Evaluation of fibrin and platelet deposition on a human umbilical endothelial cell surface in perfusion chamber experiments using human whole blood.

Open-label, non interventional study Perfusion chamber experiment will be performed in 30 healthy patients. The Impact of different pH-solutions on thrombus lysis will be evaluated in an in-vitro second step

Outcome:

D-Dimer content of the thrombus reflecting the size of the thrombus.

All Subjects will have two perfusion chamber experiment as follow with an estimated maximum of blood loss of 165ml:

Before blood perfusion, perfuse the system including the chambers with human umbilical vein endothelial cell coated glass slides (HUVEC), with sodium chloride (NaCl) (0.9%), to ensure no leaks and to remove all air bubbles.

Blood is drawn from a vein in the arm with a Surflo® Winged Infusion Set, 19G (Terumo Europe, Leuven, Belgium) with a pump (Masterflex® L/S™, Cole-Parmer Instrument Company, Vernon Hills, Illinois, USA). Five mL of blood is discarded before each perfusion.

Three in serial placed flow chambers (with HUVEC) heated to 37°C are used. They are made of a Plexiglas block through which a cylindrical hole of 0.2 cm in diameter is machined. The aorta pieces are perfused at 10 mL/min for 5 minutes, followed by a 30 seconds perfusion with NaCl (0.9%).

The plasmin degraded thrombus D-Dimer content will be further evaluated under different conditions (different pH solutions).

Inclusion Criteria:

• Age > 18 years
• Written informed consent

Exclusion Criteria:

• Use of any medication
• Current diseases
• Anemia

30 healthy subjects