Fractional Flow Reserve

Fractional flow reserve (FFR) is a technique used in heart catheterization to determine how severely an artery is blocked. It is done by measuring differences in pressure across a narrowed coronary artery to see if the blockage is decreasing oxygen delivery to the heart.

FFR is performed by using a pressure wire to calculate the ratio between how much blood flow is being achieved in a patient’s diseased artery and the maximum possible flow in a normal artery. An FFR measurement of 1.0 is widely accepted as normal, and a value lower than 0.75 – 0.80 is generally considered to be associated with myocardial ischemia, a condition that occurs when blood flow to your heart is reduced. This prevents your heart from receiving enough oxygen and can lead to a heart attack.