hypoglycemia, and MI
  3. C. Put on her glasses and hearing aids, open the blinds, place a clock and calendar in view, and call the daughter to the bedside
  4. D. Document the CAM result, PAINAD score, and the plan of care
Reveal answer & rationale
Correct order: B → A → C → D
The delirium work-up begins by ruling out the killers — hypoxia, hypoglycemia and MI — because they end a life in minutes and her SpO₂ is already 93% (B). Escalation follows immediately (A): only the provider can stop the anticholinergic, pull the catheter and order the work-up, and every hour the cause runs is an hour of brain injury. Sensory aids, reorientation cues and family presence (C) are essential HELP measures the nurse owns and can start while waiting for the callback, but they treat vulnerability, not a life threat. Documentation (D) never precedes protecting the patient.
Q4 Multiple choice
The urinalysis returns leukocyte esterase positive, nitrite negative, 5–10 WBC/hpf. The patient is afebrile with no dysuria, suprapubic pain, or new incontinence. The nurse should recognize that:
  1. A. The confusion is explained — a UTI is confirmed and antibiotics should start now
  2. B. Bacteriuria without urinary symptoms is common after age 80 and does not by itself explain the delirium; keep hunting the other causes and hold antibiotics unless fever or urinary symptoms appear
  3. C. The urinalysis is normal and the culture can be cancelled
  4. D. A CT of the head is now the next required test
Reveal answer & rationale
Answer: B
Asymptomatic bacteriuria is present in 40–50% of adults over 80 and about half of long-term-care residents, so a positive UA in a confused older adult is not proof of infection; McGeer criteria and AGS Choosing Wisely reserve antibiotics for fever, dysuria, suprapubic pain, or new urgency, frequency or incontinence (B). Starting antibiotics (A) stops the search for the real precipitants — here a new anticholinergic, a catheter, pain, hyponatremia and dehydration — and breeds resistance without improving outcomes. The UA is not "normal" (C): the culture stays, because the picture may change if she becomes febrile. Head imaging (D) is not routine in delirium — it is reserved for a new focal deficit, head trauma, unexplained depressed consciousness, or suspected intracranial infection or bleed.
Q5 Multiple choice
The daughter asks, "Is this her Alzheimer’s getting worse? Will she come back to how she was?" The best response is:
  1. A. "Yes — this is the next stage of her Alzheimer’s disease."
  2. B. "Once we treat the cause she will be exactly as she was within 24 hours."
  3. C. "This is delirium — a sudden, separate problem caused by her surgery, medicines and illness. Treating the causes often brings improvement, though recovery can take weeks or even months and may not be complete."
  4. D. "There is no way to know; a medication to calm her is the most helpful thing now."
Reveal answer & rationale
Answer: C
Delirium is an acute, medically caused, potentially reversible process distinct from the progressive dementia beneath it; honest framing is that treating the cause often leads to recovery that can take weeks or sometimes months, and it can be partially reversible or persistent — 33% are still delirious at one month, and delirium accelerates decline in AD (C). Calling it the next stage (A) is the exact misattribution that leaves causes untreated. Promising full recovery in 24 hours (B) contradicts the sourced course and sets the family up for distress. Answer D is wrong twice: the cause can be identified and treated, and sedating drugs are not the helpful thing — they are restricted to severe safety-threatening agitation and carry their own mortality warning in dementia.

Common questions

What causes alzheimer’s, delirium & dementia?
Common causes and risk factors include increasing age — the most important ad risk factor; incidence doubles every 5 years after 65, and roughly a third or more of people 85 and older have ad, genetics — apoe ε4 (≈ 3× heterozygous, ≈ 15× homozygous); autosomal-dominant app, psen1, psen2 in early-onset families; down syndrome; first-degree relative with ad, cardiovascular risk — hypertension, mid-life obesity, type 2 diabetes, hyperlipidemia, atrial fibrillation (ad and vascular dementia), smoking, physical inactivity, hearing loss left uncorrected — protective: education, aerobic exercise, cognitive and social activity, mediterranean/dash-style diet, traumatic brain injury (raises dementia risk nearly 70%), and others.
What are the early signs of alzheimer’s, delirium & dementia?
Early findings include Repeating questions, forgetting recent conversations, misplacing items, trouble with finances and driving — mild (early) AD.
Which findings should a nurse report immediately in alzheimer’s, delirium & dementia?
Report immediately: Acute, fluctuating change in mental status from baseline — worse at night, Inattention — cannot recite months backward or follow a conversation, Hypoactive delirium — somnolent, withdrawn, "sleeping more," "not eating," mistaken for fatigue or depression, Hyperactive delirium — agitation, sympathetic activation, hallucinations, pulling at lines, combativeness, Stepwise decline with focal signs (hemiparesis, facial weakness, field cut) — the vascular pattern, and others. These signal deterioration that needs rapid intervention.
What is the difference between delirium and dementia?
Delirium is an acute disturbance of attention and awareness that develops over hours to days, fluctuates, alters consciousness, and is caused by a medical condition, drug, or withdrawal — so it is potentially reversible when the cause is treated. Dementia is a persistent, progressive decline in cognition (memory most prominently in Alzheimer disease) with normal wakefulness and relatively preserved attention early, developing over months to years and impairing daily function. They coexist constantly: about half of hospitalized people with dementia develop delirium on top of it, and any acute change from baseline is treated as delirium until proven otherwise.
Can hospital delirium be prevented?
Yes, in a large share of cases. Multicomponent bundles like the Hospital Elder Life Program (HELP) — reorientation with clocks and calendars, protected sleep with clustered care, early mobilization and tether removal, glasses and hearing aids, hydration and feeding help, family presence, and no restraints — reduced delirium from 18.4% to 10.5% across 22 trials (Cochrane 2021, RR 0.57, about a 43% reduction). Add a medication review that removes anticholinergics, benzodiazepines and unnecessary opioids, and you have removed most of the precipitants a nurse can control.
Why aren’t antipsychotics the answer for agitation in dementia or delirium?
Because they do little and can kill. In dementia they carry an FDA boxed warning: about 1.6–1.7× the mortality (4.5% vs 2.6% over roughly 10 weeks), mostly cardiovascular or pneumonia deaths, plus stroke risk — and they are not approved for dementia-related psychosis. In delirium, evidence does not support routine use to shorten the episode or speed recovery. Both AGS Choosing Wisely and StatPearls reserve them for severe agitation that threatens safety after pain, unmet needs, environment and non-drug measures have been addressed. In Lewy body dementia the sensitivity is severe and haloperidol is contraindicated.

Sources

Reviewed by Hae Suk Lee, RN

Educational summary for nursing students. Scenarios are fictional teaching cases. Always verify against current guidelines and your institution's protocols before acting in practice. Not medical advice.

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