Will pda (patent ductus arteriosus) help with tof (tetralogy of fallot)?

Sometimes: In Tetralogy of Falot, blood flow to the lungs may be restricted. As there are various degrees of restriction, there may be a need for more blood flow to the lungs. This situation may be helped by maintaining an open PDA. However if the pulmonary valve restriction is not severe, then an open PDA is not necessary. The cardiologist can draw this out for you.