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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

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

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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.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
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
07:20

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Biomarkers.

Lucia Li1,2, Ming Ann Sim3,4, Eugene Tan5

  • 1University of Cambridge, Cambridge, Cambridgeshire, United Kingdom.

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

Bradycardia, or a slow heart rate, is linked to faster cognitive decline in individuals without atrial fibrillation. This association may involve changes in brain structure and elevated biomarkers of neurodegeneration.

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Area of Science:

  • Neurology
  • Cardiology
  • Gerontology

Background:

  • The relationship between bradycardia (slow heart rate) and cognitive decline is not well understood.
  • Mechanisms linking bradycardia to cognitive trajectories require further investigation.

Purpose of the Study:

  • To investigate the association between bradycardia and longitudinal cognitive decline.
  • To explore links between bradycardia, circulating biomarkers, and cerebrovascular disease in individuals without atrial fibrillation (AF).

Main Methods:

  • Resting heart rate (RHR) and cognitive function (using Clinical Dementia Rating-sum of boxes score) were assessed in memory clinic patients over 5 years.
  • Neuroimaging and blood samples were analyzed to evaluate associations with RHR.
  • Linear mixed-effects regression models were used to analyze longitudinal cognitive decline.

Main Results:

  • Bradycardia (RHR <60 bpm) was associated with accelerated cognitive decline (CDR-SB) after adjusting for multiple covariates.
  • Cross-sectional analyses revealed bradycardia was linked to higher levels of plasma neurofilament light chain and phosphorylated tau-181.
  • Bradycardia was also associated with reduced gray matter volume and increased cortical infarcts.

Conclusions:

  • Bradycardia is associated with accelerated cognitive decline in individuals without AF.
  • Further research is needed to elucidate the underlying mechanisms driving this association.