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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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Related Experiment Video

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

Kevin Grant Solar1, Melisa Gumus2, Sriranga Kashyap1

  • 1Krembil Brain Institute, Toronto Western Hospital, University Health Network, Toronto, ON, Canada.

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

This study links functional MRI and magnetoencephalography measures of hippocampal activity, finding a significant relationship between the two. These findings support using these neuroimaging techniques to understand memory engagement and identify potential biomarkers for Alzheimer's Disease interventions.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biomarker Discovery

Background:

  • Hippocampal hyperactivity on fMRI is linked to Alzheimer's Disease (AD) risk.
  • This hyperactivity may indicate individuals at risk and promote tau pathology.
  • Multimodal neuroimaging is crucial for understanding hippocampal hyperactivity mechanisms.

Purpose of the Study:

  • To compare fMRI and MEG responses in older adults without AD risk factors.
  • To examine the relationship between hippocampal episodic memory engagement measures.
  • To gain insights into hyperactivity mechanisms for future interventions.

Main Methods:

  • 21 older adults (mean age 70) underwent fMRI (pattern separation) and MEG (repetition suppression).
  • Bilateral hippocampal beta coefficients and Lure Discrimination Index (LDI) were calculated.
  • Robust regression tested relationships between fMRI, MEG, and LDI.

Main Results:

  • Significant activation contrasts were found for fMRI and MEG beta band activity.
  • A significant positive relationship was observed between fMRI and MEG hippocampal engagement metrics (R²=0.26, p=0.019).
  • A positive trend emerged between MEG hippocampal activation and LDI (R²=0.15, p=0.087).

Conclusions:

  • MEG provides a direct neural readout of hippocampal activity, indexing memory processes affected in AD.
  • Established the relationship between fMRI and MEG measures of hippocampal engagement and performance.
  • Provided normative biomarker distributions for future intervention trial participant selection.