Which class of medications is most strongly associated with delirium risk in the ICU, particularly when used for sedation?

• A. Benzodiazepines
• B. Beta blockers
• C. Statins
• D. Antihistamines

Answer: (A)

Sedation choices in the ICU strongly influence delirium risk. Among common sedatives, benzodiazepines carry the strongest association with delirium. They work by boosting GABA activity to produce deep sedation and anterograde amnesia, and in critically ill patients, drug clearance can be impaired, leading to accumulation. This combination increases both the likelihood and the duration of delirium. The other drug classes listed don’t have as robust a link to ICU delirium when used for sedation. In practice, clinicians aim to minimize benzodiazepines and use alternatives like dexmedetomidine or propofol when appropriate, along with non-pharmacologic strategies, to reduce delirium risk and support earlier mobilization and recovery.