Correction for Gas Compression in Mechanical Ventilators

Forbat, Andrew F.; Her, Charles

doi:10.1213/00000539-198007000-00006

Cited by 26 publications

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“…In the volume-controlled ventilation (VCV) mode, gas compression and hygrometric conditions should be properly managed by the ventilators. 1 Dry (0% relative humidity) and cold (158C) gas must be conditioned to enter the lung as water-saturated (47 mm Hg and 100% relative humidity) and warmed (temperature close to 378C). Humidifying and heating the inspired gas mixture increases the gas volume.…”

Section: Accepted For Publication: 15 November 2012mentioning

confidence: 99%

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Wallon

Bonnet

Guérin

2013

British Journal of Anaesthesia

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Section: Accepted For Publication: 15 November 2012mentioning

confidence: 99%

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Wallon

Bonnet

Guérin

2013

British Journal of Anaesthesia

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“…In this group, instead of measuring right ventricular end-diastolic volume index, we also measured the VD/VT and used as an index of the distribution of V/Q. We collected mixed-expired gases with Douglas bag using Frumin valve [19] without losing the volume in the bellow of anesthesia ventilator, right after pulsatile gas flow measurement. The concentration of mixed-expired gases from a Douglas bag was measured with a mass spectrometer.…”

Section: Measurements Of Pulsatile Gas Flowmentioning

confidence: 99%

Change in pulmonary blood volume changes pulmonary artery systolic storage

Her

Kim

Jeon

2013

Journal of Surgical Research

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“…All metabolic analyzer measurements of P E CO 2 were corrected for circuit compression volume, as previously described, [23][24][25][27][28][29] whereby the P E CO 2 was multiplied by the ratio of the observed V T divided by the observed V T minus the calculated compression volume using the following equations:…”

Section: Metabolic Analyzer Measurementsmentioning

confidence: 99%

Calculation of Physiologic Dead Space: Comparison of Ventilator Volumetric Capnography to Measurements by Metabolic Analyzer and Volumetric CO₂ Monitor

et al. 2012

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BACKGROUND: Calculation of physiologic dead space (dead space divided by tidal volume [V D / V T ]) using the Enghoff modification of the Bohr equation requires measurement of the partial pressure of mean expired CO 2 (P E CO 2 ) by exhaled gas collection and analysis, use of a metabolic analyzer, or use of a volumetric CO 2 monitor. The Dräger XL ventilator is equipped with integrated volumetric CO 2 monitoring and calculates minute CO 2 production (V CO 2 ). We calculated P E CO 2 and V D /V T from ventilator derived volumetric CO 2 measurements of V CO 2 and compared them to metabolic analyzer and volumetric CO 2 monitor measurements. METHODS: A total of 67 measurements in 36 subjects recovering from acute lung injury or ARDS were compared. Thirty-one ventilator derived measurements were compared to measurements using 3 different metabolic analyzers, and 36 ventilator derived measurements were compared to measurements from a volumetric CO 2 monitor. RESULTS: There was a strong agreement between ventilator derived measurements and metabolic analyzer or volumetric CO 2 monitor measurements of P E CO 2 and V D /V T. The correlations, bias, and precision between the ventilator and metabolic analyzer measurements for P E CO 2 were r ‫؍‬ 0.97, r 2 ‫؍‬ 0.93 (P < .001), bias ؊1.04 mm Hg, and precision ؎ 1.47 mm Hg. For V D /V T the correlations were r ‫؍‬ 0.95 and r 2 ‫؍‬ 0.91 (P < .001), and the bias and precision were 0.02 ؎ 0.04. The correlations between the ventilator and the volumetric CO 2 monitor for P E CO 2 were r ‫؍‬ 0.96 and r 2 ‫؍‬ 0.92 (P < .001), and the bias and precision were ؊0.19 ؎ 1.58 mm Hg. The correlations between the ventilator and the volumetric CO 2 monitor for V D /V T were r ‫؍‬ 0.97 and r 2 ‫؍‬ 0.95 (P < .001), and the bias and precision were 0.01 ؎ 0.03. CONCLUSIONS: P E CO 2 , and therefore V D /V T , can be accurately calculated directly from the Dräger XL ventilator volumetric capnography measurements without use of a metabolic analyzer or volumetric CO 2 monitor.

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Correction for Gas Compression in Mechanical Ventilators

Cited by 26 publications

References 0 publications

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Change in pulmonary blood volume changes pulmonary artery systolic storage

Calculation of Physiologic Dead Space: Comparison of Ventilator Volumetric Capnography to Measurements by Metabolic Analyzer and Volumetric CO₂ Monitor

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Correction for Gas Compression in Mechanical Ventilators

Cited by 26 publications

References 0 publications

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Delivery of tidal volume from four anaesthesia ventilators during volume-controlled ventilation: a bench study

Change in pulmonary blood volume changes pulmonary artery systolic storage

Calculation of Physiologic Dead Space: Comparison of Ventilator Volumetric Capnography to Measurements by Metabolic Analyzer and Volumetric CO2 Monitor

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Calculation of Physiologic Dead Space: Comparison of Ventilator Volumetric Capnography to Measurements by Metabolic Analyzer and Volumetric CO₂ Monitor