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The ICALIC Accuracy Validation in Geneva Study — ICALIC  

Critical Illness Clinical Trial

Official title:
Clinical Evaluation of the Ease of Use of a New Indirect Calorimeter for Energy Expenditure Measurement in ICU Patients: The ICALIC International Multicentric Study

Clinical Trial Summary

This study aims at validating the accuracy of the new indirect calorimeter (Q-NRG, COSMED, Italy), developed for the ICALIC multicenter study. The validation of accuracy will only be conducted in Geneva center.

The measurements made with the new calorimeter will be compared to the measurements by the mixing chamber method using a mass spectrometer (MAX300-LG, Extrel, USA) for gas composition analysis.

Clinical Trial Description

Indirect calorimetry is a method to measure energy expenditure of human subjects by analyzing patient breath gas to measure the amount (volume) of oxygen consumption (VO2) and CO2 production (VCO2). Energy expenditure is calculated by the Weir's equation using the measured VO2 and VCO2 values.

The new calorimeter is equipped with a disposable in-line pneumotach flowmeter, which measures the flow of exhaled gas of patients directly within the mechanical ventilator circuit. It also samples small amount of inhaled and exhaled gas to measure the inhaled and exhaled O2 and CO2 compositions. The new dynamic micro-mixing chamber technique is used to meaure VO2 and VCO2 to derive the energy expenditure.

The mass spectrometer measures the inhaled and exhaled gas compositions. The mass spectrometer samples inhaled gas from the mechanical ventilator circuit. A mixing chamber system is used to collect the expired gas from the outlet of the mechanical ventilator. The collected gas is measured for the second time after diluting with a constant flow of ambient air, which is monitored by an independent mass flow meter. The volume of the expired gas is calculated by comparison of the concentrations of exhaled gas before and after the dilution. The measurements will be used to calculate the VO2 and VCO2 to derive the energy expenditure. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT02790697
Study type Observational
Source University Hospital, Geneva
Contact Taku Oshima, MD ,PhD
Phone +41 79 5534780
Email Oshima.Taku@hcuge.ch
Status Recruiting
Phase
Start date September 10, 2017
Completion date December 31, 2019
View Details
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