Fraction Flow Reserve (FFR) is traditionally used to quantify the degree of coronary artery narrowing to evaluate for stenting during a catheterization. The FAME trial re-defined flow limiting lesions as < 0.8 which is used to decide which lesions to stent. Diastolic FFR has also been used in the evaluation of myocardial bridging with a flow rate < 0.76 do determine if a lesion should be stented or not. Interestingly enough, dobutamine is used in the cath lab and NOT adenosine (which is usually used) the determine whether myocardial bridging is causing flow limitation.

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