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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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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Histological Quantification of Chronic Myocardial Infarct in Rats
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Published on: December 11, 2016

Quantifying acute myocardial injury using ratiometric fluorometry.

Mahsa Ranji1, Muneaki Matsubara, Bradley G Leshnower

  • 1Burnham Institute for Medical Research, La Jolla, CA 92037, USA.

IEEE Transactions on Bio-Medical Engineering
|March 11, 2009
PubMed
Summary

Assessing mitochondrial fluorescence after reperfusion therapy can predict myocardial injury. This method helps identify high-risk patients early, improving long-term outcomes for myocardial infarction (MI).

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Mitochondrial Physiology

Background:

  • Early reperfusion is critical for myocardial infarction (MI) treatment, but its effectiveness varies, impacting patient prognosis.
  • Identifying patients at high risk for poor outcomes post-reperfusion is crucial for timely intervention.
  • Mitochondrial dysfunction, quantifiable by fluorometry, is linked to cell death after reperfusion.

Purpose of the Study:

  • To investigate if mitochondrial nicotinamide adenine dinucleotide (NADH) and flavoprotein (FP) fluorescence can acutely predict myocardial injury extent after reperfusion.
  • To establish a correlation between early fluorescence changes and infarct size.

Main Methods:

  • A rabbit model of myocardial infarction was created (30 min occlusion, 3 h reperfusion).
  • Varying infarct sizes were induced using cyclosporine A infusion prior to ischemia.
  • A specialized fluorometric probe measured NADH and FP fluorescence in the ischemic area.

Main Results:

  • Early changes in NADH and FP fluorescence at 15 minutes post-reperfusion correlated significantly with infarct size (r = 0.695, p < 0.01).
  • This correlation improved over time, reaching r = 0.827 (p < 0.001) at 180 minutes.
  • Mitochondrial fluorescence accurately predicted the degree of myocardial injury.

Conclusions:

  • Acutely measured mitochondrial NADH and FP fluorescence can predict myocardial injury after reperfusion therapy.
  • Catheter-based myocardial fluorometry offers a potential minimally invasive method for early assessment of reperfusion success.
  • This technique could aid in identifying high-risk MI patients for optimized treatment strategies.