What are the key features and risk factors of delirium in advanced illness?

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Multiple Choice

What are the key features and risk factors of delirium in advanced illness?

Delirium in advanced illness is an acute, fluctuating disturbance of attention and cognition. It presents as an abrupt change in a patient’s ability to focus, sustain and shift attention, with disorganized thinking and often an altered level of consciousness that ebbs and flows over hours and days. People may become disoriented, have difficulty following conversations, misinterpret surroundings, or show either restlessness and agitation or withdrawn, sleepy states. Importantly, the hypoactive form—where the patient appears sleepy or slowed—occurs frequently and can be easily missed, while the hyperactive form involves marked agitation or restlessness. The risk factors listed—polypharmacy, dehydration, infection, electrolyte disturbances, organ failure, and sleep deprivation—are classic precipitants because delirium usually results from multiple interacting medical, pharmacologic, and environmental factors that disrupt brain function in vulnerable individuals. In practice, recognizing this pattern helps differentiate delirium from other conditions: it is not a stable cognitive state, it is not caused solely by a psychiatric disorder, and it is not primarily a motor problem. Rather, the hallmark is the acute, fluctuating impairment in attention and thinking driven by reversible medical or medication-related triggers, which is why addressing those triggers and providing supportive care is central to management.

Delirium in advanced illness is an acute, fluctuating disturbance of attention and cognition. It presents as an abrupt change in a patient’s ability to focus, sustain and shift attention, with disorganized thinking and often an altered level of consciousness that ebbs and flows over hours and days. People may become disoriented, have difficulty following conversations, misinterpret surroundings, or show either restlessness and agitation or withdrawn, sleepy states. Importantly, the hypoactive form—where the patient appears sleepy or slowed—occurs frequently and can be easily missed, while the hyperactive form involves marked agitation or restlessness.

The risk factors listed—polypharmacy, dehydration, infection, electrolyte disturbances, organ failure, and sleep deprivation—are classic precipitants because delirium usually results from multiple interacting medical, pharmacologic, and environmental factors that disrupt brain function in vulnerable individuals. In practice, recognizing this pattern helps differentiate delirium from other conditions: it is not a stable cognitive state, it is not caused solely by a psychiatric disorder, and it is not primarily a motor problem. Rather, the hallmark is the acute, fluctuating impairment in attention and thinking driven by reversible medical or medication-related triggers, which is why addressing those triggers and providing supportive care is central to management.

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