Mixed dementia is only used in cases where a patient exhibits clear clinical features of more than one cognitive disease that contribute to their dementia symptoms. One in every ten dementia patients will have more than one type of the disease. Mixed dementia is more prevalent among older individuals, such as those who are over seventy-five years old. In most cases of mixed dementia, the affected individual will deal with more symptoms of one type of dementia than the others.
The form of dementia that produces more symptoms is referred to as the predominant form of dementia. The two most common variations of mixed dementia are Alzheimer's disease with vascular dementia and Alzheimer's disease with Lewy body disease. Only a few medications, called cholinesterase inhibitors, have shown efficacy in the treatment of mixed dementia. Medications that prevent vascular problems and strokes may also be used to treat mixed dementia.