Platelet function testing in cardiac surgery: A comparative study of electrical impedance aggregometry and...

Area of Science:

• Cardiovascular Medicine
• Clinical Pathology
• Biomedical Engineering

Background:

• Point-of-care platelet function tests are crucial for managing antiplatelet therapy in cardiac surgery patients.
• Existing devices like Thromboelastography (TEG®) and Multiple Electrode Aggregometry (MEA) are widely used.
• The new TEG® 6 system with a PlateletMapping cartridge requires performance evaluation.

Purpose of the Study:

• To compare the performance of the TEG® 6 PlateletMapping system with the Multiplate™ MEA.
• To evaluate the agreement between these two point-of-care platelet function tests in cardiac surgery patients.

Main Methods:

• A comparative study involving 50 cardiac surgery patients.
• Preoperative platelet function testing using TEG® 6 PlateletMapping and Multiplate™ MEA.
• Tests were conducted with arachidonic acid (aspirin effect) and ADP (ADP antagonist effect).
• Analysis included Pearson's correlation and Bland-Altman plots.

Main Results:

• Pearson's correlation showed no significant correlation between MEA AUC and TEG® MA or % inhibition for either reagent.
• Bland-Altman analysis suggested potential agreement between the two methods, considering their different measurement scales.
• Both arachidonic acid and ADP tests were performed to assess different drug effects.

Conclusions:

• While direct correlation was not found, Bland-Altman plots indicate potential agreement between TEG® 6 PlateletMapping and Multiplate™ MEA.
• These point-of-care tests may offer complementary information for assessing drug-related platelet inhibition in cardiac surgery.
• Further research is warranted to fully understand the clinical utility and agreement of these assays.