LecturePatient will present as → a premature infant who is born at 32 weeks and, after several hours, develops rapid shallow respirations at 60/ min, grunting retractions, and duskiness of the skin. The chest X-ray reveals diffuse bilateral atelectasis, ground glass appearance, and air bronchograms.
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Hyaline membrane disease (also known as newborn respiratory distress syndrome or RDS) affects premature infants. It occurs when infants are born before the lungs are producing adequate amounts of surfactant
- Surfactant helps to prevent the lungs from collapsing. As the airways collapse, infants will struggle more and more to breathe until they become acidotic, and multisystem organ failure begins
- Hyaline membrane disease is the most common cause of respiratory disease in the preterm infant
- Risk rises the earlier the birth - most cases occur before 30 weeks (highest risk before 28 weeks); uncommon after 34 weeks
- Other risk factors: maternal diabetes (delays surfactant production), male sex, cesarean delivery without labor, and perinatal asphyxia
- Presents within minutes to hours of birth: tachypnea, expiratory grunting, nasal flaring, retractions, and cyanosis that worsen over the first day or two
Acute respiratory distress syndrome (ARDS) vs. Hyaline membrane disease/newborn respiratory distress syndrome (RDS)
- Hyaline membrane disease/respiratory distress syndrome in preterm infants (RDS) is often due to young gestational age, immature type II alveolar cells, and lack of alveolar surfactant, resulting in inadequate alveolar surface tension during expansion, which results in atelectasis, reduced gas exchange, severe hypoxia, and acidosis.
- Hyaline membrane disease and RDS are two names for the same thing!
- Acute respiratory distress syndrome (ARDS) in newborns and children is distinct from RDS/Hyaline membrane disease and involves diagnostic criteria (Montreux definition). Unlike RDS, ARDS of newborns and children is not based on a lack of alveolar surfactant
- These diagnostic criteria for ARDS of newborns and children include:
- Acute onset (within 1 week) of a known or suspected clinical insult
- Not explained by RDS, transient tachypnea of the newborn (TTN), or congenital anomalies; diffuse bilateral opacities not fully explained by atelectasis or effusion
- Edema not explained by congenital heart disease
- Oxygenation index (OI) ≥4 (mild 4 to less than 8, moderate 8 to less than 16, severe 16 or more)
Diagnosis is clinical (preterm infant with worsening respiratory distress shortly after birth) plus the chest x-ray
- CXR: low lung volumes, diffuse "ground glass" (fine reticulogranular) appearance, and air bronchograms from diffuse bilateral atelectasis
- Early-onset sepsis/group B strep pneumonia can look identical - get a blood culture and usually start empiric antibiotics until it is ruled out
- Compare transient tachypnea of the newborn: term or late-preterm infant (often cesarean delivery), fluid in the fissures, resolves in 24 to 72 hours
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Chest radiograph one day after birth of a boy after 29 weeks and 3 days of gestational age who developed respiratory distress.
Prevention: give the mother antenatal corticosteroids when preterm delivery is expected within 7 days from 24 0/7 to 33 6/7 weeks of gestation - betamethasone 12 mg IM x 2 doses, 24 hours apart (a late-preterm course at 34 to 36 6/7 weeks may be offered if she has not already had one)
Treatment of the infant
- Early nasal CPAP is first-line support for spontaneously breathing preterm infants (target SpO2 90-95%)
- Surfactant through an endotracheal tube or a thin catheter (less invasive surfactant administration) if the infant is intubated or needs more than about 30% oxygen on CPAP - best given early
- Mechanical ventilation with positive pressure if CPAP fails
- Supportive care: warmth, careful fluids, early nutrition, and caffeine for apnea of prematurity; inhaled nitric oxide is not routine (reserved for persistent pulmonary hypertension)
Complications
- Main chronic complication: bronchopulmonary dysplasia (still needs oxygen at 36 weeks postmenstrual age)
- Others: pneumothorax and air leak, intraventricular hemorrhage, and retinopathy of prematurity from oxygen exposure
Babies may suffer permanent respiratory illness because of hyaline membrane disease, but others make a full recovery and suffer no consequences. The best treatment is to maintain a healthy pregnancy to prevent premature birth.
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Question 1 |
An infant born at 28 weeks' gestation develops grunting, nasal flaring, and intercostal retractions within minutes of birth. Which of the following is the underlying cause of this condition?
Deficiency of surfactant from immature type II pneumocytes | |
Delayed clearance of fetal lung fluid Hint: Delayed fluid clearance causes transient tachypnea of the newborn, usually in term or late-preterm infants after cesarean delivery. | |
Failure of pulmonary vascular resistance to fall after birth Hint: Failure of pulmonary vascular resistance to fall is persistent pulmonary hypertension of the newborn, usually in term infants. | |
Group B streptococcal infection of the lungs Hint: Early-onset group B strep pneumonia can mimic RDS but is suggested by maternal fever, prolonged rupture of membranes, or colonization. | |
Meconium-induced chemical pneumonitis Hint: Meconium aspiration occurs in term or post-term infants born through meconium-stained fluid. |
Question 1 Explanation:
Neonatal respiratory distress syndrome (hyaline membrane disease) is caused by surfactant deficiency in an immature lung. Type II pneumocytes do not yet make enough surfactant, so alveolar surface tension stays high, alveoli collapse (diffuse atelectasis), compliance falls, and the infant becomes hypoxemic within minutes to hours of birth. Risk rises the earlier the birth: it is very common before 28 weeks and uncommon after 34 weeks. Maternal diabetes delays surfactant maturation and also raises the risk.
Question 2 |
An infant born at 30 weeks' gestation begins to have respiratory difficulty shortly after birth. Examination reveals rapid, shallow respirations at 80/min with intercostal retractions, nasal flaring, grunting, and progressive cyanosis. Chest x-ray shows low lung volumes, a diffuse ground-glass (reticulogranular) pattern, and air bronchograms. Which of the following is the most likely diagnosis?
Meconium aspiration syndrome Hint: Meconium aspiration occurs in term or post-term infants and shows patchy infiltrates with hyperinflation. | |
Persistent pulmonary hypertension of the newborn Hint: PPHN causes severe hypoxemia, often with clear or minimally abnormal lungs on x-ray, usually in term infants. | |
Respiratory distress syndrome | |
Spontaneous pneumothorax Hint: A pneumothorax shows a visible pleural line with absent lung markings, often on one side. | |
Transient tachypnea of the newborn Hint: TTN occurs mainly in term or late-preterm infants and shows hyperinflation with fluid in the fissures. |
Question 2 Explanation:
A preterm infant with respiratory distress beginning shortly after birth and a chest x-ray showing low lung volumes, diffuse ground-glass (reticulogranular) opacities, and air bronchograms has neonatal respiratory distress syndrome (hyaline membrane disease). It is the most common cause of respiratory distress in preterm infants. Compare transient tachypnea of the newborn (term, hyperinflation, fluid in the fissures, resolves in 24 to 72 hours) and meconium aspiration (term or post-term, patchy infiltrates).
Question 3 |
A 31-week preterm infant breathing spontaneously develops tachypnea, grunting, and subcostal retractions 30 minutes after birth. SpO2 is 86% on blow-by oxygen. Chest x-ray shows low lung volumes and a diffuse reticulogranular pattern with air bronchograms. Which of the following is the most appropriate initial respiratory support?
Endotracheal intubation and mechanical ventilation Hint: Intubation is reserved for infants with apnea, poor respiratory effort, or failure of noninvasive support; early CPAP lowers the risk of bronchopulmonary dysplasia. | |
Extracorporeal membrane oxygenation Hint: ECMO is a last-resort rescue therapy and is not used for routine RDS in a preterm infant. | |
Inhaled nitric oxide Hint: Inhaled nitric oxide is used for persistent pulmonary hypertension of the newborn, not routine preterm RDS. | |
Nasal continuous positive airway pressure (CPAP) | |
Oxygen by hood without positive pressure Hint: Oxygen alone does not keep the collapsing alveoli open; positive pressure is needed. |
Question 3 Explanation:
For a spontaneously breathing preterm infant with RDS, early nasal CPAP is the preferred first-line support. Positive pressure keeps alveoli open, improves oxygenation, and avoids the lung injury of mechanical ventilation. Give surfactant (through an endotracheal tube or a thin catheter while on CPAP) if the infant needs more than about 30% oxygen on CPAP or must be intubated. Infants who are apneic or have poor effort need resuscitation and intubation.
Question 4 |
A 29-year-old woman at 31 weeks' gestation presents in preterm labor, and delivery within the next few days is likely. Which of the following medications given to the mother most reduces her newborn's risk of respiratory distress syndrome?
Betamethasone | |
Indomethacin Hint: Indomethacin is a tocolytic that may briefly delay delivery; it does not mature the fetal lungs. | |
Magnesium sulfate Hint: Magnesium sulfate is given before 32 weeks for fetal neuroprotection (lower risk of cerebral palsy), not to prevent RDS. | |
Nifedipine Hint: Nifedipine is a tocolytic used to delay delivery long enough to give steroids; it does not mature the lungs itself. | |
Penicillin G Hint: Penicillin G is given for group B streptococcus prophylaxis, not for lung maturity. |
Question 4 Explanation:
Antenatal corticosteroids are the most effective way to prevent neonatal RDS. Give the mother betamethasone 12 mg IM, 2 doses 24 hours apart, when preterm delivery is expected within 7 days between 24 0/7 and 33 6/7 weeks. Steroids cross the placenta and speed surfactant production, lowering the risk of RDS, intraventricular hemorrhage, and neonatal death. A late-preterm course (34 0/7 to 36 6/7 weeks) may be given to selected women who have not already had a course.
Question 5 |
An infant born at 26 weeks' gestation was treated for respiratory distress syndrome with surfactant and mechanical ventilation. At 36 weeks' postmenstrual age she still needs supplemental oxygen, and chest x-ray shows coarse interstitial opacities with areas of hyperinflation. Which of the following is the most likely diagnosis?
Bronchopulmonary dysplasia | |
Congenital diaphragmatic hernia Hint: A diaphragmatic hernia shows bowel in the chest from birth and is not caused by RDS treatment. | |
Cystic fibrosis Hint: Cystic fibrosis causes recurrent infections and malabsorption, not an oxygen need that follows RDS in a premature infant. | |
Persistent pulmonary hypertension of the newborn Hint: PPHN is an acute problem of the first days of life, usually in term infants. | |
Transient tachypnea of the newborn Hint: TTN resolves within 24 to 72 hours of birth. |
Question 5 Explanation:
Bronchopulmonary dysplasia (chronic lung disease of prematurity) is the main chronic complication of RDS. It is defined by a continued oxygen need at 36 weeks' postmenstrual age and results from lung immaturity plus injury from oxygen, positive-pressure ventilation, and inflammation. Prevention includes antenatal steroids, early CPAP instead of intubation, less invasive surfactant delivery, careful oxygen targets, and caffeine. Other complications of RDS and its treatment include pneumothorax, intraventricular hemorrhage, and retinopathy of prematurity.
There are 5 questions to complete.
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References: Merck Manual · UpToDate