Comparative cardiac output measurements in elective cardiac bypass surgery.

The study is designed to elucidate the differences in cardiac output measurements between three different techniques in elective cardiac bypass surgery.

To study the minimal difference between the non-invasive and invasive different techniques.
Correlation between short and long catheters for cardiac output measurement.

To = Basis CO post-induction, pre-incision, horizontal tafelposition;

T1 = 3 min after opening of the sternum;

T2 = After heparine before ECC;

T3 = 10 min after protamine post-ECC;

T4 = After closure of the sternum;

T5 = End intervention, after skin closure, pre-transport.

Repeated simultaneous cardiac output measurements with three techniques (Ecom, Nexfin and Swan-Ganz) using short and long arterial radial catheters.