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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.
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
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Biomarkers.

Kennedy Watson1, Xingye Chen1, Ying-Chia Lin1

  • 1New York University Grossman School of Medicine, New York, NY, USA.

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 found that extracellular volume fraction (ECVF) decreases during slow-wave sleep (N3) in humans, contradicting prior animal research and highlighting the importance of sleep physiology.

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Area of Science:

  • Neuroimaging
  • Sleep Science
  • Alzheimer's Disease Research

Background:

  • Sleep enhances cerebrospinal fluid (CSF) clearance of amyloid-beta (Aβ) in mice, a key Alzheimer's disease (AD) hallmark.
  • Human studies on sleep's beneficial effects are limited by non-invasive imaging techniques.
  • Previous research indicated a decrease in extracellular volume fraction (ECVF) during human sleep, contrary to animal models.

Purpose of the Study:

  • To confirm the unexpected finding of decreased ECVF during human sleep.
  • To investigate the physiological impact of sleep on brain extracellular volume.
  • To utilize simultaneous sodium MRI and EEG for precise measurements.

Main Methods:

  • 30 cognitively normal subjects underwent 90-min simultaneous sodium (23Na) MRI and MRI-compatible EEG.
  • Extracellular volume fraction (ECVF) was quantified using a two-compartment model.
  • Sleep stages were scored according to AASM standards (wake, N1, N2, N3, REM).

Main Results:

  • Extracellular volume fraction (ECVF) showed changes in both gray and white matter during sleep.
  • A statistically significant decrease in ECVF was observed in gray matter during N3 (slow-wave sleep).
  • No significant ECVF decrease was found in white matter during N3 or in gray/white matter during N2.

Conclusions:

  • ECVF decreases during slow-wave sleep (N3) in humans, confirming prior findings.
  • This human result contradicts previous findings in animal studies.
  • The study underscores the need for further research into the physiological significance of sleep.