In delirium causes, which option reflects infectious contributor?

• A. Dehydration
• B. Infections (UTI and respiratory)
• C. Sensory impairment
• D. Environmental challenges

Answer: (B)

Delirium in patients, especially older adults, often has multiple precipitating factors, and infections are a key infectious contributor. When the body fights an infection, inflammatory mediators such as cytokines circulate and can affect the brain, disrupting neurotransmitter balance—reducing acetylcholine activity and increasing dopamine—and altering arousal systems. This combination impairs attention and cognition, causing the acute, fluctuating confusion that defines delirium. Urinary tract infections and pneumonia are common infectious triggers and may present primarily as delirium rather than typical infection signs, so recognizing infection as a contributor is crucial for treatment.

Dehydration and metabolic disturbances, sensory impairment, and environmental challenges can precipitate delirium by stressing brain function or overwhelming someone’s coping resources, but they are not infectious processes. Understanding that delirium is multifactorial helps guide comprehensive assessment and management, including addressing infection promptly, optimizing hydration and nutrition, ensuring adequate sensory input, and minimizing environmental stressors.