Safety and Feasibility Using a Fluid-Filled Wire to Avoid Hydrostatic Errors in Physiological Intracoronary Measurements

Figure 5

Correlation between indices derived using the fluid-filled versus sensor-tipped wires. The correlation for both Pd/Pa (a) and fractional flow reserve (FFR) (b) between the two wires was greater when the hydrostatic error due to height was accounted for (right versus left). Passing-Bablok regression indicates that a small proportional bias was present between FFR derived using the fluid-filled wire versus the sensor-tipped wire after correction for hydrostatic pressure (slope 1.14 (95% CI) [1.01–1.38]) but not in the other comparisons.

(a)

(b)