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The instantaneous hyperemic pressure-flow relationship in conscious humans

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Progress in quantitative coronary arteriography

Part of the book series: Developments in Cardiovascular Medicine ((DICM,volume 155))

Summary

Background. The limitations and inaccuracies in the measurement of stenosis geometry, especially after coronary interventions, have prompted investigators to use functional indexes of stenosis severity, assessing the reduction of flow induced by the stenosis under study. Coronary flow reserve is greatly affected by the hemodynamic conditions at the time of the measurement and can not be applied for the immediate assessment of the results of coronary interventions.

Aim of the study. In this study the instantaneous relation between coronary flow velocity and pressure in the diastolic phase has been assessed during maximal hyperemia in normal or near-normal coronary arteries (<30% diameter stenosis) in 52 patients and in arteries with ≥30% diameter stenosis in 24 patients.

Methods. The instantaneous peak coronary flow velocity measured with a Doppler guidewire was plotted against the simultaneously measured proximal coronary pressure, recorded through the guiding catheter. The phase of progressive flow reduction in mid-late diastole was selected in 4 consecutive cardiac cycles at the maximal effect of 8–12.5 mg of papaverine intracoronary. To study the possibility to determine the zero-flow pressure from the intercept of the velocity-pressure relation on the pressure axis, a controlled diastolic cardiac arrest was induced by an intracoronary bolus injection of 3 mg of adenosine in 9 cardiac transplant recipients.

Results. The slope of the instantaneous hyperemic diastolic flow velocity-pressure relation (IHDVPS) could be assessed in 44/52 patients with <30% diameter stenosis (85%) and in 15/24 patients with ≥30% diameter stenosis (62%). The presence of a flat diastolic flow velocity curve precluded the assessment of the IHDVPS in the patients with the most severe stenoses. The measurement of IHDVPS was highly reproducible (interobserver difference =± 1%) and showed a moderate beat-to-beat variability (15 ± 7%) The IHDVPS showed no significant correlation with heart rate, mean diastolic aortic pressure, left ventricular +dP/dt, Vmax, -dP/dt and τ1, type of vessel studied and cross-sectional area at the site of the velocity recording. The IHDVPS was significantly lower in arteries with ≥30% diameter stenosis than in normal arteries (0.77 ± 0.52 versus 1.65 ± 0.71 cm s-1 mmHg-1, p<0.0001).

The study of the velocity-pressure relation during long diastolic pauses showed a curvilinear relation in the lower pressure range between velocity and pressure, with an upwards concavity to the velocity axis and no intercept with the pressure axis in most cases.

Conclusion, The instantaneous flow velocity-pressure relation during maximal hyperemia can be reliably assessed using intracoronary Doppler in the Catheterization Laboratory, has a low inter-observer variability and a moderate beat-to-beat variability, is independent from heart rate, aortic pressure or indexes of left ventricular contractility-relaxation at the time of the assessment. The slope of this relation can distinguish arteries with and without significant coronary stenoses, suggesting that this index is a potential alternative to coronary flow reserve for the assessment of stenosis severity before and after coronary interventions. The curvilinearity of the velocity-pressure relation during long diastolic pauses, possibly due to a significant reduction of luminal cross-sectional area at low pressures, precludes the use of the flow velocity-pressure relation for the assessment of the zero-flow pressure.

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Di Mario, C., Krams, R., Gil, R., Meneveau, N., Serruys, P.W. (1994). The instantaneous hyperemic pressure-flow relationship in conscious humans. In: Reiber, J.H.C., Serruys, P.W. (eds) Progress in quantitative coronary arteriography. Developments in Cardiovascular Medicine, vol 155. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1172-0_16

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  • DOI: https://doi.org/10.1007/978-94-011-1172-0_16

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