2. 3: Echocardiography:
Transthoracic echocardiographic study was performed for the neonates
using IE 33 platform scanner (Philips Medical ultrasound systems,
Washington, USA). Matrix-array transducer (S12) and (S8) were used for
the 2D, M Mode and Doppler study. The studies were performed without
sedation with babies asleep or suckling on bottle of milk.
Studies included recording of apical four chamber, three chamber and two
chamber 2D views for quantification of global longitudinal strain and
calculating ejection fraction. M-mode was used in parasternal short axis
views for calculating fractional shortening. Images were stored in
digital format for off-line analysis. The echocardiograms were
downloaded to Xcelera R3.3 Cardiology PACS system (Philips Medical
ultrasound systems, Washington, USA) and were analyzed and reported
offline.