An older adult patient takes digoxin and hydrochlorothiazide daily,as well as lorazepam (Ativan)as needed for anxiety.Over 2 days,the patient developed confusion,slurred speech,an unsteady gait,and fluctuating levels of orientation.These findings are most characteristic of:

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Delirium is characterized by an abrupt onset of fluctuating levels of awareness,clouded consciousness,perceptual disturbances,and disturbed memory and orientation.The onset of dementia or Alzheimer's disease,a type of dementia,is more insidious.Amnestic syndrome involves memory impairment without other cognitive problems.

An Older Adult Patient Takes Digoxin and Hydrochlorothiazide Daily,as Well