A newborn is diagnosed to have hypoplastic left heart syndro…

A newborn is diagnosed to have hypoplastic left heart syndrome. The PDA is present but needs to stay dilated. What can be done to assure this?I.      Keeping SpO2 between 70% – 80%II.      Administration of IbuprofenIII.      Keep PaO2 between 75 to 85 mmHgIV.      Administering prostagladins