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Clinical evaluation of setting pump occlusion by the dynamic method: effect on flow
L B Mongero1, J R Beck, T W Orr
1Columbia-Presbyterian Medical Center, Milstein Hospital, New York, NY 10032, USA.
Perfusion
|October 21, 1998
Summary
A new dynamic method for setting roller pumps allows for nonocclusive settings, significantly reducing hemolysis risk without compromising pump flow accuracy. This improves patient safety during perfusion procedures.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
Background:
- Standard roller pump occlusion settings, while ensuring flow accuracy, can increase blood hemolysis.
- Nonocclusive pump settings may offer reduced blood trauma but raise concerns about flow accuracy.
Purpose of the Study:
- To compare the standard occlusion method with a novel dynamic method for roller pump settings.
- To evaluate the flow accuracy of a nonocclusive pump using the dynamic method.
Main Methods:
- A clinical study (n=19) compared standard occlusion (pressure drop timing) with a dynamic method using the Better Header (BH).
- Occlusion settings were measured in mmHg/s at two points along the raceway.
- Pump flow was recorded using both the pump's output display and a Transonic flow meter.
Main Results:
- The dynamic method achieved nonocclusive settings significantly lower (30x less) than the standard method.
- Regression analysis showed patient flow, corrected by the dynamic method, closely matched pump revolutions per minute (r2=0.964).
- The average error between indicated and corrected pump flow was -1%, demonstrating high accuracy.
Conclusions:
- The Better Header facilitates nonocclusive roller pump settings.
- This dynamic method achieves accurate pump flow without the need for high occlusion.
- Nonocclusive settings with the BH method offer a promising approach to reduce blood trauma during perfusion.