When performing FFR what is the threshold that indicates a significant stenosis?
The normal value of FFR is 1.0 and is not affected by changes in heart rate, blood pressure, or myocardial contractility. FFR values <0.75: the stenosis is hemodynamically significant and revascularization should be performed.
What is negative FFR cardiology?
For the most part, a negative FFR predicts the ability to safely defer interventional treatment of an intermediate lesion, with a relatively low risk of downstream events.
What is quality FFR?
FFR is defined as the ratio of mean distal coronary pressure to mean aortic pressure. Incorporating stenosis severity, myocardial territory and viability, and collateral perfusion, FFR is able to fully assess the functional significance of a coronary stenosis.
What is significant iFR?
iFR® cut-off value and fractional flow reserve-measurement: An iFR®-value of ≤ 0.89 indicates a hemodynamically significant stenosis (above, red bars), whereas an iFR®-value of ≥ 0.90 indicates no need for an intervention (green bar).
What is the cut off FFR number for a vessel to need intervention?
Cutoff value of invasive FFR for hemodynamically significant ischemia was defined as ≤0.80.
What does FFR measure?
Fractional flow reserve (FFR) measurement involves determining the ratio between the maximum achievable blood flow in a diseased coronary artery and the theoretical maximum flow in a normal coronary artery.
What is FFR diagnosis?
Fractional flow reserve (FFR) is a diagnostic technique used in coronary catheterization to measure pressure differences across a coronary artery stenosis (narrowing, usually due to atherosclerosis) to determine the likelihood that the stenosis impedes oxygen delivery to the heart muscle (myocardial ischemia).
What is FFR data?
FFR is defined as the ratio of maximal achievable blood flow in coronary artery to the hypothetical maximal achievable blood flow in the same artery in the absence of stenosis. It is derived from the ratio of the mean distal coronary artery pressure to the mean aortic pressure during the period of maximum hyperemia.
What is FFR to lad?
Fractional flow reserve (FFR) can accurately identify those patients with equivocal lesions in the proximal left anterior descending (LAD) artery who may not need revascularization and will see comparable outcomes with medical management, according to a study published online October 26, 2011, ahead of print in JACC: …
How do you calculate coronary flow reserve?
14.10). Coronary flow velocity reserve is calculated as the ratio between the maximum diastolic flow velocity at peak stress and baseline, and a value less than 2 indicates the presence of significant coronary artery stenosis (>70%).
What does cardiac ischemia feel like?
The most common symptom of myocardial ischemia is angina (also called angina pectoris). This is chest pain (similar to indigestion or heartburn) that feels like: Chest discomfort. Heaviness.
What is a good coronary flow reserve?
A normal CFR is considered to be greater than 2.0 and in most patients should be somewhere between 3 and 5.
What does no flow limiting stenosis mean?
A coronary stenosis of ≥50% without any associated myocardial ischaemia was considered to be non-flow-limiting. Conversely, a reversible perfusion defect in a territory subtended by a non-stenotic coronary artery was considered to represent a false-positive MPI result.
What is normal myocardial blood flow reserve?
In normal individuals, average values of MBF at rest are 0.6 to 1.3 mL/min/g (average, 0.98±0.23 mL/min/g) (30,31).