Which term is defined as acute reversible confusion?

Which term is defined as acute reversible confusion?

• A. Alzheimer's disease
• B. Pyelonephritis
• C. Delirium
• D. Nitrogen Narcosis

Answer: (C)

Acute reversible confusion refers to a sudden change in mental status with impaired attention and awareness that can improve once the underlying cause is treated. The term that describes this syndrome is delirium. It typically begins abruptly, may fluctuate over hours to days, and presents with inattention, disorganized thinking, and altered consciousness. Because delirium is driven by an identifiable medical issue—such as infection, metabolic disturbance, dehydration, medications, or substance withdrawal—addressing that cause can reverse the cognitive disturbance. This differs from Alzheimer’s disease, which is a chronic, progressive neurodegenerative condition where cognitive decline accumulates over years and is not typically rapidly reversible. Pyelonephritis is a kidney infection; while it can precipitate delirium in vulnerable patients, it is not a term for the cognitive state itself. Nitrogen narcosis is a dive-related intoxication from dissolved nitrogen that temporarily impairs cognition but is not the general medical syndrome of acute confusion. In practice, recognizing delirium is crucial because it signals an acute medical problem requiring prompt assessment and management. Delirium can present as hyperactive, hypoactive, or mixed, and should prompt evaluation of infection, metabolic issues, medications, hypoxia, and other reversible factors.

Acute reversible confusion refers to a sudden change in mental status with impaired attention and awareness that can improve once the underlying cause is treated. The term that describes this syndrome is delirium. It typically begins abruptly, may fluctuate over hours to days, and presents with inattention, disorganized thinking, and altered consciousness. Because delirium is driven by an identifiable medical issue—such as infection, metabolic disturbance, dehydration, medications, or substance withdrawal—addressing that cause can reverse the cognitive disturbance.

This differs from Alzheimer’s disease, which is a chronic, progressive neurodegenerative condition where cognitive decline accumulates over years and is not typically rapidly reversible. Pyelonephritis is a kidney infection; while it can precipitate delirium in vulnerable patients, it is not a term for the cognitive state itself. Nitrogen narcosis is a dive-related intoxication from dissolved nitrogen that temporarily impairs cognition but is not the general medical syndrome of acute confusion.

In practice, recognizing delirium is crucial because it signals an acute medical problem requiring prompt assessment and management. Delirium can present as hyperactive, hypoactive, or mixed, and should prompt evaluation of infection, metabolic issues, medications, hypoxia, and other reversible factors.