This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
The following is false about Atrial septal defect ? 
Select and explain. 
A. Ostium secundum most common, B. Right to Left Shunt, C. May be associated with TAPVC, D. CCF is very rare
B: Right to Left Shunt
Answer: B: Right to Left Shunt 
Explanation: Ans. is 'b' i.e., Right to left shunt o In ASD there is left to right shunt. Clinical manifestations of ASD o Patients with ASD are generally asymptomatic. o Mild effo intolerance and respiratory tract infection may occur. CHF is rare. Physical examination o Parasternal impulse Systolic thrill at 2"d left interspace. o Accentuation of S, due to loud tricuspid component. o Wide split and fixed S2. o Ejection systolic murmur at the second and third left interspaces. o Delayed diastolic murmur at the lower left sternal border. o ASD with mitral stenosis --> Lutembacher syndrome.