Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

What units of measurement does FFR use?

April 26, 2017ffr measurement units

0

Posted

What units of measurement does FFR use?

1 Answer

0

Posted

FFR is a ratio or index, not a physical unit of measurement. However, the index is a direct representation of the percentage of normal maximum achievable blood flow through the stenosis. For example FFRmyo = 0.75 means that the stenosis has reduced the maximum achievable blood flow to 75% of the normal value. By definition, then, a normal, non-diseased artery must have 100% of the normal maximum flow or FFRmyo = 1.0. This normal value has been demonstrated experimentally and in humans (9) .