CLINICAL STUDIES
Coronary collateral quantitation in patients with coronary artery disease using intravascular flow velocity or pressure measurements
Christian Seiler, MD, FACCa,
Martin Fleisch, MDa,
Ali Garachemani, MDa and
Bernhard Meier, MD, FACCa
a Department of Cardiology, University Hospital, Bern, Switzerland
Manuscript received February 19, 1998;
revised manuscript received June 17, 1998,
accepted July 2, 1998.
Address for correspondence: Dr. Christian Seiler, Department of Cardiology, University Hospital, Inselspital, Freiburgstrasse, Bern, Switzerland christian.seiler{at}insel.ch
Objectives. This study evaluated two methods for the quantitative measurement of collaterals using intracoronary (IC) blood flow velocity or pressure measurements.
Background. The extent of myocardial necrosis after coronary artery occlusion is substantially influenced by the collateral circulation. So far, qualitative methods have been available to assess the human coronary collateral circulation, thus restraining the conclusive investigation of, for example, therapies to promote collateral development.
Methods. Fifty-one patients with a coronary artery stenosis to be treated by percutaneous transluminal coronary angioplasty (PTCA) were investigated using IC PTCA guidewire-based Doppler and pressure sensors positioned distal to the stenosis. Simultaneous measurements of aortic pressure, IC velocity and pressure distal to the stenosis during and after PTCA provided the variables for calculating collateral flow indices (CFIv and CFIp) that express collateral flow as a fraction of flow via the patent vessel. Both CFIv and CFIp were compared with conventional methods for collateral assessment, among them ST-segment changes >1 mm on IC and surface electrocardiogram (ECG) at PTCA. Also, CFIv and CFIp were compared with each other.
Results. In 11 patients without ECG signs of ischemia during PTCA (sufficient collaterals), relative collateral flow amounted to 46% as determined by Doppler and pressure wire. Patients with insufficient collaterals (n = 40) had relative collateral flow values of 18%. Using a threshold of CFI = 30%, sufficient and insufficient collaterals could be diagnosed with 100% sensitivity and 93% specificity by IC Doppler, and 75% sensitivity and 92% specificity by IC pressure measurements. The agreement between Doppler and pressure measurements was good: CFIv = 0.08 + 0.8 CFIp, r = 0.80, p = 0.0001.
Conclusions. Intracoronary flow velocity or pressure measurements during routine PTCA represent an accurate and, at last, quantitative method for assessing the coronary collateral circulation in humans.
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Abbreviations and Acronyms
| | CAD | = coronary artery disease | | CFIp | = pressure-derived collateral flow index | | CFIv | = velocity-derived collateral flow index | | CFVR | = coronary flow velocity reserve | | CVP | = central venous pressure | | IC | = intracoronary | | Pao | = mean aortic pressure | | Poccl | = distal IC occlusive or coronary wedge pressure | | PTCA | = percutaneous transluminal coronary angioplasty | | Vioccl | = flow velocity time integral obtained distal to the occluded stenosis | | Viø-occl | = flow velocity time integral obtained distal to the dilated stenosis |
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C. Whan Lee, S.-W. Park, G.-Y. Cho, M.-K. Hong, J.-J. Kim, D.-H. Kang, J.-K. Song, H.-J. Lee, and S.-J. Park
Pressure-derived fractional collateral blood flow: a primary determinant of left ventricular recovery after reperfused acute myocardial infarction
J. Am. Coll. Cardiol.,
March 15, 2000;
35(4):
949 - 955.
[Abstract]
[Full Text]
[PDF]
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C. Seiler, M. Fleisch, M. Billinger, and B. Meier
Simultaneous intracoronary velocity- and pressure-derived assessment of adenosine-induced collateral hemodynamics in patients with one- to two-vessel coronary artery disease
J. Am. Coll. Cardiol.,
December 1, 1999;
34(7):
1985 - 1994.
[Abstract]
[Full Text]
[PDF]
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M. Fleisch, M. Billinger, F. R. Eberli, A. R. Garachemani, B. Meier, and C. Seiler
Physiologically Assessed Coronary Collateral Flow and Intracoronary Growth Factor Concentrations in Patients With 1- to 3-Vessel Coronary Artery Disease
Circulation,
November 9, 1999;
100(19):
1945 - 1950.
[Abstract]
[Full Text]
[PDF]
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C. Seiler
Human Basic Fibroblast Growth Factor Induces Angiogenesis in Hen Eggs and Rat Hearts
Circulation,
September 14, 1999;
100
(11):
1250 - 1252.
[Full Text]
[PDF]
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M. Billinger, M. Fleisch, F. R. Eberli, A. Garachemani, B. Meier, and C. Seiler
Is the development of myocardial tolerance to repeated ischemia in humans due to preconditioning or to collateral recruitment?
J. Am. Coll. Cardiol.,
March 15, 1999;
33(4):
1027 - 1035.
[Abstract]
[Full Text]
[PDF]
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H. Matsuo, S. Watanabe, T. Kadosaki, T. Yamaki, S. Tanaka, S. Miyata, T. Segawa, Y. Matsuno, M. Tomita, and H. Fujiwara
Validation of Collateral Fractional Flow Reserve by Myocardial Perfusion Imaging
Circulation,
March 5, 2002;
105(9):
1060 - 1065.
[Abstract]
[Full Text]
[PDF]
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