| Issue |
J Extra Corpor Technol
Volume 22, 1990
Proceedings of AmSECT’s 28th International Conference
|
|
|---|---|---|
| Page(s) | 17 - 22 | |
| DOI | https://doi.org/10.1051/ject/199022S017 | |
| Published online | 23 August 2023 | |
Original Article
In Vitro Comparison of ECC Blood Flow Measurement Techniques
Department of Extracorporeal Circulation Technology, College of Health Related Professions, Medical University of South Carolina, Charleston, SC
* Address correspondence to: Thomas M. Akers ECT Department, CHRP, Medical University of South Carolina 171 Ashley Avenue, Charleston, South Carolina 29425
Four extracorporeal blood flow measurement devices were compared for accuracy: the digital display (Stockert-Shiley roller pump), the Sarns doppler flow probe, the Transonic ultrasonic flow probe and the Biomedicus electromagnetic flow probe. The effects of changing temperature and hematocrit at various flows were compared.
Eighty-four blood flow measurements were recorded for hematocrits from 17.5% to 35.0%, temperatures from 25 to 37°C and flows from 3.0 to 5.5 LPM. A summary of the results follows:
| ACTQ(r2) | HCT | TEMP | INTER | MEAN | STD. DEV | |
| %DIFF | %DIFF | |||||
| Biomedicus | .98 | .0001 | NS | .0053 | 1.0 | 2.3 |
| Sams | .96 | .0203 | NS | NS | 1.6 | 3.2 |
| Shiley RPM | .99 | NS | NS | NS | -2.3 | 1.5 |
| Transonic | .99 | .0001 | NS | NS | 4.3 | 1.4 |
| ACTQ(r2) = correlation with actual flow, HCT = hematocrit effect on difference (p value), TEMP = temperature effect on difference (p value), INTER = 2way ANOVA interaction, MEAN/STD DEV %DIFF = average and one standard deviation of the percent difference between actual and reported flow, NS = non-significant. | ||||||
All flow measurement systems correlated with actual flow(p<.001). The Biomedicus, Sarns and Transonic errors were affected by hematocrit, while none were affected by temperature. (p<.05)
Key words: Flowprobe / accuracy / ultrasonic / doppler / electromagnetic / roller pump / temperature / hematocrit
© 1990 AMSECT
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