Venous excess ultrasound: A mini-review and practical guide for its application in critically ill patients

Figure 9 Examples of the renal vein Doppler waveform. Renal interlobar or arcuate veins are the optimal Doppler sampling sites while performing Venous Excess Ultrasound grading assessments for renal veins. A: Normal renal vein doppler waveform which is monophasic throughout the cardiac cycle; B: Congested renal vein will exhibit a discontinuous biphasic flow with distinct systole and diastole phases; C: Renal interlobar vein.