Neonatal Flashcards
Blood flow to the right and left sides of the heart occur in
Parallel
Two main points of shunting
Foramen ovale and ductus arteriosus
Foramen ovale
Allows for right to left blood from atria to bypass lungs. Oxygenated blood enters ascending aorta then goes to brain and upper body
Ductus arteriosus
Allows lungs to be bypassed and oxygenated blood flows to descending aorta and then to the lower body
Fetal blood flow to the lungs is
Minimal 10-12%
Why is fetal blood flow to the lungs minimal
Due to high pulmonary vascular resistance
Blood flow to the lungs is to provide nourishment as opposed to
Oxygen
Seperation from placenta and ventilation to the lungs results in
Closure of shunts known as transitional circulation
What occurs during transitional circulation
Pulmonary pressure starts to drop and systemic pressure is more. Blood goes to lungs
Closure of foramen ovale
Can occur in 2-3 months but can take up to 6 months or more
Closure of ductus arteriosus
Occurs with 72 hours
High larynx increases
Work of breathing
Low compliance of newborn lungs increases
Work of breathing and created increased effort for ventilation which results in increased respiration rate
Inefficient gas exchange
Is due to immature alveolar structure and function and decreased number of alveoli
Respiratory distress syndrome
Biggest predictor of prolonged patency