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Copyright ©The Author(s) 2018.
World J Cardiol. Dec 26, 2018; 10(12): 267-277
Published online Dec 26, 2018. doi: 10.4330/wjc.v10.i12.267
Figure 1
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Figure 1 Proximal pressure and distal pressure during a wave-free period (grey shaded). Courtesy of Volcano Corporation, Koninklijke Philips N.V. Amsterdam, The Netherlands. Pa: Proximal pressure; Pd: Distal pressure.
Figure 2
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Figure 2 iFR® cut-off value and fractional flow reserve-measurement: An iFR®-value of ≤ 0. 89 indicates a hemodynamically significant stenosis (above, red bars), whereas an iFR®-value of ≥ 0.90 indicates no need for an intervention (green bar). Accordingly, FFR-indices of ≤ 0.80 lead to a revascularization, whereas FFR-indices of > 0.80 indicate a non-significant coronary stenosis. iFR®: Instantaneous wave-free ratio; FFR: Fractional flow reserve.
Figure 3
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Figure 3 Case of a 69-year-old patient with symptoms of angina pectoris and a history of smoking (30 pack-years). A: Coronary angiography shows an initial two-vessel disease with a significant stenosis of the proximal LAD before percutaneous coronary intervention; B: iFR®-measurement was performed in the proximal LAD (iFR® = 0.63; bolt). FFR: Fractional flow reserve; LAD: Left anterior descending artery; iFR®: Instantaneous wave-free ratio.