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. 2017 May 31;10(6):e004990. doi: 10.1161/CIRCINTERVENTIONS.116.004990

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© 2017 The Authors.

Circulation: Cardiovascular Interventions is published on behalf of the American Heart Association, Inc., by Wolters Kluwer Health, Inc. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial-NoDerivs License, which permits use, distribution, and reproduction in any medium, provided that the original work is properly cited, the use is noncommercial, and no modifications or adaptations are made.

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Figure 2. — Left, Simultaneous recording of phasic and mean aortic pressure (P_ao, red curve), ostial right coronary artery (RCA) occlusive pressure (P_occl, black curve), central venous pressure (CVP, blue curve), and intracoronary ECG (bottom, black curve) as obtained during baseline examination. Coronary balloon occlusion starts at ≈2 seconds on the time scale (horizontal axis) and lasts until 79 seconds (up-slope of P_occl). P_ao, P_occl, and CVP are taken as temporal mean values between the arrowheads: collateral flow index, CFI=(P_occl−CVP)/(P_ao−CVP)=(18.8−12.5)/(92.6−12.5)=0.079. Right, Simultaneous recording of phasic and mean P_ao, ostial RCA P_occl, CVP, and intracoronary ECG during follow-up examination in the same patient as in the left panel. CFI=0.190.