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Tracer adenosine: a novel myocardial flow marker
Thomas Lauer1, Robert Loncar, Andreas Deussen
1Klinik für Kardiologie, Pneumologie und Angiologie, Heinrich-Heine-Universität, Düsseldorf, Germany.
Summary
Labeled adenosine accurately reflects local myocardial blood flow in dogs. This study demonstrates adenosine
Area of Science:
- Cardiovascular Research
- Biomedical Imaging
- Pharmacology
Background:
- Accurate local myocardial blood flow (MBF) measurement is crucial in cardiovascular research.
- Current methods face limitations due to a lack of ideal markers.
- Adenosine shows promise as a marker due to its rapid uptake and retention.
Purpose of the Study:
- To test the hypothesis that labeled adenosine deposition density reflects MBF.
- To evaluate adenosine as a potential marker for myocardial perfusion.
Main Methods:
- Tracer microspheres and labeled adenosine ((3)H/(14)C) were simultaneously injected into anesthetized dogs.
- Myocardial deposition densities were measured using scintillation and gamma counting.
- Blood flow distribution was challenged with alprostadil and adenosine degradation was inhibited with EHNA.
Main Results:
- Adenosine and microspheres had no significant hemodynamic effects and were rapidly extracted and retained.
- Deposition densities of labeled adenosine and microspheres showed a close correlation (r=0.93, r²=0.86).
- Adenosine deposition density explained 86% of the variance in local blood flow measurements.
Conclusions:
- Labeled adenosine is a reliable marker for assessing local myocardial blood flow in canine models.
- Adenosine's properties support its use in future cardiovascular studies.
- This finding has implications for both experimental and clinical myocardial perfusion assessment.