Week 2 (Newborn) Flashcards
Neonatal Period
Birth to day 28 of life
- changes include respirations, circulation, temperature regulation, digestion, waste, & weight
First period of reactivity
15-30 minutes after birth
- HR may be 160 - 180
- Period of decreased responsiveness from 60 - 100 minutes (newborn either asleep or has marked decrease in motor activity)
Second period of reactivity
2 - 8 hours after birth
- tachycardia
- tachypnea
- increased muscle tone
- improved color
- meconium is usually passed
- often gags or chokes on mucus that has accumulated in the mouth
Ductus arteriosus
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Connects the pulmonary artery to the aorta
- A blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta
- closes within first 24 hours of life
- takes 2-3 months to fully closed
- can reopen (PDA) causes a murmur
Foramen ovale
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Connects the two atria in the fetal heart
- “hole in the heart”
Ductus venosus
Connects the umbilical vein to the inferior vena cava
- bypasses the liver - allows blood to go to the heart & to the rest of the body quickly
Normal Fetal PaO2
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20 - 30 mmHg
Do veins or arteries carry oxygen to the baby?
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VEINS
How many arteries & veins are in fetal circulation?
2 arteries & 1 vein (AVA)
What is the most important physiologic change in a newborn?
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initiation of breathing!!!!
What induces mild hypercapnia, hypoxia, & acidosis [normal is 7.30 - 7.40] that stimulate respiratory center?
labor
Chemical stimuli
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acidosis after birth stimulates the respiratory center
- contractions are also a chemical stimuli
Mechanical stimuli
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pressure from labor pushes fetal lung fluid out
Thermal Stimuli
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from womb temperature to outside temperature
Sensory stimuli
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drying, suctioning, etc.
Surfactant
fluid produced to open alveoli
- increased production with progressed gestation “backpack” will pull from if needed
If the baby isn’t breathing what measure should be taken?
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positive pressure ventilation
Apnea
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20 seconds of not breathing
Lung Sounds
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Clear / wet from c-sections / inductions
- tachy > 60
- brady < 30
Normal Fetal HR
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120 - 160 bpm
Normal Fetal BP
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75 - 95 over 25 - 45
How long should you wait before clamping & cutting the cord?
30 seconds
- allow blood volume to flow
- risk for hyperbilirubin / jaundice
Normal Fetal WBCs & Platelets
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- WBCs: 9,000 - 13,000
- Platelets: 150,000 - 300,000
What are the surroundings in which the infant can maintain a stable temperature with minimal oxygen consumption & a low metabolic rate?
Neutral thermal environment