Most common cause of delirium in elderly person?

NORCET 5 mains

Medical & Surgical Nursing

Easy

Appeared in: NORCET 5 mains

Explanation

The use of multiple medications (polypharmacy) is a leading cause of delirium in older adults.
Sources estimate that medications are a secondary cause in nearly one-third of all delirium cases in the elderly.
Drugs with anticholinergic properties, narcotics (opioids), and benzodiazepines are particularly common offenders.
The risk of adverse drug reactions and interactions increases with the number of medications taken, making polypharmacy a major precipitating factor in a vulnerable brain.

Option A: While hypoxia (low oxygen levels) from conditions like heart or lung failure can cause delirium, it is not considered the single most common cause compared to the widespread issue of polypharmacy in the elderly.
Option B: Alcohol withdrawal can cause a severe hyperactive delirium (delirium tremens), but it only affects a specific subset of the elderly population with a history of significant alcohol use. It is less frequent overall than medication-induced delirium.
Option D: This option is incorrect because a valid and well-supported cause, 'Multiple use of medicines,' is listed as an option.

Visual 1: Diagram: A flowchart illustrating the common precipitating factors for delirium (Infection, Medications, Metabolic disturbance) acting on a predisposed individual (older age, dementia, sensory impairment) to cause an acute confusional state.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Delirium in Geriatric Patients as background academic context rather than a clinical decision trigger.
A nurse's primary role in preventing and managing delirium includes meticulous medication reconciliation at admission, transfer, and discharge.
Early identification of delirium using a validated tool like the Confusion Assessment Method (CAM) is crucial for timely intervention and improved outcomes.
What if? If the patient was young and had no other medical history, the most common cause of delirium would shift towards substance intoxication or withdrawal, or a primary CNS infection, rather than polypharmacy.

How to Approach the Question

First, identify the core of the question: it asks for the 'most common' cause of delirium in a specific population ('elderly person').
Evaluate each option based on its prevalence in the geriatric population.
Consider that elderly individuals often have multiple chronic illnesses and are therefore prescribed multiple medications (polypharmacy). This makes medication-related problems highly prevalent.
Compare the prevalence of polypharmacy against other causes like hypoxia or alcohol withdrawal. Polypharmacy is a far more widespread issue in the general elderly population.
Conclude that the most frequent or common contributing factor among the choices is the use of multiple medicines.

Concept Tested & Keywords

Concept Tested: Etiology of Delirium in Geriatric Patients
Stem keywords: delirium, elderly person, cause
Lead-in keywords: Most common
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

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