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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Joseph Giorgio1,2, Ganna Blazhenets3, Jhony A Mejía-Perez4

  • 1University of California, Berkeley, Berkeley, CA, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
PubMed
Summary
This summary is machine-generated.

We identified distinct patterns of amyloid-beta PET (Aβ-PET) binding in cognitively impaired patients. Occipital Aβ-PET binding may indicate cerebral amyloid angiopathy (CAA) and more severe cognitive impairment.

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Area of Science:

  • Neurology
  • Nuclear Medicine
  • Neuroimaging

Background:

  • The regional distribution of amyloid-beta positron emission tomography (Aβ-PET) signal is not well understood.
  • Data-driven methods were employed to analyze Aβ-PET patterns in over 12,000 cognitively impaired patients across four cohorts.

Purpose of the Study:

  • To identify distinct Aβ-PET binding patterns using data-driven approaches.
  • To investigate the clinicopathological associations of these identified Aβ-PET patterns.

Main Methods:

  • Analysis of multi-tracer template-space Aβ-PET SUVR images in cognitively impaired individuals (MCI/Dementia).
  • Independent component analysis (ICA) and k-means clustering were used to group patients based on Aβ-PET binding topography.
  • Validation of the model across three independent cohorts, assessing associations with clinical impairment, APOE-ε4 status, tau-PET, and neuropathology.

Main Results:

  • Three clusters emerged: Aβ-negative, Aβ-positive with posterior-predominant binding (Aβ+ posterior), and Aβ-positive with typical binding (Aβ+ typical).
  • The Aβ+ posterior group showed more severe clinical impairment, lower APOE-ε4 carrier frequency, and higher posterior tau-PET.
  • Autopsy findings revealed more severe cerebral amyloid angiopathy (CAA) in the Aβ+ posterior cluster compared to the Aβ+ typical cluster.

Conclusions:

  • A reliable method for assigning patients into an Aβ-positive PET binding group with posterior predominance was developed.
  • Occipital Aβ-PET binding is significant and may serve as a biomarker for CAA and more severe cognitive impairment.
  • These findings highlight the importance of considering occipital regions in Aβ-PET assessments.