TY - JOUR
T1 - Coronary flow reserve calculated from pressure measurements in humans
T2 - validation with positron emission tomography
AU - de Bruyne, Bernard
AU - Baudhuin, Thierry
AU - Melin, Jacques A.
AU - Pijls, Nico H.J.
AU - Sys, Stanislas U.
AU - Bol, Anne
AU - Paulus, Walter J.
AU - Heyndrickx, Guy R.
AU - Wijns, William
PY - 1994/1/1
Y1 - 1994/1/1
N2 - Background: Experimental studies have shown that fractional flow reserve (defined as the ratio of maximal achievable flow in a stenotic area to normal maximal achievable flow) can be calculated from coronary pressure measurements only. The objectives of this study were to validate fractional flow reserve calculation in humans and to compare this information with that derived from quantitative coronary angiography. Methods and Results: Twenty- two patients with an isolated, discrete proximal or mid left anterior descending coronary artery stenosis and normal left ventricular function were studied. Relative myocardial flow reserve, defined as the ratio of absolute myocardial perfusion during maximal vasodilation in the stenotic area to the absolute myocardial perfusion during maximal vasodilation (adenosine 140 μg · kg-1 · min-1 intravenously during 4 minutes) in the contralateral normally perfused area, was assessed by 15O-labeled water and positron emission tomography (PET). Myocardial and coronary fractional flow reserve were calculated from mean aortic, distal coronary, and right atrial pressures recorded during maximal vasodilation. Distal coronary pressures were measured by an ultrathin, pressure-monitoring guide wire with minimal influence on the transstenotic pressure gradient. Minimal obstruction area, percent area stenosis, and calculated stenosis flow reserve were assessed by quantitative coronary angiography. There was no difference in heart rate, mean aortic pressure, or rate-pressure product during maximal vasodilation during PET and during catheterization. Percent area stenosis ranged from 40% to 94% (mean, 77±13%), myocardial fractional flow reserve from 0.36 to 0.98 (mean, 0.61±0.17), and relative flow reserve from 0.27 to 1.23 (mean, 0.60±0.26). A close correlation was found between relative flow reserve obtained by PET and both myocardial fractional flow reserve (r=.87) and coronary fractional flow reserve obtained by pressure recordings (r=.86). The correlations between relative flow reserve obtained by PET and stenosis measurements derived from quantitative coronary angiography were markedly weaker (minimal obstruction area, r=.66; percent area stenosis, r=-.70; and stenosis flow reserve, r=.68). Conclusions: Fractional flow reserve derived from pressure measurements correlates more closely to relative flow reserve derived from PET than angiographic parameters. This validates in humans the use of fractional flow reserve as an index of the physiological consequences of a given coronary artery stenosis.
AB - Background: Experimental studies have shown that fractional flow reserve (defined as the ratio of maximal achievable flow in a stenotic area to normal maximal achievable flow) can be calculated from coronary pressure measurements only. The objectives of this study were to validate fractional flow reserve calculation in humans and to compare this information with that derived from quantitative coronary angiography. Methods and Results: Twenty- two patients with an isolated, discrete proximal or mid left anterior descending coronary artery stenosis and normal left ventricular function were studied. Relative myocardial flow reserve, defined as the ratio of absolute myocardial perfusion during maximal vasodilation in the stenotic area to the absolute myocardial perfusion during maximal vasodilation (adenosine 140 μg · kg-1 · min-1 intravenously during 4 minutes) in the contralateral normally perfused area, was assessed by 15O-labeled water and positron emission tomography (PET). Myocardial and coronary fractional flow reserve were calculated from mean aortic, distal coronary, and right atrial pressures recorded during maximal vasodilation. Distal coronary pressures were measured by an ultrathin, pressure-monitoring guide wire with minimal influence on the transstenotic pressure gradient. Minimal obstruction area, percent area stenosis, and calculated stenosis flow reserve were assessed by quantitative coronary angiography. There was no difference in heart rate, mean aortic pressure, or rate-pressure product during maximal vasodilation during PET and during catheterization. Percent area stenosis ranged from 40% to 94% (mean, 77±13%), myocardial fractional flow reserve from 0.36 to 0.98 (mean, 0.61±0.17), and relative flow reserve from 0.27 to 1.23 (mean, 0.60±0.26). A close correlation was found between relative flow reserve obtained by PET and both myocardial fractional flow reserve (r=.87) and coronary fractional flow reserve obtained by pressure recordings (r=.86). The correlations between relative flow reserve obtained by PET and stenosis measurements derived from quantitative coronary angiography were markedly weaker (minimal obstruction area, r=.66; percent area stenosis, r=-.70; and stenosis flow reserve, r=.68). Conclusions: Fractional flow reserve derived from pressure measurements correlates more closely to relative flow reserve derived from PET than angiographic parameters. This validates in humans the use of fractional flow reserve as an index of the physiological consequences of a given coronary artery stenosis.
KW - angiography
KW - rate-pressure product
KW - tomography
UR - http://www.scopus.com/inward/record.url?scp=0028281838&partnerID=8YFLogxK
U2 - 10.1161/01.CIR.89.3.1013
DO - 10.1161/01.CIR.89.3.1013
M3 - Article
C2 - 8124786
AN - SCOPUS:0028281838
SN - 0009-7322
VL - 89
SP - 1013
EP - 1022
JO - Circulation
JF - Circulation
IS - 3
ER -