Agreement Between Viscoelastic Coagulation Monitor (VCM), TEG 5000, and Coagulation Tests in Critically Ill Patients:...

Area of Science:

• Critical Care Medicine
• Hematology
• Biomedical Engineering

Background:

• Viscoelastic coagulation monitoring is crucial for managing critically ill patients.
• Comparing the performance of Viscoelastic Coagulation Monitor (VCM) and TEG 5000 (TEG) is essential for clinical application.
• The influence of heparin on these devices requires further investigation.

Purpose of the Study:

• To evaluate the agreement between VCM and TEG parameters.
• To assess the relationship between VCM/TEG parameters and standard coagulation tests.
• To determine the impact of heparin (unfractionated and low molecular weight) on VCM and TEG.

Main Methods:

• Multicenter study involving 127 critically ill patients.
• Simultaneous analysis of Viscoelastic Coagulation Monitor (VCM), TEG 5000 (TEG), and laboratory samples.
• Agreement assessed using Bland and Altman plots; correlations analyzed with Spearman's and linear models.

Main Results:

• Heparin significantly affected VCM and TEG parameters, with differing impacts between unfractionated heparin (UFH) and low molecular weight heparin (LMWH).
• Significant discrepancies observed in clotting times and amplitudes between VCM and TEG under UFH and LMWH.
• VCM-MCF demonstrated a strong correlation with platelet count, superior to TEG-MA, particularly during UFH administration.

Conclusions:

• VCM and TEG exhibit distinct responses to heparin, necessitating careful interpretation in clinical practice.
• VCM-MCF provides a reliable assessment of platelet count, even in patients receiving UFH.
• Further research is warranted to fully elucidate the clinical utility of VCM compared to TEG.