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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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Related Experiment Video

Updated: Jan 7, 2026

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

Lin Hu1, Xiang Fan1, Keyan Yu1

  • 1Peking University Shenzhen Hospital, Shenzhen, Guangdong, China.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

The Serial 7s task, particularly the number of correct answers within 20 seconds (NCA20), shows promise as a simple self-screening tool for Mild Cognitive Impairment (MCI). This audio-analyzed method offers convenience and efficiency for early detection of cognitive decline.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Cognitive Psychology

Background:

  • Mild Cognitive Impairment (MCI) is a transitional stage between cognitive normalcy and dementia.
  • Early diagnosis of MCI is crucial for timely intervention and management.
  • Individuals with MCI often exhibit slower reaction times and impaired working memory and attention.

Purpose of the Study:

  • To investigate the potential of specific parameters from the Serial 7s task as early self-screening biomarkers for MCI.
  • To evaluate the diagnostic utility of audio-recorded Serial 7s task parameters.

Main Methods:

  • The study analyzed audio recordings of the Serial 7s task from 42 MCI patients and 82 cognitively unimpaired (CU) individuals.
  • Key parameters extracted included time to first correct answer (TFC), total task duration (TTD), number of answers within 20 seconds (NA20), and number of correct answers within 20 seconds (NCA20).
  • Statistical analyses were performed using SPSS version 27.0.

Main Results:

  • Significant differences in all Serial 7s task parameters were observed between CU and MCI groups (p < 0.05).
  • The number of correct answers within 20 seconds (NCA20) exhibited the highest diagnostic performance.
  • NCA20 achieved an area under the curve (AUC) of 0.81 (95% CI: 0.728-0.873).

Conclusions:

  • Specific parameters from the audio-recorded Serial 7s task, especially NCA20, demonstrate potential as convenient and efficient early self-screening biomarkers for MCI.
  • Further validation with larger cohorts is recommended to confirm the diagnostic accuracy and clinical utility of these biomarkers.