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11 Cards in this Set

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At what time in development does the fetus start making/storing surgactant?
Alveolar ducts begin to synthesis & store surfactant @ 24-28 wks
During fetal development, when is the L-S ratio equal?
At 28-32 wks
L-S is lecithin-sphingomyelin
What is given to a mom to accelerate the maturation of fetal lungs?
Betamethasone (given to Mom)
What happens if baby is born without mature lungs? (Mom not given Betamethasone)
Baby will get synthetic surfactant.
A doctor gets the L-S ratio of twins. Baby A's ratio is >2:1 and baby B is <2:1. What should you think?
Baby A (L-S is > 2:1) is stable.
Baby B (L-S <2:1) is unstable & can't support respiration.
True or false: Fetus has been practicing breathing movement in utero & indicates intact CNS.
True
What 4 things must happen to initiate respiration?
Chemical Changes
Temperature Changes
Sensory/Physical stimuli
Mechanical stimuli
Discuss the chemical changes that occur during labor to help initiate respiration. (pO2, pCO2, pH)
Transitory asphyxia of fetus occurs during L&D
pO2 ↓s from 80 to 15 mm Hg
pCO2 ↑s from 40 to 70 mm Hg
pH falls below 7.35
Changes in pO2, pCO2 & pH stimulates chemoreceptors in aortic & carotid bodies to trigger what event?
They trigger respiratory center in medulla to initiate breathing.
What causes the initial period of asphyxia that triggers a gasp?
The cord clamping
Describe the thermal changes the newborn experences to initate respiration.
The newborn changes from a tummy environment of 98.6°F to OR room temp of 70-78°F (@ best…).
Nerve endings in skin are stimulated to transmit impulses to medulla & baby takes a gasp.