What are the types of ICU-acquired delirium?

What are the types of ICU-acquired delirium?

• A. Hypoactive: withdrawn, flat affect
• B. Hyperactive: agitated, impulsive
• C. Mixed: both
• D. All of the above

Answer: (D)

Delirium in the ICU can present in three recognized patterns: hypoactive, hyperactive, and mixed. Hypoactive delirium shows as withdrawal, reduced responsiveness, and a flat affect, which can easily be overlooked because the patient seems quiet. Hyperactive delirium presents with agitation, restlessness, impulsivity, and sometimes combativeness, making it more noticeable and risky. Mixed delirium involves fluctuating between these states, with periods of hypoactivity and hyperactivity shifting over time. Because ICU-acquired delirium can manifest in any of these forms, including transitions between them, the comprehensive answer is that all of these patterns can occur. Focusing on only one pattern would miss presentations where the patient is calm at times or agitated at others, so recognizing the full spectrum is essential.

Delirium in the ICU can present in three recognized patterns: hypoactive, hyperactive, and mixed. Hypoactive delirium shows as withdrawal, reduced responsiveness, and a flat affect, which can easily be overlooked because the patient seems quiet. Hyperactive delirium presents with agitation, restlessness, impulsivity, and sometimes combativeness, making it more noticeable and risky. Mixed delirium involves fluctuating between these states, with periods of hypoactivity and hyperactivity shifting over time. Because ICU-acquired delirium can manifest in any of these forms, including transitions between them, the comprehensive answer is that all of these patterns can occur. Focusing on only one pattern would miss presentations where the patient is calm at times or agitated at others, so recognizing the full spectrum is essential.