Final answer:
In a client with AIDS, the first sign of dementia, commonly referred to as AIDS dementia complex, is a loss of concentration. This symptom is part of a broader array of cognitive difficulties that contrast with the early signs of Alzheimer's disease, which are oriented more towards memory loss.
Step-by-step explanation:
The first sign of dementia in a client with AIDS (Acquired Immunodeficiency Syndrome) is often a loss of concentration. AIDS dementia complex is associated with the advanced stage of HIV infection, where significant immune system damage can lead to neurological complications.
The onset of dementia in AIDS may initially present with subtle cognitive difficulties, including problems with attention, concentration, and memory. It contrasts with Alzheimer's disease, which typically begins with more pronounced memory loss and confusion about time or place. As the HIV progresses to AIDS, patients may experience various general symptoms, such as fever, weight loss, lymph node swelling, and severe opportunistic infections, indicating the severity of the immune system compromise.