Here’s a startling fact: over 10% of people aged 65 and older, and a staggering one-third of those 85 and up, may be living with a condition called LATE dementia—a diagnosis that’s only been recognized for about seven years. But here’s where it gets controversial: despite its prevalence, there’s still no definitive test for it, leaving doctors to diagnose it largely by ruling out other possibilities. And this is the part most people miss: while it shares symptoms with Alzheimer’s disease, LATE dementia is a distinct condition with its own unique challenges and progression. Let’s dive into what this means and why it matters.
LATE Dementia: Unraveling the Mystery
LATE stands for Limbic-predominant Age-related TDP-43 Encephalopathy. In simpler terms, it’s a condition where a protein called TDP-43 accumulates in the limbic system of the brain, affecting areas crucial for memory. Dr. Nicholas Milano, a neurologist at MUSC Health, explains, ‘It often mimics Alzheimer’s, with short-term memory loss as the primary symptom. But there’s a twist: LATE typically emerges later in life, progresses more slowly, and tends to focus on memory issues without quickly spreading to other cognitive functions.’
The Key Differences from Alzheimer’s
While Alzheimer’s rapidly affects problem-solving, language, and spatial skills, LATE usually stays confined to memory difficulties for a longer period. Dr. Milano adds, ‘Alzheimer’s is like a wildfire in the brain, whereas LATE is more like a slow-burning ember.’ This distinction is crucial for diagnosis, but it’s not always clear-cut. For instance, someone in their 80s with mild memory issues might be dismissed as ‘just aging,’ but it could be LATE progressing quietly.
Diagnosing LATE: A Moving Target
New guidelines in the journal Alzheimer’s and Dementia are helping doctors pinpoint LATE more accurately. Here’s the gist: people with LATE often have decent immediate memory but struggle with delayed recall—like remembering something from earlier in the day. They might also find it harder to recall specific words, such as animal names. Interestingly, other cognitive functions remain largely intact in the early stages, though this can change as the disease advances.
The Hippocampus Connection
LATE also leaves a distinct mark on the hippocampus, a brain region vital for memory. Dr. Milano notes, ‘We see significant atrophy or shrinkage in this area on brain scans. If you spot severe hippocampal atrophy, it’s a red flag for LATE.’ This insight is a game-changer for diagnosis, but it’s just the beginning.
The Quest for Treatments
Currently, there are no treatments specifically for LATE. However, research is ramping up. The South Carolina Alzheimer’s Network (SCAN) at MUSC Health is leading the charge, bringing together experts to focus on early diagnosis, coordinated care, and clinical trials. One promising trial at the University of Kentucky is testing whether the heart drug nicorandil can protect brain tissue and halt hippocampal shrinkage in people with mild memory loss.
The Overlapping Puzzle of LATE and Alzheimer’s
Here’s a surprising twist: many people with dementia have more than one type. ‘It’s not uncommon to see someone with both Alzheimer’s and LATE,’ Dr. Milano explains. ‘Unfortunately, this combination tends to worsen the progression. LATE can make Alzheimer’s symptoms more severe.’ This overlap underscores the importance of precise diagnosis and tailored treatment.
Why Early Evaluation Matters
Dr. Milano emphasizes, ‘Not every memory issue is Alzheimer’s. LATE is just one of many causes, and identifying the root is key. Even if a condition isn’t treatable, knowing what’s happening helps patients and families plan for the future.’ This highlights the shift in dementia care—moving from symptom management to targeting the underlying brain pathology.
The Future of Dementia Treatment
Take Alzheimer’s medication Leqembi, for example, which targets amyloid plaques. Similarly, future treatments for LATE will likely focus on reducing TDP-43 levels. Dr. Milano envisions a future where ‘we’ll check for all these biomarkers and treat them accordingly.’
A Call for Discussion
As we unravel the complexities of LATE dementia, questions arise: How will personalized treatments change dementia care? What role will early diagnosis play in improving quality of life? And how can we ensure equitable access to these advancements? Share your thoughts in the comments—let’s keep the conversation going. #MUSC #LATEdementia #AlzheimersDisease #DrNicholasMilano
