...The cause of delirium is unclear, but there are many apparent triggers: infections, surgery, pneumonia, and procedures like catheter insertions, all of which can spur anxiety in frail, vulnerable patients. Some medications, difficult for older people to metabolize, seem associated with delirium...
...Other triggers involve disorienting changes: sleep interrupted for tests, isolation, changing rooms, being without eyeglasses or dentures. Medication triggers can include some antihistamines, sleeping pills, antidepressants and drugs for nausea and ulcers...
...Delirium is sometimes treated with antipsychotics, but doctors urge caution using such drugs.
Delirium can wax and wane, not always causing aggressive agitation...
...People with dementia seem at greater risk for delirium, but many delirious patients have no dementia. For some of them, delirium increases the risk of later dementia. In such cases, it is unclear if delirium caused the dementia, or was simply a signal that the person would develop it later...
...Some hospitals are adopting delirium-prevention programs, including one developed by Dr. Inouye, which adjusts schedules, light and noise to help patients sleep, ensures that patients have their eyeglasses and hearing aids, and has them walk, exercise and do cognitive activities like word games...
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