- Procoagulant and anticoagulant factor abnormalities following the Fontan procedure: increased factor VIII may predispose to thrombosis. Odegard, K.C., McGowan, F.X., Zurakowski, D., Dinardo, J.A., Castro, R.A., del Nido, P.J., Laussen, P.C. J. Thorac. Cardiovasc. Surg. (2003)