| Issue |
J Extra Corpor Technol
Volume 20, 1988
Proceedings of AmSECT’s 26th International Conference
|
|
|---|---|---|
| Page(s) | 14 - 18 | |
| DOI | https://doi.org/10.1051/ject/198820S014 | |
| Published online | 25 August 2023 | |
Original Article
A Technique to Improve the Estimation of Hemoglobin Percent Oxygen Saturation During Cardiopulmonary Bypass
1
PSICOR, Inc., San Diego, CA
2
Cardiovascular Devices, Inc., Irvine, CA
* Direct Communications to: Jeffrey B. Riley, PSICOR, Inc., 16818 Via del Campo Court, San Diego, CA 92127.
Algorithms that estimate hemoglobin percent O2 saturation (%Hb·O2) from pH, pO2, and temperature assume a normal patient hemoglobin P50 equal to about 27 mmHg. Ischemic cardiac and peripheral vascular disease patients do not have P50s near normal.
A new continuous pH and blood gas monitor allows the user to evaluate and employ the patient's pre-CPB P50 to estimate the subsequent %Hb·O2. The P50 %Hb·O2 algorithm estimate was calculated retrospectively for a normal patient blood gas data set and the % error between the estimate and a cooximeter measurement correlated well with the patient P50 (r = .976).
The patient P50 %Hb·O2 algorithm estimate was compared to simultaneous in line %Hb·O2 readings (r = .42), a cooximeter measurement (r = .673), and a blood gas analyzer %Hb·O2 (assumes normal P50) estimate (r = .589). To employ a pre-CPB patient P50 value to estimate %Hb·O2 should improve the predicting power of a %Hb·O2 estimating algorithm during CPB.
© 1988 AMSECT
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