Proceedings

In Line Oxygen Saturation Monitor

Emory University Clinic and Hospitals, Atlanta, Georgia

^* Address all communications to: Jeffrey B. Riley, Emory University Hospital, Perfusion Services, 1364 Clifton Road, NE, Atlanta, GA 30324.

Abstract

The first year, 800 cardiopulmonary bypass (CPB) (infant to adult) case experience with the Bentley Laboratories Oxy-Sat Meter (O-SM) demonstrated numerous patient management advantages to monitoring the percent saturation of hemoglobin (O₂ SAT). The O-SM exhibited accuracy equal to present 0 2 SAT monitoring. Patient management advantages fall into two categories: (1) Respiratory, from measuring the adequacy of arterial O₂ SAT to documenting oxygen transfer, and (2) Metabolic, judging the adequacy of extracorporeal circuit (ECC) blood flow.

The O-SM was found to have acceptable agreement with Instrumentation Laboratories 282, American Optical Unistat and Oximetrix catheter oximeters or the Severinghaus formula and Coming blood gas machine analog O₂ SAT estimators. Forty-three intermittant O-SM readings were compared to Lexington Instrument Corporation Lex-O₂-Con hemoglobin content and capacity measurements. The agreement standard deviation is equal to 1.4% 0 2 SAT for pH from 7.27 to 7.47, Base Excess from -8. to 4. mEq/L, temperature from 26 to 36 oC and hematocrit from 18 to 33%. Monitoring O₂ SAT during CPB is useful and reliable with the Oxy-Sat Meter.