Midterm to Final Material Flashcards
What are the 3 stages of the newborn adapting to extrauterine life?
What can be observed in the newborn during each stage?
How long does each stage last?
In which stage is it most likely from meconium to be expelled
- First period of reactivity: Alert & active best time for breast feeding, suck is strong. tachypneic and tachycardic, lasts 30mins-1 hour after birth.
- Period of decreased Responsiveness, 2-3 hours after birth (newborn falls asleep, HR & RR decrease)
- Second period of reactivity: (4-6 hours after birth, lasts 10mins to hours). ** most likely to pass meconium
By _____ wks there is enough surfactant in the newborns lungs that they can have a good chance of survival
32 weeks
Lack of ________ is what impacted pre-matures infants ability to breath properly
surfactant
Fetal respiratory movements have been detected on Ultrasound as early as ______ weeks
11
These movements are essential for developing chest wall muscles and diaphragm
By weeks ____ to _____ some fluid moves into the trachea and into the amniotic fluid or is swallowed by the fetus
13-16 weeks
By ___ to ___ weeks rhythmic breathing movements occurs
29-32 weeks
What are the 2 types of fetal surfactant?
lecithin
sphingomyelin
_______ surfactant will increase in amount
&
________ surfactant will remain constant in amount
lecithin
sphingomyelin
L:S ratio is used to determine how ________ the fetuses lung are
mature
once the L:S ratio is 2:1 (lecithin:sphingomyelin) we can say that the fetus lungs are mature
At what point is the L:S ratio 2:1?
35 weeks gestation
what factors can delay fetal lung maturity?
gestational diabetes
What chemical reactions occur to the fetal respiratory system during labour to ‘activate the lungs’
There are chemoreceptors in the carotid arteries and aorta that are activated by the hypoxia in birth that signal the lungs to begin working
hypoxia and increased CO2 levels during birth stimulate what to kick off the respiratory system
signal to the resp center in the medulla that breathing needs to begin
What mechanical factors activate fetal respiratory adaptations after brith
intrathoracic pressure»_space; going through the birth canal. once the baby is out of birth canal pressure is released. The negative pressure helps pull air into the lungs .
Crying increases distribution of air in lungs encouraging alveoli to open.
what thermal & sensory factors activate fetal respiratory adaptations after birth
Temperature drops when fetus is born» this stimulates receptors in the skin to further stimulate receptors in the medulla.
sensory stimulation: drying the infant, skin to skin, light, air etc all helps to stimulate the resp center.
how is the fluid removed from the lungs after birth?
pressure through the birth canal pushes it out, crying opens alveoli helping to push it out.
Any remaining fluid is absorbed back into the body through bloodstream and lymphatic stream
what factors negatively impact fetal respirations after birth?
alveoli are immature»_space; risk for inadequate oxygenation
small alveoli and low in #
decreased lung elasticity»_space; this will come in time.
nose breathers (risk of airway obstructions
immature resp control ability»_space; irregular breathing pattern and periods of apnea
not able to rapidly alter the depth of their resps yet.
What are normal findings for newborn resp assessment
shallow & irregular resps
30 - 60 breaths per min
Resp rate increases w/ activity
periodic apnea, pauses should be < 20 sec
what are signs of resp distress in newborn?
nasal flaring retractions grunting apnea lasting > 20 sec RR < 30 OR 60< central cyanosis (around the mouth) ** as opposed to acrocyanosis
What 3 shunts are present during fetal life?
ductus venosus
ductus arteriosus
Foramen ovale
in utero the ________ is a ____ resistance pathway for gas exchange
placenta
low-resistance (blood flows easily)
The ductus venosus connects the umbilical _____ to the _____ vena cava
vein
inferior vena cava
the ductus arteriosus connects the main ______ artery to the ______
pulmonary artery
aorta
the foramen ovale allows blood to pump the right ____ to the left ____
right atria to left atria
closes within the first few mins of life after the pressure changes in the circulatory system push oxygenated blood through the heart