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Evaluation of five in-line hematocrit monitors
S Niles1, R Cronbaugh, J Engle
1University of Iowa Hospitals and Clinics, Department of Surgery, Iowa City 52242, USA.
The Journal of Extra-Corporeal Technology
|February 7, 1995
Summary
Continuous hematocrit monitoring during cardiopulmonary bypass is crucial. The Cobe device demonstrated superior accuracy compared to four other in-line monitors, showing minimal error over time and varying conditions.
Area of Science:
- Biomedical Engineering
- Medical Device Technology
- Cardiovascular Surgery
Background:
- Accurate hematocrit monitoring is vital for effective blood product administration during cardiopulmonary bypass.
- Existing in-line monitors for continuous hematocrit or hemoglobin require evaluation for clinical reliability.
Purpose of the Study:
- To assess the accuracy of five different cardiopulmonary bypass in-line monitors.
- To compare the performance of these devices under varying physiological conditions.
Main Methods:
- An in vitro circuit primed with human blood was used to evaluate five cardiopulmonary bypass in-line monitors.
- Hematocrit, blood flow rate, and temperature were randomized to assess device accuracy.
- Statistical analysis was performed to determine correlations between device error and measured parameters.
Main Results:
- Hematocrit significantly correlated with error across all tested devices (p < 0.01).
- The CDI, Gish, IBC, and MX2 devices showed significant increases in error over time (p < 0.05).
- The Cobe device exhibited significantly lower overall error compared to other devices (p < 0.001).
Conclusions:
- The Cobe device is the most accurate for continuous hematocrit monitoring during cardiopulmonary bypass.
- Device accuracy is influenced by hematocrit, temperature, and blood flow rate.
- Continuous monitoring with accurate devices can optimize blood product management in cardiac surgery.