The nurse is reviewing the client's admission assessment to determine contributing factors to the client's change in mental status.

Exhibits

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An older adult client was transferred to the ICU after they developed fever and hypotension. The client was initially admitted 4 days ago with a left hip fracture and subsequently underwent total left hip arthroplasty.

The client is alert and oriented to person, place, and time.

Past Medical History: hypertension, congestive heart failure, Parkinson's disease

Social History: Client has visual loss without their glasses. The client is hard of hearing with hearing aids in place.

Rationale:

• An older adult client is at high risk for delirium due to age-related changes in the brain and reduced physiological reserve. ICU environments and acute illness increase susceptibility in older adults. Age over 65 is a primary risk factor in many validated delirium screening tools.

• Fever and hypotension suggest a systemic infection and possible sepsis, which can impair cerebral perfusion. This can trigger acute confusion or delirium, especially in vulnerable individuals. The combination of infection and low blood pressure disrupts normal brain function.

• Total left hip arthroplasty involves major surgery and potential postoperative complications such as infection or pain. Surgical trauma, anesthesia, and immobility all increase delirium risk. Recent surgery also increases inflammatory cytokine activity affecting cognition.

• Past medical history: Parkinson’s disease is linked to higher delirium risk due to existing neurotransmitter imbalances. The condition often coexists with cognitive decline or medication interactions. Parkinson’s-related brain changes make acute confusion more likely.

• Visual loss without glasses limits sensory input and orientation cues, contributing to perceptual disturbances. Poor vision can lead to misinterpretation of surroundings, promoting hallucinations or paranoia. Environmental disorientation is a key factor in ICU-related delirium.