Angiographic image of the angioplasty-balloon-occluded left superficial femoral artery (SFA; left panel), which is partly filled with radiographic contrast.

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Angiographic image of the angioplasty-balloon-occluded left superficial femoral artery (SFA; left panel), which is partly filled with radiographic contrast medium via collaterals. Angiographic image of the angioplasty-balloon-occluded left superficial femoral artery (SFA; left panel), which is partly filled with radiographic contrast medium via collaterals. Distal to the occlusive balloon, a pressure-sensor-guide wire is placed with the sensor located at the junction between the opaque and the more transparent part of the wire. During the imaged SFA occlusion, the following phasic and mean pressure curves are simultaneously recorded for SFA collateral flow index (CFI) measurement (right panel): aortic pressure (Pao, red curve), SFA distal occlusive pressure (Poccl, black curve), and central venous pressure (CVP, black curve). SFA CFI=(Poccl-CVP)/(Pao-CVP). Michael Stoller et al. Open Heart 2016;3:e000355 ©2016 by British Cardiovascular Society