PDA

1. Ductus arteriosus develops from which arch -

• 6th arch

2.  Ductus arteriosus  closes by =

• anatomical closure - 2-3 hours
• physiological closure - 2-3 weeks

3.Ductus dependent circulation  -

• Ductus dependent pulmonary circulation - 

•  tricuspid atresia
• pulmonary atresia with  intact ventricular septum

• Ductus dependent systemic  circulation - 

• HLHS
• Coarctation of aorta .
• interrupted  aortic arch

• Mixed   - TGA

4.Hemodynamic classification of PDA  - 

• SILENT - detected by ECHO only
• SMALL -  Q p / Qs   < 1.5
• MODERATE  -Q p / Qs  =1.5 - 2-2
• LARGE - Q p / Qs > 2.2
• PDA  WITH   EMS