Click on image to view larger version.

Figure 4 (A) Mean regression lines (thick lines) with 1 SD (thin lines) for all instantaneous diastolic flow velocity-pressure gradient measurements in normal coronary arteries, arteries with an intermediate stenosis (dashed lines) and with a severe stenosis. (B) Mean regression lines (thick lines) with 1 SD (thin lines) for all severe stenoses before percutaneous transluminal coronary angioplasty (PTCA) and after PTCA and stenting.