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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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Video Experimental Relacionado

Updated: Jan 7, 2026

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

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Biomarcadores

Jessie Fanglu Fu1, Cristina Lois1, Amal Tiss1

  • 1Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo modelo compartimental cuantifica con precisión la contaminación extracerebral de [18F]MK6240 en la imagen de tau de la enfermedad de Alzheimer (EA). Este método mejora la precisión y la sensibilidad para la detección temprana de tau en comparación con la corrección de volumen parcial (PVC).

Palabras clave:
BiomarcadoresEnfermedad de AlzheimerPETTauNeuroimagenRadioquímicaMedicina Nuclear

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Área de la Ciencia:

  • Neuroimaging
  • Radiochemistry
  • Nuclear Medicine

Sus antecedentes:

  • [18F]MK6240 PET imaging shows high affinity for Alzheimer's disease (AD) tauopathy.
  • Meningeal and extracerebral off-target signals complicate early tau detection.
  • Previous work demonstrated irreversible kinetics of off-target signals.

Objetivo del estudio:

  • Evaluar un modelo compartimental alternativo (2TCM+s) para cuantificar la contaminación extracerebral.
  • Comparar el rendimiento del modelo 2TCM+s frente a la corrección de volumen parcial (PVC) para la detección temprana de tau.
  • Evaluar el impacto del modelo 2TCM+s en la relación de estandarización de la captación (SUVR) de cuadros tardíos.

Principales métodos:

  • Thirteen participants (8 controls, 5 MCI) underwent 2-hr [18F]MK6240 PET, MRI, and arterial sampling.
  • A within-reconstruction kernel-based PVC was applied to a subset of participants.
  • Regional uptake was modeled using standard 2-tissue compartmental model (2TCM), 2TCM+s, and 2TCM-kernel.

Principales resultados:

  • El modelo 2TCM+s mostró el mejor rendimiento según el Criterio de Información de Akaike (AIC).
  • El término extracerebral 's' cuantificó la contaminación, siendo más alto en regiones cercanas a las meninges.
  • El SUVR con corrección 2TCM+s exhibió el mayor tamaño del efecto para diferenciar controles de pacientes con MCI.

Conclusiones:

  • Compartmental modeling (2TCM+s) quantifies [18F]MK6240 extracerebral contamination, improving accuracy and sensitivity for early tau detection.
  • This approach shows potential advantages over PVC.
  • Future studies will validate these corrections in larger cohorts and non-dynamic PET data.