Intraoperative transesophageal echocardiography using high-resolution biplane 7.5 MHz probes with continuous-wave Doppler capability in infants and children with tetralogy of Fallot

Our study indicates that (1) the biplane TEE probe provides an accurate assessment of the surgical repair of ToF in infants and children; (2) the longitudinal plane especially offers important information showing right ventricular outflow tract anatomy that cannot be fully defined using conventional transverse plane TEE; and (3) implementation of steerable CW Doppier aids quantification of residual right ventricular outflow tract obstruction, especially when implemented from transgastric views.