Pathology All India exam 8239c3a3 True About ostium premium ASD A Results in right axis detion(RAD) on the ECG B Is seen in Holt-Oram syndrome C Less common form than secundum ASD D May be left to close spontaneously High-Yield Explanation Ostium secondum defects are the most common type of ASD, and they are seen in Holt-Oram syndrome.