Explain Pulmonary Atresia With Intact Ventricular Septum ?
The direct communications between RV and PA is absent. The PDA is major source of blood flow to lungs From Aorta. The systemic venous return lo RA must go to LA through ASDI PFO. The RV is usually hypoplastic. Systemic venous blood mixes with pulmonary venous return in LA and goes into LV to supply body and lungs. The volume overload is on LA and LV, which is proportional to PBE The infant is usually cyanotic, and S2 is single due to single semilunar valve to close. The hypoplasia of RV and LA and LV overload produces LVH in ECG.