Respiratory Dysfunction Flashcards
(299 cards)
What is the most critical and immediate physiologic change required of newborns?
onset of breathing
Chemical factors that stimulate breathing is
low O2
high CO2
low pH
Chemical and thermal factors in the blood initiate impulses exciting the
respiratory center in the medulla
Thermal stimulus for the onset of breathing in newborns is
sudden chilling of the infant (leaving the warm environment of the mother’s womb)
What are acceptable methods of tactile stimulation for stimulating breathing?
tapping or flicking the soles of the feet
gently rubbing the newborn’s back, trunk, or extremities
Should the nurse slap the newborn’s butt or back to stimulate breathing?
no, harmful technique and should not be used
What does prolonged tactile stimulation consist of?
2+ taps or flicks
Why should you not be able to use prolonged tactile stimulation on a newborn?
waste precious time in the event of respiratory difficulty
+ Become hypoxemic in the birth process
The initial entry of air into the lungs is opposed by
surface tension of the fluid-filled inside the lungs and alveoli
What happens to the remaining lung fluid instead of being pushed out during birth?
absorbed by the capillaries and lymphatic vessels
S/S of Respiratory Distress Syndrome
Tachypnea (80-120) initially (could be respiratory failure and shock due to prematurity)
Dyspnea
Retractions (intercostal and substernal)
Fine inspiratory crackles
Audible expiratory grunt
Flaring nares
Cyanosis or pallor
Respiratory Distress Syndrome of nonrespiratory origin is caused by
sepsis
cardiac defects
exposure to cold (Pneumonia - bacterial or viral)
airway obstruction (atresia)
intraventricular hemorrhage
hypoglycemia
metabolic acidosis
acute blood loss
drugs (rare in drug-exposed infants)
Respiratory Distress Syndrome carries the highest risk what type of complications
respiratory and neuro complications
- preterm infants
Patho of RDS
preterm infants born with premature lungs
- more cartilage in the chest wall (collapses inward to stiff tissues)
- Underdeveloped and under-inflatable alveoli
Blood flow is limited due to collapse and shunted from the lungs to ductus arteriosus and foramen ovale
Lack of surfactant and unable to adjust to lack of blood flow and inability to take in O2 and close the cardiac shunts
Surfactant
surface-active phospholipid secreted by alveolar epithelium
- reduces the surface tension of fluids that line the alveoli and respiratory passage
- uniform expansion and maintenance of lung expansion at low interalveolar pressure
Low surfactant production causes
unequal inflation of alveoli on inspiration and the collapse of alveoli on expiration
- Alveoli collapse
- not able to inflate lungs
- need to exert more effort to reexpand
This inability to maintain lung expansion produces
atelectasis
How does the O2 concentration normally increase after birth?
ductus arteriosus constricts and the pulmonary vessels dilate to decrease PVR
Atelectasis and the absence of alveolar stability relations to blood flow to the lungs
PVR increases with resistance to blood flow
increase of hypoperfusion to lung tissue
Increase of PVR = fetal shunts stay open = prevents blood flow oxygenation of the lungs
Inadequate pulmonary perfusion and ventilation produce
hypoxemia (pulmonary arterioles constriction)
hypercapnia
RDS is the deficiency of
surfactant
Dx of RDS
Chest Xray studies
Managing of RDS
immediate supplemental O2 and ventilation
IVF
TPN
Prevent hypotension
thermal environment
What type of feedings are contraindicated for an RSD pt?
nipple feedings
increases RR, aspirations