Value of Naito's criteria in the surgical repair of tetralogy of Fallot

Naito suggested criteria for the optimal reconstruction of the right ventricular outflow tract in total correction of tetralogy of Fallot based on the minimum acceptable diameter of the pulmonary artery. The value of these criteria was assessed in 78 operated patients by haemodynamic measurements at surgery and 6 months after operation. Using these criteria, a ratio of right ventricular/left ventricular systolic pressure less than 0.60 was obtained with the creation of pulmonary regurgitation which was usually moderate. Long-term assessment of these results is required.