**ln NT-proXNP (pmol/l)**

Fig. 3. Relationship between logarithmic transformed NT-proXNP levels and Cardiac index

Conventionally measured parameters such as heart rate, mean arterial pressure and pulsepressure product exhibited weaker correlations with CI than natriuretic peptide levels. Parameters measured by echocardiography i.e. fractional shortening and calculated pressures of the right ventricle were not correlated to CI. Clinical and laboratory values, except for creatinine level and creatinine clearance, showed no correlation with CI or NTproXNP. According to our findings, natriuretic peptides and NT-proXNP are indicators of hemodynamic parameters following pediatric cardiac surgery that can only be measured by invasive hemodynamic monitoring.
