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Fractional flow reserve (FFR) is a diagnostic technique used in coronary catheterization. FFR measures 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 ).
The instantaneous wave-free ratio (iFR, sometimes referred to as the instant wave-free ratio or instant flow reserve) is a diagnostic tool used to assess whether a stenosis is causing a limitation of blood flow in coronary arteries with subsequent ischemia. iFR is performed during cardiac catheterisation (angiography) using invasive coronary pressure wires which are placed in the coronary ...
FFR may refer to: Medicine ... Fractional flow reserve, a technique used in coronary catheterization; ... Flathead Forest Reserve, Montana;
Fractional flow reserve (FFR): Testing the blood flow through a stenosis of a coronary artery to determine the perfusion of the heart. Intravascular ultrasound (IVUS): Ultrasonography of a coronary artery. Optical coherence tomography (OCT): Testing through the use of optical scattering for coronary artery disease.
Coronary flow reserve is used in diagnostics and treatment of patients with conditions such as coronary artery disease and syndrome X. [7] In the treatment of these conditions, vasodilators are used to allow sufficient blood to flow past a stenosis, for example, and the measurement of CFR enables the efficacy of such interventions to be measured.
In 2007, Zarins together with biomedical engineer Charles Anthony Taylor founded HeartFlow, Inc., a medical technology company based in Redwood City, California, that developed non-invasive, real-time virtual modeling tool for coronary artery disease (CAD) intervention using estimation of fractional flow reserve (FFR).
Fractional reserve banking oblilges participating banks to only keep a fraction of your deposit in reserve, lending out the rest. This generates returns for banks through fees and interest rates.
Apical four chamber ultrasound view of heart. Transthoracic echocardiography (TTE) uses ultrasonic waves for continuous heart chamber and blood movement visualization. It is the most commonly used imaging tool for diagnosing heart problems, as it allows non-invasive visualization of the heart and the blood flow through the heart, using a technique known as Doppler.