Circulatory failure in term newborn

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Hi

I ask for actual practice in managing circulatory failure in term and near term newborn. It's very intersting for us because there is not clear protocols like infants or children or aults.
The two situations where i need to have your opinion are:

1 - a term neonate with severe respiratory failure and neonatal infection. echocardiography shows PPHN.

2 - a term neonate without severe respiratory distress but with intractable septic shock.

thanks