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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Heidi Espedal1, Dona M P Jayakody2,3, Adriano Polpo2

  • 1The University of Western Australia, Western Australia National Imaging Facility, Perth, Western Australia, Australia.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
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Summary
This summary is machine-generated.

Early hearing aid intervention in older adults with cognitive impairment showed improved brain metabolism in motor areas. This suggests potential benefits of timely hearing support for brain health.

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Area of Science:

  • Neuroscience
  • Radiology
  • Gerontology

Background:

  • The HearCog trial investigated hearing aid effects on age-related hearing loss and cognitive impairment.
  • A substudy used 18F-FDG PET/CT to assess brain metabolism changes after early versus delayed hearing aid intervention.

Purpose of the Study:

  • To evaluate brain metabolic activity patterns using 18F-FDG PET/CT.
  • To compare metabolic changes between early (Group A) and delayed (Group B) hearing aid intervention groups.

Main Methods:

  • 28 participants (mean age 77.4 years) underwent baseline and 12-month 18F-FDG PET/CT scans.
  • Analysis involved co-registration with a healthy volunteer database (n=33) and automated brain region labeling.
  • Statistical testing compared group differences and database comparisons at both timepoints.

Main Results:

  • No significant baseline differences between groups in demographics or imaging parameters.
  • Early intervention (Group A) showed increased 18F-FDG uptake in 5 brain regions compared to delayed intervention (Group B) at 12 months.
  • Affected regions included central, left central, right rolandic operculum, left paracentral lobule, and left precentral gyrus.

Conclusions:

  • Standardized analysis indicates relative improvements in motor/sensorimotor brain areas with early hearing aid intervention.
  • Further research integrating MRI and PET data is planned for detailed evaluation of cognitive and auditory regions.