Objective  This study aimed to discuss the diagnostic value of the resistance index (RI) of the renal interlobar artery measured by color Doppler ultrasound in patients with type 1 cardiorenal syndrome(CRS).

  Methods  Twenty patients with type 1 CRS diagnosed in emergency wards were defined as group CRS; 20 patients diagnosed as heart failure in the same period were defined as the control group. Clinical features, laboratory examination and medication of the two groups were analyzed. The RI of the two groups of patients was measured. The diagnostic value of RI in type 1 CRS was evaluated according to the receiver operat-ing characteristic(ROC) curve.

  Results  There was no significant difference in age, left ventricular ejection fraction (LVEF), heart rate, pulse arterial pressure, and cardiac function classification between the two groups(all P>0.05). The level of N-terminal pro-brain natriuretic peptide, creatitine, and RI of CRS group were higher than those in the control group; the glomerular filtration rate in group CRS was lower than that in the control group, and the difference was statistically significant (all P < 0.05). The area under the ROC curve was 0.78 and the best cut-off point was 0.70. The sensitivity was 80% and the specificity was 80%.

  Conclusions  As a new means, the RI of the renal interlobar artery can complement traditional methods and has a potential value in the diagnosis of type 1 CRS.