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. 2021 Oct 19;8:765071. doi: 10.3389/fcvm.2021.765071

Figure 1.

Figure 1

Example of tracings of phasic and mean central aortic pressure (Pa), distal coronary pressure (Pd) and thermodilution during the infusion of 10 mL/min (A) and of 20 mL/min (B) in the LAD of a 77-year-old male patients with mild wall irregularities. (A) after the start and during the next 70 s of the infusion of saline at 10 mL/min through the RayFlowTM catheter located in the proximal LAD, no changes in Pd / Pa were observed. Resting flow is 67 mL/min. (B) in contrast, after the start and during the next 70 s, the infusion of saline at 20 mL/min through the RayFlowTM catheter located in the proximal LAD, was paralleled by a decrease in Pd and in Pd/Pa. Hyperemic flow is 230 mL/min. CFR and MRR are 3.43 and 4.03 respectively. Q, Absolute Flow; Qnorm, Normalized Absolute Flow (Q/FFR); R, Absolute Microvascular Resistance; CFR, Coronary Flow Reserve; MRR, Microvascular resistance Reserve.