Topic: Health

Researchers found that small changes in brain blood flow and oxygen levels may be linked to Alzheimer's disease. They used non-invasive techniques to measure these changes and found that people at risk of developing the disease had weaker vascular function.

Alzheimer's is a complex disease that affects millions of people worldwide. Researchers have long known that amyloid plaque buildup and shrinkage of the hippocampus, the part of the brain responsible for memory, are key signs of the disease. Now, scientists from the Mark and Mary Stevens Neuroimaging and Informatics Institute at the Keck School of Medicine of USC have found a new clue to understanding Alzheimer's: small shifts in how blood moves through the brain and how brain cells receive oxygen.

The study looked at older adults with and without cognitive impairment. Researchers used two non-invasive techniques to measure brain blood flow and oxygen levels: transcranial Doppler ultrasound and near infrared spectroscopy. They then combined these readings using advanced mathematical modeling to create overall indicators of cerebrovascular function.

The results showed that people whose vascular indicators were more similar to those of cognitively healthy adults tended to have lower amyloid levels and a larger hippocampus - both features associated with reduced Alzheimer's risk. The researchers also found that people diagnosed with mild cognitive impairment or dementia had weaker vascular function compared to cognitively normal participants.

This finding supports the view that declining blood vessel health in the brain is part of the broader Alzheimer's disease continuum. Understanding how blood flow and oxygen regulation interact with amyloid and brain structure opens new doors for early detection and potentially prevention.

Why It Matters

Understanding how Alzheimer's starts can help us develop new ways to detect and prevent the disease, which affects millions of people worldwide. By studying the silent changes in brain blood flow and oxygen levels, scientists may be able to identify people at risk before symptoms appear.

Key Facts

• Researchers found that small shifts in brain blood flow and oxygen levels may be linked to Alzheimer's disease
• The study used non-invasive techniques to measure brain blood flow and oxygen levels: transcranial Doppler ultrasound and near infrared spectroscopy
• People at risk of developing Alzheimer's had weaker vascular function compared to cognitively normal participants
• The findings support the view that declining blood vessel health in the brain is part of the broader Alzheimer's disease continuum
• Understanding how blood flow and oxygen regulation interact with amyloid and brain structure opens new doors for early detection and potentially prevention

Key Terms

Cerebrovascular function

The way that blood flows through the brain and delivers oxygen to brain cells

Implications

Understanding how Alzheimer's starts can help us develop new ways to detect and prevent the disease, which affects millions of people worldwide. By studying the silent changes in brain blood flow and oxygen levels, scientists may be able to identify people at risk before symptoms appear.