It is summer and an 82-year-old woman is brought to you from her home after seeing her primary care doctor 2 days ago. She was started on an antibiotic at that time. Today, she comes to the emergency room not knowing where she is or what year it is. What could be a likely cause of this?

Question

Quizplus · Accepted Answer

These are not signs of normal aging and seem to be of acute onset. This makes Alzheimer's less likely. Stroke and meningitis could cause these symptoms as well, but the combination of the heat and a recent infection make delirium much more likely. Though she was prescribed an antibiotic, she may not have improved because of bacterial resistance or because of noncompliance due to cost, depression, or even an underlying mild dementia. Dementia should not result in an acute mental status change, although illness may cause a worsening of dementia.

It Is Summer and an 82-Year-Old Woman Is Brought to You