Microsensor characterization in an integrated blood gas measurement system

2003 ◽  
Author(s):  
S. Swaminathan ◽  
S.M. Krishnan ◽  
Lim Wee Khiang ◽  
Z. Ahamed ◽  
G. Chiang
Keyword(s):  
Measurement System ◽  
Blood Gas ◽  
Gas Measurement

Clinical evaluation of an instrument to measure carbon dioxide tension at the oxygenator gas outlet in cardiopulmonary bypass

Perfusion ◽  
2006 ◽  
Vol 21 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Frode Kristiansen ◽  
Jan Olav Høgetveit ◽  
Thore H Pedersen
Keyword(s):  
Carbon Dioxide ◽  
Cardiopulmonary Bypass ◽  
Venous Blood ◽  
Carbon Dioxide Tension ◽  
Circuit Board ◽  
Separate Analysis ◽  
Blood Gas ◽  
Arterial Blood ◽  
Gas Measurement ◽  
Venous Blood Gas

This paper presents the clinical testing of a new capno-graph designed to measure the carbon dioxide tension at the oxygenator exhaust outlet in cardiopulmonary bypass (CPB). During CPB, there is a need for reliable, accurate and instant estimates of the arterial blood CO2 tension (PaCO2) in the patient. Currently, the standard practice for measuring PaCO2 involves the manual collection of intermittent blood samples, followed by a separate analysis performed by a blood gas analyser. Probes for inline blood gas measurement exist, but they are expensive and, thus, unsuitable for routine use. A well-known method is to measure PexCO2, ie, the partial pressure of CO2 in the exhaust gas output from the oxygenator and use this as an indirect estimate for PaCO2. Based on a commercially available CO2 sensor circuit board, a laminar flow capnograph was developed. A standard sample line with integrated water trap was connected to the oxygenator exhaust port. Fifty patients were divided into six different groups with respect to oxygenator type and temperature range. Both arterial and venous blood gas samples were drawn from the CPB circuit at various temperatures. Alfa-stat corrected pCO2 values were obtained by running a linear regression for each group based on the arterial temperature and then correcting the PexCO2 accordingly. The accuracy of the six groups was found to be (±SD): ±4.3, ±4.8, ±5.7, ±1.0, ±3.7 and ±2.1%. These results suggest that oxygenator exhaust capnography is a simple, inexpensive and reliable method of estimating the PaCO2 in both adult and pediatric patients at all relevant temperatures.

Monitoring of heat-lung machine with continuous blood-gas measurement

2003 ◽  
Author(s):  
A. Lautier ◽  
T. Dehe ◽  
D. Gaillard ◽  
A.M. Juvin ◽  
J.C. Sargentini ◽  
...  
Keyword(s):  
Blood Gas ◽  
Gas Measurement ◽  
Lung Machine

Multizone, single tracer gas measurement system for ventilation research

1993 ◽  
Vol 64 (3) ◽  
pp. 806-809 ◽  
Author(s):  
Duncan A. Phillips ◽  
Gordon M. Bragg ◽  
Elizabeth J. Weckman
Keyword(s):  
Measurement System ◽  
Tracer Gas ◽  
Gas Measurement

scholarly journals Sampling Errors in pH and Blood Gas Analysis—An Evaluation of Three New Arterial Blood Samplers

1986 ◽  
Vol 23 (3) ◽  
pp. 329-333 ◽  
Author(s):  
A S Hutchison ◽  
F J Dryburgh ◽  
S H Ralston
Keyword(s):  
Blood Gas Analysis ◽  
Gas Analysis ◽  
Blood Gas ◽  
Sampling Errors ◽  
Venous Sampling ◽  
Arterial Blood Gas ◽  
Arterial Blood ◽  
Increased Risk ◽  
Gas Measurement ◽  
Heparin Solution

We have tested the accuracy, acceptability and general performance of three recently-marketed samplers for arterial blood gas measurement (the Corning Arterial Blood Sampler, the Concord ‘Pulsator’ and the Sarstedt ‘Monovette’™). All three greatly reduce or eliminate the error of venous sampling, and the Corning and Sarstedt samplers eliminate the risk of dilution of the sample by excess heparin solution. A positive bias in pO2 measurement, more marked at higher levels, was demonstrated with the Concord and Sarstedt samplers, and the latter carry a slightly increased risk of cross-infection. None of the samplers completely overcame potential sampling errors.

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