Hypothesis The results of HepQuant in patients with CHD will correlate with outcomes of cardiac surgery (namely morbidity as defined by complications such as ischemic hepatitis, survival, need for heart transplantation, improvement of liver function post revision), and thus can be used for prognosis in this condition, either alone or in conjunction with other clinical, physiological, and laboratory prognostic scores, thereby giving clinical guidance concerning the need for heart transplantation and simultaneous liver transplantation..