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Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
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Coronary pressure measurement to assess the hemodynamic significance of serial stenoses within one coronary artery:
N H Pijls1, B De Bruyne, G J Bech
1Department of Cardiology, Catharina Hospital, Eindhoven University of Technology, Eindhoven, The Netherlands.
Circulation
|November 9, 2000
Summary
Accurately assessing coronary artery stenosis significance is crucial. New equations predict true fractional flow reserve (FFR) in patients with multiple stenoses, improving treatment decisions.
Area of Science:
- Cardiovascular medicine
- Interventional cardiology
- Physiology
Background:
- Multiple coronary artery stenoses confound hemodynamic significance assessment.
- Fractional flow reserve (FFR) calculations are complicated by interacting stenoses.
- Previous methods require experimental validation in human subjects.
Purpose of the Study:
- To validate equations predicting true FFR in humans with serial coronary stenoses.
- To assess the hemodynamic significance of individual stenoses in the presence of others.
- To compare predicted FFR with directly measured true FFR.
Main Methods:
- Coronary pressures were measured in 32 patients with 2 serial stenoses.
- Measurements were taken before intervention, after single stenosis treatment, and after both treatments.
- True FFR was measured after stenosis elimination and compared to predicted FFR from initial measurements.
Main Results:
- Predicted FFR (FFR(pred)) closely matched true FFR (FFR(true)) (0.78±0.12 vs 0.78±0.11; r=0.92).
- Hyperemic gradient across a stenosis increased significantly after treating the other stenosis.
- Ignoring stenosis interaction significantly overestimated individual FFR values (0.85±0.08).
Conclusions:
- Coronary pressure measurements during hyperemia offer a practical method for assessing individual stenosis significance.
- The validated equations accurately predict true FFR in the presence of interacting stenoses.
- This method aids in precise hemodynamic assessment for guiding interventions.
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