Conventional Transthoracic Echocardiography:
A ultrasound system (iE33, Philips, The Netherlands, Eindhoven),
equipped with a broadband S8-3(8-3 MHz) Sector Array transducer was used
to obtain images. Postnatal first and second echo were performed when
baby is asleep or at rest. 2D, M-mode, PW doppler and TDI measurements
described above were applied in accordance with the guidelines of the
American Society of Echocardiography [12,13]. Left ventricular mass
(LVM) measurements were normalised to body surface area (BSA) as indexed
LVM index (LVMi) as using the equation
(0.8{1.04[([LVDD+IVSd+LVPWd]3-LVDD3)]}+0.6)/BSA.