New Dementia Mimic: Millions May Be Misdiagnosed

Doctors are growing concerned about Limbic-predominant Age-related TDP-43 Encephalopathy (LATE), a dementia that closely resembles Alzheimer's disease. This condition affects a significant portion of the elderly population, with estimates suggesting millions in the U.S. may have been misdiagnosed. LATE and Alzheimer's share similar symptoms like memory loss and cognitive decline, but they stem from different protein accumulations in the brain.

While Alzheimer's is characterized by amyloid plaques, LATE is caused by TDP-43 protein buildup, leading to brain atrophy. This difference means that treatments targeting amyloid may be ineffective for LATE patients. It's estimated that LATE contributes to about 15 percent of dementia cases and frequently coexists with other brain pathologies, complicating diagnoses.

Researchers are actively seeking effective treatments for LATE, for which no specific drugs currently exist. A clinical trial at the University of Kentucky is investigating nicorandil, a medication used for chest pain in Europe and Asia, to see if it can improve blood flow in the brain and protect key memory regions. Definitive diagnosis often requires post-mortem examination, but comprehensive evaluations can help identify LATE during a patient's lifetime.