Reliability and source of errors in end-tidal gas concentration evaluation algorithms during avalanche snow and rebreathing experiments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F17%3A00317633" target="_blank" >RIV/68407700:21460/17:00317633 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Reliability and source of errors in end-tidal gas concentration evaluation algorithms during avalanche snow and rebreathing experiments

Popis výsledku v původním jazyce

During breathing experiments in avalanche snow, measurement of CO2 is often conducted in order to monitor the volunteers or as an endpoint of the trial. From the measured CO2 signal, monitors calculate end-tidal CO2 concentrations (EtCO2). The aim of the study was to investigate several related points: to determine if the Datex-Ohmeda S/5 anesthesia monitor evaluates EtCO2 and other parameters of breathing gas correctly, to characterize the frequency and magnitude of error and to determine the possible cause of the error. Data from a previous experiment aimed at investigation of work of breathing into snow in the presence and absence of an artificial air pocket were used to study accuracy of the monitor. The analysis found that an error of EtCO2 occurred in 39% and in 30% of the total experimental time of breathing, with and without the air pocket respectively (range from 13% to 93% of time). Breathing experiments with simulated snow were conducted in order to find the cause of the error. We determined the error occurs immediately after a significant increase of CO2 in the breathing circuit as a consequence of expired gas rebreathing and is independent of other breathing parameters. The study confirmed that a newer model monitor (CARESCAPE B650) is prone to this error as well. The last experiment conducted with a standard anesthesia machine confirmed, that the error occurs even in a standard clinical setup in the presence of rebreathing. This problem might result in improper actions and could potentially result in harm to a volunteer or a patient.

Název v anglickém jazyce

Reliability and source of errors in end-tidal gas concentration evaluation algorithms during avalanche snow and rebreathing experiments

Popis výsledku anglicky

During breathing experiments in avalanche snow, measurement of CO2 is often conducted in order to monitor the volunteers or as an endpoint of the trial. From the measured CO2 signal, monitors calculate end-tidal CO2 concentrations (EtCO2). The aim of the study was to investigate several related points: to determine if the Datex-Ohmeda S/5 anesthesia monitor evaluates EtCO2 and other parameters of breathing gas correctly, to characterize the frequency and magnitude of error and to determine the possible cause of the error. Data from a previous experiment aimed at investigation of work of breathing into snow in the presence and absence of an artificial air pocket were used to study accuracy of the monitor. The analysis found that an error of EtCO2 occurred in 39% and in 30% of the total experimental time of breathing, with and without the air pocket respectively (range from 13% to 93% of time). Breathing experiments with simulated snow were conducted in order to find the cause of the error. We determined the error occurs immediately after a significant increase of CO2 in the breathing circuit as a consequence of expired gas rebreathing and is independent of other breathing parameters. The study confirmed that a newer model monitor (CARESCAPE B650) is prone to this error as well. The last experiment conducted with a standard anesthesia machine confirmed, that the error occurs even in a standard clinical setup in the presence of rebreathing. This problem might result in improper actions and could potentially result in harm to a volunteer or a patient.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20601 - Medical engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Lékař a technika

ISSN

0301-5491

e-ISSN

2336-5552

Svazek periodika

47

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

73-80

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85038878996