- Instantaneous wave-Free Ratio (iFR)
- Fractional Flow Reserve (FFR)
- Coronary Flow Reserve (CFR)
- Coronary Physiology
Terminology and Descriptions of the Index Abbreviations - Dr. Ricardo Petraco
Summary
Speaker: Dr Ricardo Petraco, Imperial College Healthcare NHS Trust, London
Ricardo Petraco discusses different physiological indices, and explains the derivation and methods for calculation...
Summary
Speaker: Dr Ricardo Petraco, Imperial College Healthcare NHS Trust, London
Ricardo Petraco discusses different physiological indices, and explains the derivation and methods for calculation of each index.
Key learning points:
- 1. Pd/Pa, FFR (Fractional Flow Reserve) , and iFR (Instantaneous Wave-free ration) are pressure-only indices measures using a ratio of the Pd (wire pressure) and Pa (aortic pressure)
- 2. Pd/Pa and FFR are measured across the entire cardiac cycle, typically using a moving average of 3-5 beats
- 3. iFR is measured over a phase in diastole, the Wave Free-period where resistance is low and most stable
- 4. CFR (Coronary Flow Reserve) is the ratio of mean basal flow by mean hyperaemic flow
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