Typically how does semantic dementia progress and do you eventually go brain dead or die from something else? my mom, 67 is near mid-stage now.

From something else: Due to not being able to move(you need a brain to tell you to!) pts with dementia develop pneumonia or urinary tract infections or bed sores, which leads to sepsis and they usually succumb to that. It's hard because these pts can't really complain of symptoms either.

Varies: Semantic dementia which is also known as primary progressive aphasia is a form of frontal temporal lobe dementia. The decline takes place over several years but usually less than 10 years. The cause of death often is pneumonia though other illnesses can be involved. The lungs and heart are not affected by these types of dementia.