The DEAR score identifies elevated pre-existing vulnerability but cannot predict every case of delirium. Delirium has both vulnerability factors (what DEAR measures) and precipitating factors — the acute triggers that tip a patient into delirium. A patient with a DEAR score of 1 can still develop delirium if exposed to sufficient precipitating stressors: severe infection, major surgery, pain, urinary retention, medication changes, or immobility. Delirium risk is always multiplicative between vulnerability and precipitants. A low DEAR score reduces but does not eliminate risk, and universal standard delirium precautions remain appropriate for all hospitalized older adults.

DEAR, DRAT, and PRE-DELIRIC are all pre-admission or admission delirium risk tools, but they differ in scope and setting. DEAR is brief (4 items, 1 minute) and focused on pre-existing vulnerability, making it suitable for rapid pre-operative or acute admission screening. PRE-DELIRIC uses 10 clinical variables at ICU admission and was specifically validated for ICU patients. DRAT (Delirium Risk Assessment Tool) uses a slightly broader variable set. The optimal tool depends on clinical setting: DEAR for rapid pre-operative and acute admission screening; PRE-DELIRIC or E-PRE-DELIRIC for ICU settings where more comprehensive prediction is needed.

The evidence for pharmacological delirium prophylaxis (antipsychotics, melatonin, dexmedetomidine) remains mixed, and current guidelines generally do not recommend routine prophylactic antipsychotics or melatonin based solely on delirium risk score. Non-pharmacological prevention bundles have stronger evidence. However, specific pharmacological interventions are indicated for particular risk items: thiamine and benzodiazepine prophylaxis for patients with significant alcohol use risk; pain management optimization to prevent pain-precipitated delirium; careful sedation protocols in the peri-operative period; and avoidance of high-risk medications (anticholinergics, benzodiazepines, high-dose opioids) in all DEAR-positive patients.

Yes. The four DEAR items can be reliably completed by trained nursing staff during admissions assessment without physician involvement. The assessor needs to determine the presence or absence of cognitive impairment, sensory impairment, ADL dependence, and alcohol risk — information typically obtained through standard nursing admission assessment and brief history taking. Nursing-led DEAR completion improves screening uptake and ensures delirium prevention pathways are initiated promptly without waiting for physician review. Nurses should be trained in the assessment approach for each item and in when to escalate borderline findings to physician review.