Assessment of Angiography-Based Renal Quantitative Flow Ratio Measurement in Patients with Atherosclerotic Renal Artery Stenosis

Figure 3

Representative examples of rQFR and rFFR assessments in our study. (a) A 63-year-old male was admitted due to hypertension with mild renal insufficiency. Due to renal artery duplex scanning which revealed that the resistance index of the left renal artery elevated to 0.81 (normal: 0.055-0.70), we performed selective renal angiography. QFR software automatic identified the stenosis in the proximal portion of the left renal artery (I). The QFR software analysis shows that diameter stenosis rate was 51%, minimal lumen diameter was 2.5 mm, reference vessel diameter was 5.1 mm, and rQFR was computed as 0.87 (II), while the invasive rFFR measured by pressure wire was 0.86 (III). (b) A 53-year-old female with resistant hypertension and unilateral renal atrophy underwent renal angiography. QFR software also automatically identified the stenosis in the proximal portion of the right renal artery (I). The QFR software analysis shows that diameter stenosis rate was 60%, reference vessel diameter was 7.1 mm, minimal lumen diameter was 2.8 mm, and rQFR was computed as 0.77 with a remarkable pressure drop (II), while the invasive rFFR measured by pressure wire was 0.75 (III).

(a)

(b)