RESUMEN
The study included 30 patients, they were divided into 2 groups. Group I included 20 patients with atrial septal defect [ASD] in different forms. The other 10 patients [in group II] did not have ASD but they had other cardiac lesions and enrolled in the study as a control group. When the transverse plane transducer was used for the examination of group I patients, it was able to detect and accurately and correctly localize all the atrial septal defects in this group with no false negative [-ve] results. On examining group II patients, the transverse plane was able to exclude the presence of an ASD in all cases with no false positive [+ve] results. When the longitudinal plane transducer was used in group I patients, all the 20 atrial septal defects were detected with no false -ve results. On examining group II patients, the longitudinal plane was also able to exclude the presence of ASD in this group with no false +ve results. This newly added plane [the vertical plane] did not have additional value in the diagnosis and accurate localization of ASD in adults