Abstract: In  recent years,  the evaluation of organ hemodynamics has gradually become a hot topic. As one of the most vulnerable organs to shock,  the hemodynamic evaluation of kidney has been paid more and more attention. Because of its dynamic,  realtime and repeatable characteristics,  critical ultrasound can take into account of structure and perfusion,  and it provide a new concept and method for the evaluation of organ hemodynamics in critically ill patients. This paper focuses on the application and significance of critical ultrasound in renal hemodynamic evaluation,  including pulse Doppler renal resistance index,  color Doppler flow imaging combined with color flow quantitative technique and contrastenhanced ultrasound and other content.

Key words: critical care, ultrasonography, kidney, hemodynamics