Cardiopulmonary bypass. Microembolization and platelet aggregation

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Hematology

Background:

• Cardiac operations often require cardiopulmonary bypass using oxygenators.
• Both bubble and membrane oxygenators are used, with potential differences in their impact on blood components.

Purpose of the Study:

• To compare the effects of bubble versus membrane oxygenators on particulate microemboli and platelet aggregation during cardiac operations.

Main Methods:

• Blood samples from patients undergoing cardiac operations were analyzed using an electronic particle size analyzer.
• Microemboli and in vitro platelet aggregation were measured before, during, and after cardiopulmonary bypass with both bubble and membrane oxygenators.

Main Results:

• Membrane oxygenators generated fewer microemboli than bubble oxygenators.
• Both oxygenator types increased cardiotomy return microemboli, but membrane oxygenation resulted in less platelet aggregation post-bypass.
• Platelet loss exceeded hemodilution effects with both oxygenator types.

Conclusions:

• Membrane oxygenation offers advantages over bubble oxygenation by reducing particulate microembolization.
• Membrane oxygenation better preserves platelet function during cardiac operations, suggesting improved safety and efficacy.