Platelet behavior in extracorporeal circulation (ECC)

Area of Science:

• Biomaterials Science
• Hematology
• Medical Device Engineering

Background:

• Assessing blood compatibility with nonphysiologic materials is increasingly vital.
• Traditional methods focused on hemolysis, but current research emphasizes clotting capacity.
• Clotting capacity is evaluated by thrombocyte count, function, and bleeding time.

Purpose of the Study:

• To compare the hemocompatibility of standard open heart surgery equipment with alternatives.
• To determine more relevant parameters for ranking blood-contacting materials.
• To establish a reliable method for assessing hemocompatibility.

Main Methods:

• Comparison of commonly used standard open heart surgery equipment components against alternatives.
• Evaluation of blood compatibility parameters, including thrombocyte behavior (aggregation, desaggregation).
• Analysis of hematological differences between membrane-oxygenators and bubble-oxygenators.

Main Results:

• Thrombocyte behavior exhibited a distinct pattern: acute aggregation, a plateau, and a secondary dip.
• The percentage of circulating thrombocytes at the secondary dip correlated with major hematological differences.
• Material hemocompatibility ranking based on thrombocyte behavior proved more informative than hemolysis estimation alone.

Conclusions:

• The secondary dip in circulating thrombocytes provides the most comprehensive information on hemocompatibility.
• This method offers a more relevant assessment of blood-contacting materials than traditional hemolysis tests.
• Understanding thrombocyte dynamics is key to selecting appropriate medical devices for procedures like open heart surgery.