<prompt> The following is false about Atrial septal defectOstium secundum most commonRight to Left ShuntMay be associated with TAPVCCCF is very rare  <response>: In ASD there is left to right shunt.Clinical manifestations of ASDPatients with ASD are generally asymptomatic.Mild effort intolerance and respiratory tract infection may occur.CHF is rare.Physical examinationParasternal impulseSystolic thrill at 2nd left interspace.Accentuation of S1 due to loud tricuspid component.Wide split and fixed S2Ejection systolic murmur at the second and third left interspaces.Delayed diastolic murmur at the lower left sternal border.ASD with mitral stenosis Lutembacher syndrome. 