scholarly journals Partial Pressure of Carbon Dioxide Measurement

2020 ◽  
Author(s):  
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Carbon Dioxide Measurement

scholarly journals Accuracy of Transcutaneous Carbon Dioxide Measurement in Premature Infants

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Marie Janaillac ◽  
Sonia Labarinas ◽  
Riccardo E. Pfister ◽  
Oliver Karam
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Premature Infants ◽  
Gestational Age ◽  
Neonatal Intensive Care ◽  
Clinical Decision Making ◽  
Clinical Decision ◽  
Wide Limit ◽  
Cerebral Lesions ◽  
Carbon Dioxide Measurement

Background.In premature infants, maintaining blood partial pressure of carbon dioxide (pCO2) value within a narrow range is important to avoid cerebral lesions. The aim of this study was to assess the accuracy of a noninvasive transcutaneous method (TcpCO2), compared to blood partial pressure of carbon dioxide (pCO2).Methods.Retrospective observational study in a tertiary neonatal intensive care unit. We analyzed the correlation between blood pCO2and transcutaneous values and the accuracy between the trends of blood pCO2and TcpCO2in all consecutive premature infants born at <33 weeks’ gestational age.Results.248 infants were included (median gestational age: 29 + 5 weeks and median birth weight: 1250 g), providing 1365 pairs of TcpCO2and blood pCO2values. Pearson’sRcorrelation between these values was 0.58. The mean bias was −0.93 kPa with a 95% confidence limit of agreement of −4.05 to +2.16 kPa. Correlation between the trends of TcpCO2and blood pCO2values was good in only 39.6%.Conclusions.In premature infants, TcpCO2was poorly correlated to blood pCO2, with a wide limit of agreement. Furthermore, concordance between trends was equally low. We warn about clinical decision-making on TcpCO2alone when used as continuous monitoring.

Buccal partial pressure of carbon dioxide outweighs traditional vital signs in predicting the severity of hemorrhagic shock in a rat model

2014 ◽  
Vol 187 (1) ◽  
pp. 262-269 ◽  
Author(s):  
Hengzhi Lu ◽  
Jiewen Zheng ◽  
Peng Zhao ◽  
Guang Zhang ◽  
Taihu Wu
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Hemorrhagic Shock ◽  
Rat Model ◽  
Vital Signs

scholarly journals The Effect of the Temperature and Moisture to the Permeation Properties of PEO-Based Membranes for Carbon-Dioxide Separation

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2053
Author(s):  
Dragutin Nedeljkovic
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Carbon Dioxide Emission ◽  
Combustion Products ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Gas Treatment ◽  
Carbon Dioxide Separation ◽  
Different Temperatures

An increased demand for energy in recent decades has caused an increase in the emissions of combustion products, among which carbon-dioxide is the most harmful. As carbon-dioxide induces negative environmental effects, like global warming and the greenhouse effect, a decrease of the carbon-dioxide emission has emerged as one of the most urgent tasks in engineering. In this work, the possibility for the application of the polymer-based, dense, mixed matrix membranes for flue gas treatment was tested. The task was to test a potential decrease in the permeability and selectivity of a mixed-matrix membrane in the presence of moisture and at elevated temperature. Membranes are based on two different poly(ethylene oxide)-based polymers filled with two different zeolite powders (ITR and IWS). An additive of detergent type was added to improve the contact properties between the zeolite and polymer matrix. The measurements were performed at three different temperatures (30, 60, and 90 °C) under wet conditions, with partial pressure of the water equal to the vapor pressure of the water at the given temperature. The permeability of carbon-dioxide, hydrogen, nitrogen, and oxygen was measured, and the selectivity of the carbon-dioxide versus other gases was determined. Obtained results have shown that an increase of temperature and partial pressure of the vapor slightly increase both the selectivity and permeability of the synthesized membranes. It was also shown that the addition of the zeolite powder increases the permeability of carbon-dioxide while maintaining the selectivity, compared to hydrogen, oxygen, and nitrogen.

scholarly journals Infrared Hollow Optical Fiber Probe for Localized Carbon Dioxide Measurement in Respiratory Tracts

Sensors ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 995 ◽  
Author(s):  
Takashi Katagiri ◽  
Kyosuke Shibayama ◽  
Takeru Iida ◽  
Yuji Matsuura
Keyword(s):  
Carbon Dioxide ◽  
Optical Fiber ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
Carbon Dioxide Measurement

Effect of vegetation on limestone solution in a small High Arctic basin

1977 ◽  
Vol 14 (4) ◽  
pp. 571-581 ◽  
Author(s):  
Ming-Ko Woo ◽  
Philip Marsh
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Soil Water ◽  
Water Hardness ◽  
Late Summer ◽  
Arctic Basin ◽  
The Arctic ◽  
Total Hardness ◽  
Equilibrium Partial Pressure ◽  
Biogenic Carbon

To evaluate the effect of tundra vegetation on limestone solution processes, the present study was carried out in a small basin in southwestern Ellesmere Island, N.W.T. A test reach was selected along the stream, and water samples were collected at regular intervals from a seepage point entering the reach, a soil water pit at the bottom of a vegetated slope along the test reach, and from the stream at the outlet of the reach. Hydrochemical characteristics of the samples were described by several measured and calculated variables including water temperature, pH, calcium and total hardness, bicarbonate concentration, equilibrium partial pressure of carbon dioxide, and indices of saturation with respect to calcite and dolomite. Throughout the growing season of 1975, all samples indicated higher concentrations in water hardness and in bicarbonate than those reported in nonvegetated areas of the Arctic. A rising trend was apparent in these data, with the concentrations reaching a seasonal maximum in late summer. These phenomena are attributed to the production of biogenic carbon dioxide, which increased the aggressiveness of the water. The partial pressure of carbon dioxide in soil water was directly increased by this process, while the addition of soil water to the stream caused noticeable downstream increase in partial pressure of carbon dioxide and a corresponding reduction in saturation with respect to calcite and to dolomite. The influence of vegetation was therefore very marked in both surface and in subsurface flows.

Carbon dioxide measurement: a coulometric method for use in photosynthesis experiments

1971 ◽  
Vol 4 (12) ◽  
pp. 1016-1018 ◽  
Author(s):  
A F Milward ◽  
E J Skerrett
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Measurement ◽  
Coulometric Method
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