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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.

Muneeb Ahmad Muneer1, Harshita Agarwal2, Poorvikha Gowda3

  • 1Allama Iqbal Medical College, Lahore, Punjab, Pakistan.

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

This meta-analysis reveals significantly reduced levels of Acetylcholinesterase (AChE), Butyrylcholinesterase (BChE), Choline Acetyltransferase (ChAT), and choline in Alzheimer

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Medical Research

Background:

  • Alzheimer's disease (AD) is the primary cause of dementia, marked by β-amyloid plaques, tau tangles, and early cholinergic system dysfunction.
  • Cholinergic dysfunction plays a crucial role in the cognitive decline observed in Alzheimer's disease.

Purpose of the Study:

  • To conduct a meta-analysis examining changes in key cholinergic markers in Alzheimer's disease patients compared to healthy controls.
  • To investigate alterations in Butyrylcholinesterase (BChE), Acetylcholinesterase (AChE), Choline Acetyltransferase (ChAT), and choline levels in brain regions and cerebrospinal fluid (CSF).
  • To explore the association between these neurochemical changes and cognitive impairment in AD.

Main Methods:

  • Systematic literature search across MEDLINE, EMBASE, Cochrane, and Scopus databases following PRISMA guidelines.
  • Meta-analysis utilizing R's 'meta' package with inverse variance weighting to calculate mean concentrations and Standardized Mean Differences (SMDs).
  • Assessment of heterogeneity using I² and T² statistics, with T² estimated via restricted maximum-likelihood and Q-profile methods.

Main Results:

  • Significantly reduced activity of Acetylcholinesterase (AChE) was observed in both CSF (SMD = -1.00) and multiple brain regions (SMD = -1.20), particularly frontal and temporal lobes.
  • Choline Acetyltransferase (ChAT) showed a substantial decrease in brain regions (SMD = -2.21), with the most pronounced reductions in the frontal cortex.
  • Reduced levels of Butyrylcholinesterase (BChE) in CSF (SMD = -0.55) and choline in brain regions (SMD = -0.87) were also significant.

Conclusions:

  • The study confirms significantly reduced activity of AChE in CSF and brain regions, BChE in CSF, ChAT in brain regions, and choline levels in brain regions in Alzheimer's disease patients.
  • These findings underscore the widespread cholinergic deficits associated with Alzheimer's disease.
  • Further research is warranted to validate these meta-analytic findings and explore their clinical implications.