Perinatal Adaption at Birth Flashcards
What are the main roles of the placenta?
Foetal homeostasis Gas exchange Nutrient-waste transport Acid base balance Hormone production IgG transport
How much of the cardiac output goes to the lungs in-utero?
7%
What are the three main shunts in a foetal heart?
Ductus arteriosus
Ductus Venosus
Foramen Ovale
In a developing foetus, the lungs have a ____ resistance while the placenta/systemic resistance is ____
High resistance in lungs
Low resistance systemically
What vein is responsible for keeping the ductus venosus open?
Umbilical vein
At what gestational age does the foetus begin developing alveoli
36 weeks
Where does brown fat accumulate?
Between scapula
Around internal organs
What adaptions does the foetus go through in preparation for birth in 3rd trimester?
Surfactant production
Accumulation of glycogen
and brown fat
Swallowing of amniotic fluid
What hormones increase during the onset of labour?
Catecholamines and cortisol
What is a large benefit of vaginal delivery?
Squeezes the lungs to encourage fluid movement into interstitial lung tissue
What increases as the cord stops pulsating?
CO2
What happens to the pressure when a baby cries?
Huge increase in intrathoracic pressure pushing fluid out of lungs and into interstitial tissue
What changes occur to the circulation post-delivery?
Pulmonary vascular resistance decreases Systemic resistance increases O2 tension rises Circulating prostaglandins decrease Duct constricts Foramen ovale closes
What % of foramen ovale do not close?
10%
What does the ductus arteriosus become normally?
Ligamentum arteriosus
