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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.
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