When Jason Karlawish started working with dementia patients in the late ’90s, there often wasn’t much he could offer them. “I gave them a diagnosis,” he told me on this week’s episode of the “First Opinion Podcast,” but had limited medications to prescribe. Now Karlawish — who is STAT’s Neurotransmissions columnist; a professor of medicine, medical ethics, health policy, and neurology at the University of Pennsylvania; co-director of the Penn Memory Center; and executive producer of the “Age of Aging” podcast — says a revolution is taking place in dementia care, thanks to diagnostics that are removing uncertainty and treatments that actually have some effect.