What does one of the "I"s stand for in the mnemonic DELIRIUM, which is used to assess causes for delirium in an older patient?

The "I" in the mnemonic DELIRIUM refers to Infection. In the context of assessing an older patient for delirium, it is crucial to identify infections as they are a common and potentially reversible cause of delirium in this population. Older adults often present atypically when they have an infection, and the symptoms may include confusion, altered mental status, or changes in behavior rather than the classic signs of fever or localized pain. Recognizing infections early can lead to prompt treatment, which is essential to improving outcomes and preventing further complications.

Other options do not relate to common causes of delirium. Identity crisis and indigestion are not recognized medical causes of acute changes in cognition or behavior in older patients. Internal injury, while it may influence overall health, is not specifically categorized under causes of delirium in the same direct manner as infections, which are well-documented in medical literature as a significant factor in delirium presentations.