Decreased surfactant production in the preterm lung is a problem because surfactant
dilates the bronchioles, decreasing airway resistance.
provides transportation for oxygen to enter the blood supply.
keeps the alveoli open during expiration.
causes increased permeability of the alveoli.
The Correct Answer is C
Choice A) dilates the bronchioles, decreasing airway resistance: This is not the correct function of surfactant.
Surfactant is a substance that reduces the surface tension of the fluid that lines the alveoli, which are the tiny air sacs in the lungs where gas exchange occurs. Surfactant does not affect the diameter of the bronchioles, which are the small airways that branch from the bronchi. Bronchodilation and bronchoconstriction are regulated by the autonomic nervous system and various mediators, such as histamine, epinephrine, and acetylcholine.
Choice B) provides transportation for oxygen to enter the blood supply: This is not the correct function of surfactant. Surfactant does not transport oxygen or any other gas. Oxygen diffuses from the alveoli into the capillaries, where it binds to hemoglobin in the red blood cells. The red blood cells then transport oxygen to the tissues via the blood circulation. Surfactant does not play a role in this process.
Choice C) keeps the alveoli open during expiration: This is the correct function of surfactant. Surfactant prevents the alveoli from collapsing during expiration by lowering the surface tension of the fluid that lines them. This allows for easier breathing and better gas exchange. Without enough surfactant, the alveoli tend to collapse and stick together, causing atelectasis, which is a condition where some or all of a lung collapses. Atelectasis can lead to hypoxia, respiratory distress, and infection.
Choice D) causes increased permeability of the alveoli: This is not the correct function of surfactant. Surfactant does not increase or decrease the permeability of the alveoli, which is the ability of substances to pass through them.
Permeability of the alveoli depends on several factors, such as pressure gradients, solubility, molecular size, and membrane thickness. Increased permeability of the alveoli can occur in conditions such as acute respiratory distress syndrome (ARDS), where fluid leaks into the alveolar space and impairs gas exchange. Surfactant does not cause this condition, but it can be affected by it.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A) Spending extra time holding and rocking the infant is correct because this is an effective and recommended nursing care for an infant with neonatal abstinence syndrome. Neonatal abstinence syndrome (NAS) is a condition that occurs when an infant is exposed to drugs such as opioids, cocaine, or alcohol in utero and goes through withdrawal after birth. NAS can cause various physical and behavioral problems in the infant, such as irritability, poor feeding, vomiting, diarrhea, sweating, fever, or seizures. Holding and rocking the infant can provide comfort, warmth, and security to the infant, as well as reduce stress and pain. It can also promote bonding and attachment between the infant and the caregiver. Therefore, this nursing care should be included in the care plan for an infant with NAS.
Choice B) Feeding the infant on a 2-hour schedule is incorrect because this is not a helpful or appropriate nursing care for an infant with neonatal abstinence syndrome. Feeding is an important aspect of caring for any infant, as it provides nutrients and calories that support growth and development. However, feeding an infant with NAS on a 2- hour schedule may not be suitable or feasible, as NAS can affect the infant's feeding ability and tolerance. An infant with NAS may have difficulty sucking, swallowing, or coordinating breathing during feeding. They may also have frequent vomiting, diarrhea, or dehydration that can interfere with feeding. Therefore, feeding an infant with NAS should be done according to their cues and needs, rather than a fixed schedule. The infant should be offered small, frequent feedings of breast milk or formula, depending on the mother's preference and availability. The infant should also be burped often and held upright after feeding to prevent aspiration or reflux.
Choice C) Positioning the infant's crib in a quiet corner of the nursery is incorrect because this is not a sufficient or optimal nursing care for an infant with neonatal abstinence syndrome. Positioning is an important aspect of caring for any infant, as it affects their comfort, safety, and development. However, positioning an infant with NAS in a quiet corner of the nursery may not be enough or beneficial, as NAS can make the infant more sensitive and responsive to environmental stimuli. An infant with NAS may be easily disturbed or overstimulated by noise, light, or movement in the nursery. They may also feel isolated or neglected if they are placed away from other infants or caregivers.
Therefore, positioning an infant with NAS should be done in a way that minimizes stimulation and maximizes interaction. The crib should be placed in a dimly lit, low noise area of the nursery, but close enough to allow frequent monitoring and contact by the nurse. The crib should also be padded with soft blankets or pillows to prevent injury from excessive movements or seizures.
Choice D) Placing stuffed animals and mobiles in the crib to provide visual stimulation is incorrect because this is not a safe or suitable nursing care for an infant with neonatal abstinence syndrome. Stimulation is an important aspect of caring for any infant, as it enhances their learning and development. However, stimulating an infant with NAS with stuffed animals and mobiles may not be appropriate or advisable, as NAS can make the infant more irritable and restless. An infant with NAS may not enjoy or tolerate visual stimulation from toys or objects in their crib. They may also become agitated or overexcited by them, which can worsen their symptoms or cause complications. Moreover, placing stuffed animals and mobiles in the crib can pose a risk of suffocation, strangulation, or injury for the infant. Therefore, stimulating an infant with NAS should be done in a way that is gentle and gradual. The nurse should use soothing techniques such as talking softly, singing lullabies, or massaging the infant's skin to calm them down. The nurse should also use simple toys such as rattles or balls to engage them in play when they are alert and interested.
Correct Answer is B
Explanation
Choice A) Increased urinary output: This is not a sign of sepsis in newborns. In fact, sepsis can cause reduced urinary output due to poor blood flow to the kidneys and dehydration.
Choice B) Hypothermia: This is a sign of sepsis in newborns. Sepsis can cause changes in temperature, often fever, but sometimes low temperature. Hypothermia can indicate a severe infection that affects the body's ability to regulate its temperature.
Choice C) Wakefulness: This is not a sign of sepsis in newborns. Sepsis can cause reduced activity and lethargy due to inflammation and organ dysfunction.
Choice D) Interest in feeding: This is not a sign of sepsis in newborns. Sepsis can cause reduced sucking and difficulty feeding due to poor appetite, nausea, vomiting, and abdominal distension.
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