PMID: 11903142Mar 21, 2002Paper

Real time monitoring of oxygen saturation in extracorporeal circulation using an optical reflectance transducer

Artificial Organs
F U GameroI A Cestari

Abstract

A novel optical reflectance transducer for continuous and real time monitoring of oxygen saturation (So2) in extracorporeal tubings during cardiopulmonary bypass (CPB) is described. The optical transducer integrates 2 light-emitting diodes and a photodiode. The transducer is attached to the extracorporeal tubing by a transparent flow through a 3/8 x 3/8 inch connector/cuvette. Four transducers were built and evaluated in vitro in a mock extracorporeal system at a controlled So2. The correlation index (r2) between the So2 measured by the transducers and values determined by a commercial blood gas analyzer was 0.998 with an absolute difference < 0.5%. The performance of the transducer was also evaluated during 16 CPB surgeries in patients with an r2 of 0.873 and an absolute difference < 3.5%. The results obtained demonstrate the applicability of the optical reflectance transducer for monitoring So2 in the tubings of the CPB circuit.

References

Feb 1, 1992·Journal of Cardiothoracic and Vascular Anesthesia·A Baraka
Oct 1, 1987·IEEE Transactions on Bio-medical Engineering·J M Steinke, A P Shepherd
Apr 1, 1970·IEEE Transactions on Bio-medical Engineering·R J Zdrojkowski, N R Pisharoty
Apr 27, 2001·IEEE Transactions on Bio-medical Engineering·M R UshizimaI A Cestari

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