Key result
Shifting the roller pump position below the reservoir significantly reduced suction forces within the tubing in an in vitro extracorporeal circulation setup.
Why the study?
Extracorporeal circulation damages blood components through mechanical and suction forces, which may be reduced by repositioning roller pumps below the reservoir, while repeated silicone tubing compression likely causes degradation affecting circuit performance.
Does repositioning the roller pump below the reservoir reduce suction forces in an in vitro extracorporeal circulation setup?
Does repositioning the roller pump below the reservoir reduce suction forces in an in vitro extracorporeal circulation setup?
Shifting the roller pump position below the reservoir in extracorporeal circulation setups reduces negative pressures, potentially minimizing blood damage during cardiac surgery.
Repositioning the pump may lower suction forces in extracorporeal circuits; leaves open durability of flow and clinical translation.
Extracorporeal circulation (ECC) is an integral part of cardiac surgery. Yet, the contact with artificial surfaces, mechanical stress, shear, and suction forces within the ECC pose a pronounced risk for damaging the corpuscular components of the blood. These suction forces may be reduced by a repositioning of the roller pumps employed below the reservoir. Furthermore, the repeated compression of the involved silicone tubing is likely to cause degradation. We present our observations regarding changes in the ECC performance following this degradation process. In vitro experiments were performed in a standard as well as a simplified ECC setup and included measurements of pressure, effective flow, and tubing restoring force over a time frame of 12 hours with two different pump positions utilizing transit time flow measurement. Suction forces within the tubing could be significantly reduced by shifting the pump position below the reservoir. Regardless of the setup, the tubing showed significant loss of restoring force as well as effective flow over time. A shift of the pump position within the ECC setup can be recommended to prevent blood damaging negative pressures. Further research is necessary to evaluate the exact cause of the reduction of restoring force overtime as well as its risks for the patients. Finally, our results underline the importance of transit time flow measurements to collect reliable flow data.
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Schröter et al. (2020) studied Extracorporeal circulation. Shifting pump position below the reservoir vs. Standard pump position was evaluated on Suction forces, pressure, effective flow, and tubing restoring force. Shifting the roller pump position below the reservoir significantly reduced suction forces within the tubing in an in vitro extracorporeal circulation setup.
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