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 B
Explanation
Choice A) Wrap the cord loosely with a sterile towel saturated with warm normal saline: This is not an appropriate action because it does not relieve the compression of the cord, which can cause fetal hypoxia and acidosis. The cord should be kept moist, but not wrapped around anything.
Choice B) Place a sterile gloved hand into the vagina and hold the presenting part off the cord while calling for assistance: This is the correct action because it prevents further descent of the fetus and reduces the pressure on the cord, which can improve fetal oxygenation and blood flow. The nurse should also elevate the woman's hips and place her in a knee-chest or Trendelenburg position to reduce gravity. The nurse should call for immediate assistance and prepare for an emergency cesarean section.
Choice C) Increase the IV drip rate: This is not an appropriate action because it does not address the cause of the variable decelerations, which is cord compression. Increasing the IV fluid may cause fluid overload and worsen maternal and fetal outcomes.
Choice D) Administer oxygen to the woman via mask at 8 to 10 L/minute: This is not an appropriate action because it does not relieve the cord compression, which is the main threat to fetal well-being. Oxygen administration may be helpful in some cases of fetal distress, but it is not sufficient in this situation.
Correct Answer is D
Explanation
Choice a) Check the baby's diaper is incorrect because this is not a priority action for a baby who is grunting in the neonatal nursery. Grunting is a sign of respiratory distress, which means that the baby is having difficulty breathing and is trying to keep air in the lungs by making a low-pitched sound with each expiration. Checking the baby's diaper may be part of routine care, but it does not address the underlying cause of the grunting or improve the baby's oxygenation. Therefore, this action should be done after assessing and treating the baby's respiratory status.
Choice b) Place a pacifier in the baby's mouth is incorrect because this is not an appropriate action for a baby who is grunting in the neonatal nursery. Grunting is a sign of respiratory distress, which means that the baby is having difficulty breathing and is trying to keep air in the lungs by making a low-pitched sound with each expiration. Placing a pacifier in the baby's mouth may interfere with the baby's breathing and worsen the grunting, as it can obstruct the airway, increase the work of breathing, or cause aspiration. Therefore, this action should be avoided or used with caution for babies who are grunting.
Choice c) Have the mother feed the baby is incorrect because this is not a safe action for a baby who is grunting in the neonatal nursery. Grunting is a sign of respiratory distress, which means that the baby is having difficulty breathing and is trying to keep air in the lungs by making a low-pitched sound with each expiration. Having the mother feed the baby may increase the risk of choking or aspiration, as the baby may not be able to coordinate sucking, swallowing, and breathing. Therefore, this action should be delayed or modified until the baby's respiratory status improves.
Choice d) Assess the respiratory rate is correct because this is the most important action for a baby who is grunting in the neonatal nursery. Grunting is a sign of respiratory distress, which means that the baby is having difficulty breathing and is trying to keep air in the lungs by making a low-pitched sound with each expiration. Assessing the respiratory rate can help to determine the severity and cause of the respiratory distress, as well as guide further interventions such as oxygen therapy, suctioning, or medication. The normal respiratory rate for a newborn ranges from 30 to 60 breaths per minute, and it may vary with sleep or activity. A respiratory rate above 60 breaths per minute or below 30 breaths per minute indicates abnormality and requires immediate attention. Therefore, this action should be done as soon as possible for babies who are grunting.
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