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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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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:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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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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Updated: Jan 7, 2026

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

Kun He1, Binyin Li2, Qi Huang3

  • 1Huashan hospital affiliated to fudan university, Shanghai, shanghai, China.

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

Glymphatic system impairment is linked to reduced synaptic density in Alzheimer's Disease (AD). This connection is influenced by amyloid-beta plaques and GFAP levels, offering new insights into AD pathology.

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Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Imaging

Background:

  • Glymphatic system impairment is a key feature in Alzheimer's Disease (AD).
  • Limited research exists on the link between glymphatic dysfunction and reduced synaptic density.

Purpose of the Study:

  • To investigate the correlation between glymphatic system function and synaptic density in AD.
  • To explore the roles of amyloid-beta (Aβ) and GFAP in this relationship.

Main Methods:

  • Used diffusion tensor imaging analysis along the perivascular space (DTI-ALPS) as a glymphatic system biomarker.
  • Assessed synaptic density and Aβ PET imaging.
  • Measured peripheral plasma Aβ42, Aβ40, and GFAP.

Main Results:

  • The ALPS index showed a significant correlation with synaptic vesicle glycoprotein 2A (SV2A) PET, a marker of synaptic density, after adjusting for covariates.
  • Positive associations were found between the ALPS index and hippocampal SV2A PET SUVr residuals in individuals with cerebral Aβ deposition or elevated plasma GFAP.
  • In the GFAP-positive group, cerebral Aβ plaque significantly mediated the association between glymphatic function (ALPS) and hippocampal synaptic density.

Conclusions:

  • Glymphatic system impairment is significantly associated with synaptic density loss in AD.
  • This association is modulated by the presence of cerebral Aβ plaques and GFAP levels.