Comparing oxygen transfer performance between three membrane oxygenators: effect of temperature changes during...

Area of Science:

• Cardiopulmonary Bypass
• Medical Device Engineering
• Respiratory Physiology

Background:

• Oxygenators are critical components in cardiopulmonary bypass (CPB) procedures, facilitating gas exchange.
• Evaluating the performance of new oxygenator models is essential for optimizing patient outcomes.
• Existing oxygenator models vary in their efficiency and gas transfer capabilities.

Purpose of the Study:

• To evaluate the oxygen transfer performance of the new Dideco 903 (D903) oxygenator.
• To compare the D903 oxygenator's performance against two other commercially available models: Dideco 703 (D703) and Quadrox.
• To assess key performance metrics including oxygen transfer slope, oxygen gradients, shunt fraction, maximum oxygen transfer, and diffusing capacity.

Main Methods:

• A randomized study involving sixty patients undergoing CPB.
• Patients were allocated to three groups, each using a different oxygenator: D703, D903, or Quadrox.
• Performance was evaluated by measuring oxygen transfer slope, arterial oxygen gradients, shunt fraction (Qs/Qt), maximum oxygen transfer (VO(2)), and diffusing capacity (DmO(2)).

Main Results:

• The D903 oxygenator exhibited significantly higher maximum oxygen transfer (VO(2)) compared to D703 and Quadrox (P < 0.05).
• D903 and Quadrox showed more efficient oxygen (O(2)) gradients than D703 (P < 0.05).
• Diffusing capacity indexed to body surface area (DmO(2)/m(2)) was highest for D903, outperforming D703 (P < 0.0005). Shunt fraction and diffusing capacity were comparable between groups under normothermic conditions.
• During hypothermia, all oxygenators showed reduced VO(2), lower O(2) gradients, and increased Qs/Qt, with no significant differences between models.

Conclusions:

• The Dideco 903 oxygenator demonstrates superior oxygen transfer capabilities compared to the Dideco 703 and Quadrox models.
• Oxygenator performance varies significantly among different membrane types, quantifiable by oxygen transfer curves.
• Despite performance differences, all three oxygenators are deemed adequate for meeting patient oxygenation requirements during CPB.