980 Renal Resistive Index at the Level of Renal Arcuate Artery as a Predictor of Natriuresis in Cirrhotic Patients

Abstract

INTRODUCTION: It has been postulated that the vasoconstriction at the level of renal arcuate artery plays a key role in the development of Hepatorenal syndrome(HRS). However, the measure of renal resistive index at the level of renal arcuate artery can provide a direct measure of renal hemodynamics among cirrhotics. The aim of this study is to determine the difference in the renal resistive index amongst both compensated as well as decompensated cirrhotics and to evaluate its association with natriuresis. METHODS: This prospective study included all consecutive cirrhotic patients visited gastroenterology clinic of our hospital from May 2018 to May 2019. After obtaining informed consent, the demographic parameters were noted along with a detailed drug history (Dose and duration of diuretics and beta blocker). Later on an ultrasound abdomen was also performed for documenting the features of chronic liver disease and the renal resistive index was noted. These patients were then stratified into two groups i.e. compensated cirrhosis and decompensated cirrhosis. Chi square test was applied and P value was calculated. RESULTS: A total of 60 patients were included in the study. The mean age of the patients was 40.3 ± 18.1, and were predominantly males 31(51.7%). Hepatitis C was the most common etiology for liver disease seen in 22 patients (36.7%).The mean CTP score, MELD and MELD sodium score were as follows: 7.9 ± 1.93, 15.2 ± 6.6 and 13.3 ± 4.2 respectively. Compensated liver disease was present in 16(26.7%) patients, while decompensated liver disease was present in 44(73.3%) patients. Mean renal resistive index of patient with compensated cirrhosis was 0.59 ± 0.04, while with decompensated cirrhosis was 0.62 ± 0.04. Patients with a higher RI had poor natriuresis as manifested by low urinary sodium potassium ratio < 1.0 and AROC is 0.775. At the cut off value of RI = 0.615 sensitivity, specificity, positive predictive value and negative predictive value for nartriuresis was 65.0%, 70.0%, 73.3% and 60.1% respectively. Patient with higher RI value were having decompensated cirrhosis (P = 0.06, 0.62 vs 0.59) CONCLUSION: The renal resistive index at the level of arcuate artery were found to be higher among patients with decompensated cirrhosis. At a higher RI value ( >0.615) patients had poor natriuresis. Therefore, RI can be used to predictor of natriuresis among cirrhotic patients. Key words: