These are some resources for the Recognition and Management Of Ductal Dependent Obstructive Shock.
(1) Congenital Heart Disease Requiring Maintenance of Ductus Arteriosus in Critically Ill Newborns Admitted at a Tertiary Neonatal Intensive Care Unit [PubMed Abstract] [Full Text] [Full Text PDF]. J Crit Care Med (Targu Mures). 2016 Nov 8;2(4):185-191. doi: 10.1515/jccm-2016-0031. eCollection 2016 Oct
(3) Neonatal Point Of Care Ultrasound (POCUS) from the blog All Things Neonatal by neonatologist Dr. Michael R. Narvey. Dr. Narvey also has an outsanding YouTube Channel Michael R. Narvey which you will probably want to subscribe to.
(4) Current Neonatal Applications of Point-of-Care Ultrasound [PDF]