Delirium in the ICU: an overview

Area of Science:

• Critical Care Medicine
• Neuroscience
• Geriatrics

Background:

• Delirium is a common disturbance of consciousness and cognition, often with acute onset and fluctuating course.
• It is particularly prevalent in intensive care unit (ICU) patients, especially those on mechanical ventilation.
• Delirium subtypes include hyperactive, hypoactive, and mixed, and it is frequently underdiagnosed without specific tools.

Purpose of the Study:

• To review the characteristics, diagnosis, prognostic implications, and treatment of delirium in the ICU.
• To highlight the importance of accurate diagnosis using validated instruments like the Confusion Assessment Method for the ICU (CAM-ICU).
• To discuss current and emerging treatment strategies, including non-pharmacological and pharmacological interventions.

Main Methods:

• Review of existing literature on delirium in the ICU.
• Discussion of diagnostic tools, focusing on the CAM-ICU.
• Analysis of prognostic data and treatment options, including traditional and newer agents.

Main Results:

• Delirium in mechanically ventilated patients is associated with significantly increased short-term (2.5-fold) and 6-month (3.2-fold) mortality.
• Non-pharmacological interventions like physical and occupational therapy can reduce delirium duration.
• Second-generation antipsychotics may offer a better safety profile than haloperidol, and dexmedetomidine shows potential as an adjunctive treatment.

Conclusions:

• Accurate and timely diagnosis of delirium in the ICU is crucial due to its significant prognostic implications.
• Non-pharmacological approaches should be prioritized to decrease delirium duration.
• Further research is needed for optimal pharmacological management, with second-generation antipsychotics and dexmedetomidine as promising alternatives.