Swan Ganz catheter-Edwards Lifesciences obtains values of cardiac output/index and systemic vascular resistance/index using the mean artery pressure of either radial or femoral artery.

During weaning from extracorporeal circulation, arterial waveform-derived cardiac output measurements from radial cannulation site is not reliable as compared with measurements obtained from femoral cannulation site.

50 consecutive cardiac surgical patients undergoing on-pump primary coronary artery bypass, valve replacement or combined surgery are included in the study. Cardiac output is measured sequentially by the arterial pressure waveform analysis method from radial and femoral arterial sites

Inclusion Criteria: Coronary artery disease , aortic valve stenosis, aortic valve regurgitation, mitral valve stenosis, mitral valve regurgitation,

Exclusion Criteria: none