Simple and reliable method for predicting extracorporeal membrane oxygenation flow rates and circuit pressures

Authors: Kazuhiro Takahashi, Seiga Takahashi, Yusuke Takei, Yu Kaiho, Takahiro Imaizumi, Kenji Kikuchi, Takuji Ishikawa, Yutaka Ejima & Masanori Yamauchi

This study presents a fluid dynamics–based predictive model for estimating venovenous ECMO flow rates and circuit pressures. Using a laboratory ECMO setup with varying cannula sizes, pump speeds, and bed heights, a four-step method was developed that integrates component pressure–flow relationships and pump performance curves to calculate expected flow and pressure at different circuit points. The model was tested across 36 experimental conditions, demonstrating strong agreement between predicted and measured values.

The results showed high model accuracy, with excellent correlation between calculated and observed flow rates and pressures, and confirmed that bed height significantly affects circuit pressures without altering flow. This method provides a simple and reliable tool for optimising cannula selection and circuit configuration, with the potential to improve patient safety and ECMO management. Additionally, it offers educational value by translating complex hemodynamic principles into an intuitive framework for clinical training.