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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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Cardiac myocytes produce these hormones in response to ventricular stretching...
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Ryan T Muir1,2, Andrew E Beaudin3, Cheryl R McCreary3,4

  • 1University of Toronto, Toronto, ON, Canada.

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

Plasma neurofilament light chain (NfL) and lower amyloid-beta 42/40 (Aβ42/40) levels are linked to cognitive decline and brain changes in cerebral amyloid angiopathy (CAA). These findings suggest white matter damage, not tau injury, drives cognitive impairment in CAA patients.

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Area of Science:

  • Neurology
  • Biomarker Research
  • Neuroimaging

Background:

  • Cerebral amyloid angiopathy (CAA) is a cerebrovascular disease associated with cognitive impairment.
  • Plasma biomarkers may offer insights into CAA pathophysiology and its impact on cognition.
  • This study investigates the relationship between plasma biomarkers and neuroimaging findings in CAA.

Purpose of the Study:

  • To examine the association between plasma biomarkers (Aβ42/40, p-tau, NfL, GFAP) and cognitive function in individuals with CAA.
  • To explore the relationship between these plasma biomarkers and neuroimaging markers (e.g., white matter hyperintensities, cortical volumes, cerebrovascular reactivity) in CAA.
  • To determine if cognitive impairment in CAA is related to white matter damage or tau-related cortical injury.

Main Methods:

  • Cross-sectional analysis of a prospective cohort study involving participants with probable CAA.
  • Plasma samples were analyzed for Aβ42/40 (Simoa and IP-MS), p-tau181, NfL, and GFAP (Simoa).
  • Participants underwent magnetic resonance imaging (MRI) and cognitive evaluations, including the Montreal Cognitive Assessment (MoCA).

Main Results:

  • Higher NfL levels correlated with lower MoCA scores and reduced global cerebrovascular reactivity.
  • Lower Aβ42/40 levels were associated with slower processing speed and higher white matter hyperintensity (WMH) volumes.
  • Higher GFAP levels were linked to lower total cortical volumes, and higher p-tau181 was associated with increased WMH volume.

Conclusions:

  • Plasma NfL and reduced Aβ42/40 are associated with cognitive deficits and neuroimaging abnormalities in CAA.
  • The findings suggest that cognitive impairment in CAA may stem from progressive white matter damage.
  • These biomarkers may help elucidate the mechanisms underlying cognitive decline in cerebral amyloid angiopathy.