الفهرس 
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Abstract
Speckle tracking echocardiography is an emerging echocardiographic technique that is increasingly used in the diagnosis and management of acquired heart disease in adults. In pediatric heart disease, this is still mainly considered as a research tool as the application of this technology has been slowed by the lack of vendor‐independent technology and of normative data across the different age ranges. We believe that the technology has potential applications for the early detection of myocardial dysfunction, the quantification of ventricular function in congenital heart disease, and the detection of dyssynchrony. Its advantage is the high frame rates associated with color tissue Doppler that can be advantageous in patients with high heart rates as are seen in pediatrics. More recently, two‐dimensional (2D) STE has been introduced as a more reproducible method for measuring strain parameters. Intracardiac shunts are a spectrum of disorders that could range in presentation from being asymptomatic to fatal. The two big categories of intracardiac shunts are cyanotic and a cyanotic. Cyanotic shunts impair oxygenation of blood by the pulmonary system and result in cyanosis. A cyanotic shunt does not impair blood flow to the lungs, and the process of oxygenation is intact. Following are different types of a cyanotic and cyanotic shunts. The aim of the present study was to assess the feasibility of speckle tracking echocardiography in estimation of left ventricular systolic function in congenital shunt lesions (ASD, VSD and PDA). This study was a case–control study which included 270 patients undergoing echocardiography in the Outpatient Clinic of Tanta University Hospital. The study was starting from 1st of October 2018 to 28th of November 2020. The main results of the study revealed that: As regards the patient’s gender, there was no significant difference between the studied groups. Regarding size of the shunts, there was statistically significant difference between our groups. Regarding the echocardiographic parameters of our studied groups, there was statistically significant difference between PDA group and control group regarding EDD, ESD, EF, EDV and ESV. There was statistically significant difference between ASD group and control group regarding EF, FS and ESV Regarding Mitral Annular Plane Systolic Excursion (MAPSE), there was statistically significant difference between ASD, PDA and control group. Regarding MPI and S wave, there was no statistically significant difference between the studied groups regarding MPI and S wave. Regarding Regional LV Longitudinal Strain Velocities of 2D Speckle tracking echocardiography, there was statistically significant difference between our studied groups. There was statistically significant difference between ASD and control group at apical septum segment. There was statistically significant difference between ASD and control group at mid antero lateral segment. There was statistically significant difference between ASD, VSD, PDA and control group at Basal antero Lateral segment. There was statistically significant difference between ASD and control group at Basal inferoseptal segment. There was no statistically significant difference between ASD, VSD, PDA and control group regarding to GLS.