Dementia refers to a global cognitive decline that impacts more than one component of cognitive functioning and involves a memory impairment. The term decline indicates deterioration in cognitive functioning from a previous higher level of functioning (American Psychiatric Association [APA], 2000). The etiology of dementia may be traced to a general medical condition, persistent effects of a substance, or multiple causes. The acquired nature of dementia suggests that it results in decreased mental functioning over time, as compared to an acute or sudden onset. Dementia describes conditions that are usually “both progressive and irreversible”.