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In vitro hydrodynamic evaluation of pulmonary expanded polytetrafluoroethylene valved conduits is limited by its inability to reflect the biological environment and use of a single flow condition.
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This commentary highlights that while in vitro hydrodynamic evaluation of ePTFE pulmonary valved conduits is systematically controlled, it lacks biological fidelity and diverse physiological flow conditions.
The publication on “ in vitro hydrodynamic evaluation of pulmonary expanded polytetrafluoroethylene valved conduits” 1 is hereby discussed. This study has strengths in its systematically controlled laboratory experiment design and the use of particle image velocimetry to quantitatively assess flow characteristics. However, a major limitation is that it is an in vitro study, which cannot accurately reflect the actual biological environment, such as vascular wall compliance, tissue response, thrombosis, or long-term structural changes in expanded polytetrafluoroethylene (ePTFE). Furthermore, using only a single flow condition (stroke volume 70 mL, 70 bpm, pressure 30/10 mmHg) may not cover the diverse physiological range, especially in paediatric patients or those with pulmonary hypertension, who have varying dynamic loadings. Statistically, most results
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Daungsupawong et al. (2026) reported a letter. pulmonary expanded polytetrafluoroethylene valved conduits was evaluated. In vitro hydrodynamic evaluation of pulmonary expanded polytetrafluoroethylene valved conduits is limited by its inability to reflect the biological environment and use of a single flow condition.
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