The rapid technical improvement of the extracorporeal circulation in the past decades has led to safer, more comfortable and more compatible operations in cardiac surgery and interventions which used to be an adventure are now routine practice. Although most technical variables can easily be accommo dated today, the physical influence of artificial circulation systems on blood and tissue still remains uncertain in many cases. One of our main observations in the use of the extracorporeal circulation is that the prolonged interaction with unphysiological surfaces and forces of ten releases a...