<prompt> In a Downs syndrome patient posted for surgery, the necessary preoperative investigation to be done is -CT BrainEchocardiographyUltrasound AbdomenX-ray cervical spine  <response>: Description:Congenital hea disease affects 40. In paicular, defects affecting the endocardial cushion are common: atrioventricular septal defect AVSD: considered the commonest cardiac defect associated with Down syndrome ostium primum atrial septal defect ASD ventricular septal defect VSD 