Impact of Hydrostatic Pressure Variations Caused by Height Differences in Supine and Prone Positions on Fractional Flow Reserve Values in the Coronary Circulation

Figure 2

Height differences between Pa and Pd measurement by heart CT. Pa site was positioned at the ostium of the coronary artery on the CT image, and using side branches or tortuous parts as a landmark, Pd site was decided on the CT image. Two CT images matching the heights from the CT table were aligned, and the height differences between Pa and Pd were measured. CT, coronary tomography; Pa, mean aortic pressure; Pd, mean distal intracoronary pressure.