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Annals of Intensive Care
Published in: Annals of Intensive Care 1/2019

Open Access 01-12-2019 | Acute Kidney Injury | Research

Factors associated with renal Doppler resistive index in critically ill patients: a prospective cohort study

Authors: Raphael A. G. Oliveira, Pedro V. Mendes, Marcelo Park, Leandro U. Taniguchi

Published in: Annals of Intensive Care | Issue 1/2019

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Abstract

Background

The renal Doppler resistive index (renal RI) is a noninvasive tool that has been used to assess renal perfusion in the intensive care unit (ICU) setting. However, many parameters have been described as influential on the values of renal RI. Therefore, we proposed this study to evaluate the variables that could impact renal RI in critically ill patients.

Methods

A prospective observational study was performed in a 14-bed medical–surgical adult ICU. All consecutive patients admitted to the ICU during the study period were evaluated for eligibility. Renal RI was performed daily until the third day after ICU admission, death, or renal replacement therapy (RRT) requirement. Clinical and blood test data were collected throughout this period. Acute kidney injury (AKI) reversibility was categorized as transient (normalization of renal function within 3 days of AKI onset) or persistent (non-resolution of AKI within 3 days of onset or need for RRT). A linear mixed model was applied to evaluate the factors that could influence renal RI.

Results

Eighty-three consecutive patients were included. Of these, 65% were male and 50.6% were medical admissions. Mean SAPS 3 was 47 ± 16. Renal RI was significantly different between no-AKI (0.64 ± 0.06), transient AKI (0.64 ± 0.07), and persistent AKI groups (0.70 ± 0.08, p < 0.01). Variables associated with renal RI variations were mean arterial pressure, lactate, age, and persistent AKI (p < 0.05). No association between serum chloride and renal RI was observed (p = 0.868).

Conclusions

Mean arterial pressure, lactate, age, and type of AKI might influence renal RI in critically ill patients.
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Metadata
Title
Factors associated with renal Doppler resistive index in critically ill patients: a prospective cohort study
Authors
Raphael A. G. Oliveira
Pedro V. Mendes
Marcelo Park
Leandro U. Taniguchi
Publication date
01-12-2019
Publisher
Springer International Publishing
Published in
Annals of Intensive Care / Issue 1/2019
Electronic ISSN: 2110-5820
DOI
https://doi.org/10.1186/s13613-019-0500-4

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