European Heart Journal Advance Access originally published online on October 5, 2005
European Heart Journal 2006 27(2):157-165; doi:10.1093/eurheartj/ehi585
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Collateral-flow measurements in humans by myocardial contrast echocardiography: validation of coronary pressure-derived collateral-flow assessment
Department of Cardiology, University Hospital Bern, CH-3010 Bern, Switzerland
Received 13 June 2005; revised 28 July 2005; accepted 22 September 2005; online publish-ahead-of-print 5 October 2005.
* Corresponding author. Tel: +41 31 6323693; fax: +41 31 6324299. E-mail address: christian.seiler.cardio{at}insel.ch
See page 123 for the editorial comment on this article (doi:10.1093/eurheartj/ehi640)
Aims Myocardial blood flow (MBF) is the gold standard to assess myocardial blood supply and, as recently shown, can be obtained by myocardial contrast echocardiography (MCE). The aims of this human study are (i) to test whether measurements of collateral-derived MBF by MCE are feasible during elective angioplasty and (ii) to validate the concept of pressure-derived collateral-flow assessment.
Methods and results Thirty patients with stable coronary artery disease underwent MCE of the collateral-receiving territory during and after angioplasty of 37 stenoses. MCE perfusion analysis was successful in 32 cases. MBF during and after angioplasty varied between 0.0600.876 mL min1 g1 (0.304±0.196 mL min1 g1) and 0.6761.773 mL min1 g1 (1.207±0.327 mL min1 g1), respectively. Collateral-perfusion index (CPI) is defined as the rate of MBF during and after angioplasty varied between 0.05 and 0.67 (0.26±0.15). During angioplasty, simultaneous measurements of mean aortic pressure, coronary wedge pressure, and central venous pressure determined the pressure-derived collateral-flow index (CFIp), which varied between 0.04 and 0.61 (0.23±0.14). Linear-regression analysis demonstrated an excellent agreement between CFIp and CPI (y=0.88x+0.01; r2=0.92; P<0.0001).
Conclusion Collateral-derived MBF measurements by MCE during angioplasty are feasible and proved that the pressure-derived CFI exactly reflects collateral relative to normal myocardial perfusion in humans.
Key Words: Coronary circulation Collateral circulation Collateral flow index Myocardial blood flow Myocardial perfusion Myocardial contrast echocardiography
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