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

Anna Dewenter1, Benno Gesierich2, Anna Kopczak3

  • 1Institute for Stroke and Dementia Research (ISD), University Hospital, LMU Munich, Munich, Bavaria, Germany.

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

PSMD-2, a novel diffusion MRI marker, enhances sensitivity for detecting small vessel disease (SVD) brain changes. This improved marker reduces sample size requirements for clinical trials, aiding SVD progression monitoring.

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Area of Science:

  • Neuroimaging
  • Diffusion MRI
  • Cerebrovascular Diseases

Background:

  • Small vessel disease (SVD) is common in older adults and linked to Alzheimer's disease.
  • Conventional MRI markers detect late SVD stages; diffusion MRI metrics identify early changes.
  • Peak width of skeletonized mean diffusivity (PSMD) is an established diffusion MRI marker for SVD.

Purpose of the Study:

  • To develop an improved diffusion MRI marker, PSMD-2, for longitudinal assessment of SVD.
  • To enhance sensitivity and reduce sample size requirements for SVD clinical trials.

Main Methods:

  • PSMD-2 was developed using free-water corrected diffusion maps, within-subject templates, and common skeletons.
  • Included 120 subjects with familial SVD (CADASIL) for development and 89 subjects (CADASIL, sporadic SVD) for validation.
  • Benchmarked PSMD-2 against PSMD by estimating sample size reductions for hypothetical clinical trials.

Main Results:

  • PSMD-2 effectively tracked disease progression across all study cohorts.
  • PSMD-2 demonstrated significant reductions in required sample sizes: 24.3% (development), 31.0% (validation CADASIL), and 18.6% (validation sporadic SVD).
  • Ongoing validation includes cerebral amyloid angiopathy and repeatability/reproducibility assessments.

Conclusions:

  • PSMD-2 offers superior sensitivity for detecting SVD-related brain changes compared to PSMD.
  • The marker significantly reduces sample size needs, making it ideal for SVD clinical trials.
  • PSMD-2 is valuable for monitoring SVD progression and comorbid vascular changes in Alzheimer's disease.