What is the most common cause of delirium in older adults?

NORCET 2 -2021 (Shift-2)

Mental Health Nursing

Easy

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

Medications are a leading and often reversible cause of delirium in older adults, estimated to be responsible for up to one-third of cases.
The use of multiple medications (polypharmacy), common in the elderly, significantly increases the risk of drug interactions and side effects that can precipitate delirium.
Older adults experience age-related changes in drug metabolism, making them more susceptible to the central nervous system effects of common drugs, especially those with anticholinergic, sedative, or narcotic properties.
Recognizing medications as a potential cause is a critical nursing function, involving medication review and communication with the prescribing provider.

Option B: Alcohol withdrawal causes a specific type of delirium (delirium tremens) but is not the most common cause in the general elderly population, as it is contingent on a history of alcohol dependence.
Option C: While hypoxia (low oxygen) is a critical and potent cause of delirium, evidence suggests that infections and medication-related issues are statistically more frequent precipitants in the older adult population.
Option D: Dementia is the single greatest risk factor for delirium, not a direct cause. It represents a chronic baseline cognitive impairment, which makes the brain more vulnerable to developing delirium from an acute stressor.

Visual 1: Comparison Table - A side-by-side table comparing the key features of Delirium, Dementia, and Depression (the '3 Ds') focusing on onset, course, duration, and attention.
Visual 2: Flowchart - An infographic illustrating the predisposing factors (e.g., dementia, advanced age) and common precipitating factors (e.g., medications, infection, surgery) that lead to delirium.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Delirium in Older Adults as background academic context rather than a clinical decision trigger.
Nurses are at the forefront of delirium detection. Using a validated screening tool like the Confusion Assessment Method (CAM) is essential for early identification.
A key nursing role is prevention, which includes reviewing medications for high-risk drugs (per the Beers Criteria), promoting sleep, ensuring hydration and nutrition, managing pain, and encouraging mobility.
When delirium is identified, the priority is to identify and treat the underlying cause. This involves collaborating with the medical team to investigate for infection, metabolic disturbances, or offending medications.

How to Approach the Question

First, identify the core of the question: it asks for the 'most common cause' of 'delirium' in 'older adults'.
Recall the definition of delirium as an acute, fluctuating state. This helps differentiate it from chronic conditions.
Evaluate the options based on their frequency as a precipitating factor in the general elderly population.
Eliminate 'Dementia' as it is a risk factor, not an acute cause.
Consider the remaining options. While 'Hypoxia' and 'Alcohol withdrawal' are valid causes, think about the common health issues in older adults. Polypharmacy ('Long term medicine') is extremely prevalent and a well-documented, leading trigger for delirium.
Select 'Long term medicine' as it represents the most frequent and modifiable cause among the choices provided.

Concept Tested & Keywords

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