Coagulation studies during experimental hemoglobinemia in humans

Area of Science:

• Hematology
• Hemostasis and Thrombosis
• Experimental Medicine

Background:

• Autologous hemolyzed blood infusion is a long-standing experimental model in human studies.
• Previous research indicated this model is generally free of adverse clinical reactions.

Purpose of the Study:

• To investigate the potential for subclinical disseminated intravascular coagulation (DIC) following autologous hemolyzed blood infusion in healthy humans.
• To assess the safety and hemostatic impact of experimental hemoglobinemia.

Main Methods:

• Hemoglobinemia was induced in 10 subjects via single injection and in 4 via continuous infusion of autologous hemolyzed blood.
• Coagulation parameters including prothrombin time, partial thromboplastin time, thrombin time, fibrinogen, white blood cell count, and fibrin degradation products were measured.
• Platelet counts were monitored for transient changes.

Main Results:

• Induced hemoglobinemia was asymptomatic, with peak plasma levels up to 540 mg/100 ml.
• No significant alterations were observed in standard coagulation tests or fibrin degradation products.
• A slight, transient decrease in platelet count occurred post-infusion, resolving within 30 minutes, suggesting temporary sequestration.

Conclusions:

• Moderate, brief experimental hemoglobinemia induced by autologous hemolyzed blood infusion does not lead to demonstrable disseminated intravascular coagulation (DIC) in normal subjects.
• The findings support the continued use of this model in human research, reinforcing its safety profile regarding hemostasis.