Arterial and venous Thrombelastograph variables differ during cardiac surgery

Area of Science:

• Cardiovascular Sciences
• Hematology
• Medical Diagnostics

Background:

• The Thrombelastograph (TEG) is a vital point-of-care tool for assessing blood coagulation.
• Previous studies have utilized both arterial and venous blood samples for TEG analysis without direct comparison.
• Understanding potential discrepancies between sample types is crucial for accurate interpretation.

Purpose of the Study:

• To prospectively investigate and quantify differences in TEG variables between simultaneously drawn arterial and venous blood samples.
• To determine if blood sampling site influences TEG-derived coagulation parameters.

Main Methods:

• A prospective cohort study involving 40 cardiac surgical patients.
• Collection of paired arterial and venous blood samples for TEG analysis.
• Statistical comparison of TEG parameters including reaction time, maximum amplitude, alpha angle, K value, and lysis.

Main Results:

• Significant differences were observed in reaction time, maximum amplitude, alpha angle, and K values between arterial and venous samples.
• Arterial samples consistently demonstrated faster and stronger clot formation compared to venous samples.
• No significant difference was found in the lysis parameter between the two sample types.

Conclusions:

• TEG values are significantly influenced by the blood sample source (arterial vs. venous).
• Arterial blood yields TEG results indicative of more robust and rapid clot formation.
• Consistency in blood collection site is imperative for reliable and reproducible TEG analysis in clinical settings.