Coagulation monitoring in postcardiotomy ECMO: conventional tests, point-of-care, or both?

Area of Science:

• Cardiovascular Surgery
• Critical Care Medicine
• Hematology

Background:

• Managing anticoagulation during postcardiotomy extracorporeal membrane oxygenation (ECMO) is critical.
• Standard coagulation tests are essential but may not provide rapid results.
• Point-of-care (POC) tests offer potential for timely assessment.

Purpose of the Study:

• To assess the association between POC coagulation tests and standard coagulation tests during postcardiotomy ECMO.
• To determine the predictive value of POC tests for achieving target ranges in standard coagulation tests.
• To evaluate the utility of POC tests in guiding anticoagulation management.

Main Methods:

• Analysis of paired data from POC tests (ACT, R-time, MA) and standard coagulation tests in 31 postcardiotomy ECMO patients.
• Statistical analysis to determine associations and positive predictive values (PPV).
• Defined target ranges for activated partial thromboplastin time (aPTT), international normalized ratio (INR), platelet count, and fibrinogen.

Main Results:

• Activated clotting time (ACT) between 162-185 seconds predicted the desired aPTT range.
• Combinations of ACT and R-time showed significant PPV for short (83%) and long (71%) aPTT.
• Maximum amplitude (MA) <41 mm had a 75% PPV for low platelet count or fibrinogen.
• No predictive ability of POC tests for the optimal INR range was found.

Conclusions:

• Diagnostic-therapeutic algorithms using coagulation POC tests can aid anticoagulation management during postcardiotomy ECMO.
• Combined ACT and viscoelastic tests offer the best positive predictive value for therapeutic decisions.
• POC testing facilitates timely adjustments to anticoagulation therapy.