Renal Tubular Acidosis is Highly Prevalent in Critically Ill Patients

Completed

• Conditions: Acidosis, Renal Tubular

• Registration Number: NCT02392091
• Lead Sponsor: Medical University of Vienna

Brief Summary

The aim of this study was to investigate the prevalence, type, and possible risk factors of RTA in critically ill patients using a physical-chemical approach.

Detailed Description

Hyperchloremic acidosis is frequent in critically ill patients. Renal tubular acidosis (RTA) may contribute to acidemia in the state of hyperchloremic acidosis, but the prevalence of RTA has never been studied in critically ill patients. Therefore, we aimed to investigate the prevalence, type, and possible risk factors of RTA in critically ill patients using a physical-chemical approach.

This prospective, observational trial was conducted in a medical ICU of a university hospital. 100 consecutive critically ill patients at the age ≥18, expected to stay in the ICU for ≥24h, with the clinical necessity for a urinary catheter and the absence of anuria were included.

Base excess subset calculation based on a physical-chemical approach on the first seven days after ICU admission was used to compare the effects of free water, chloride, albumin, and unmeasured anions on the standard base excess. Calculation of the urine osmolal gap (UOG) - as an approximate measure of the unmeasured urine cation ammonium - served as determinate between renal and extra-renal bicarbonate loss in the state of hyperchloremic acidosis.

Study Timeline

• Study Start: 2011-04
• Primary Completion: 2011-10
• Study Completion: 2012-03
• Status Verified: 2015-03
• Study First Submitted: 2015-03-12
• Study First Submitted QC: 2015-03-17
• Last Update Submitted: 2015-03-17
• Study First Posted: 2015-03-18
• Last Update Posted: 2015-03-18

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 100

Inclusion Criteria

• admitted to the medical ICU of the Div. of Gastroenterology & Hepatology of the Medical University of vienna
• age ≥18
• expectancy to stay in the ICU ≥24hours
• clinical necessity for a urinary catheter

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Exclusion Criteria

• anuria

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
renal-tubular acidosis	up to 7 days after ICU admission	Diagnosis of renal-tubular acidosis in critically ill patients within 7 days after ICU admission.