The instantaneous wave- free ratio calculated over this period produces a drug-free index of stenosis severity comparable to FFR.

Discussion: Instantaneous wave- free ratio is able to incorporate the amount of subtended myocardium in its quantification of coronary stenosis severity.

DILEMMA score (DS) is a validated angiographic functional scoring tool that correlates with fractional flow reserve and instantaneous wave- free ratio.

Aortic event free ratio at 24 months was 55.4% in acute AD, 94.4% in chronic AD, and 75.7% in TA.