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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.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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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.

Nisha Rani1, Kylie H Alm1, Daniel D Callow1

  • 1Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

Alzheimer's research shows amyloid-beta plaques in the medial orbitofrontal cortex are linked to early tau tangles, while precuneus amyloid is associated with later tau pathology. This regional specificity may improve early detection.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Medical Imaging

Background:

  • Alzheimer's disease (AD) is pathologically defined by amyloid-beta (Aβ) plaques and tau tangles.
  • Aβ deposition precedes cognitive decline, while tau pathology progresses through Braak stages.
  • Understanding the influence of regional Aβ on tau propagation is crucial for AD research.

Purpose of the Study:

  • To investigate the association between regional amyloid-beta (Aβ) burden and tau pathology progression in individuals without dementia.
  • To determine if specific Aβ deposition sites correlate with distinct stages of tau accumulation.

Main Methods:

  • Positron emission tomography (PET) was used to measure Aβ burden (11C-PIB) and tau burden (18F-MK6240) in 192 participants.
  • Aβ burden was assessed in multiple neocortical regions, and tau burden was quantified across 29 regions corresponding to Braak stages.
  • Statistical analyses, including stepwise and hierarchical regressions, were employed to examine regional Aβ-tau associations, controlling for covariates.

Main Results:

  • Medial orbitofrontal cortex (OFC) Aβ was significantly associated with early tau pathology (Braak stages I-II).
  • Precuneus Aβ was significantly associated with later tau pathology (Braak stages III-VI).
  • Including other Aβ regions did not significantly improve the variance explained for any Braak stage.

Conclusions:

  • Amyloid-tau interactions exhibit regional specificity, with medial OFC Aβ linked to early tau and precuneus Aβ to later tau.
  • Localized Aβ burden measurements may enhance early AD detection and understanding of amyloid-tau dynamics.
  • These findings highlight the importance of regional analysis in Alzheimer's disease research.