Respiratory distress syndrome (RDS) is a breathing disorder that affects newborns. RDS rarely occurs in full-term infants. The disorder is more common in premature infants born about 6 weeks or more before their due dates.
RDS is more common in premature infants because their lungs aren't able to make enough surfactant (sur-FAK-tant). Surfactant is a liquid that coats the inside of the lungs. It helps keep them open so that infants can breathe in air once they're born.
Without enough surfactant, the lungs collapse and the infant has to work hard to breathe. He or she might not be able to breathe in enough oxygen to support the body's organs. The lack of oxygen can damage the baby's brain and other organs if proper treatment isn't given.
Most babies who develop RDS show signs of breathing problems and a lack of oxygen at birth or within the first few hours that follow.
RDS is a common lung disorder in premature infants. In fact, nearly all infants born before 28 weeks of pregnancy develop RDS.
RDS might be an early phase of bronchopulmonary dysplasia (brong-ko-PUL-mo-nar-e dis-PLA-ze-ah), or BPD. This is another breathing disorder that affects premature babies.
RDS usually develops in the first 24 hours after birth. If premature infants still have breathing problems by the time they reach their original due dates, they may be diagnosed with BPD. Some of the life-saving treatments used for RDS may cause BPD.
Some infants who have RDS recover and never get BPD. Infants who do get BPD have lungs that are less developed or more damaged than the infants who recover.
Infants who develop BPD usually have fewer healthy air sacs and tiny blood vessels in their lungs. Both the air sacs and the tiny blood vessels that support them are needed to breathe well.
Due to improved treatments and medical advances, most infants who have RDS survive. However, these babies may need extra medical care after going home.
Some babies have complications from RDS or its treatments. Serious complications include chronic (ongoing) breathing problems, such as asthma and BPD; blindness; and brain damage.
The main cause of respiratory distress syndrome (RDS) is a lack of surfactant in the lungs. Surfactant is a liquid that coats the inside of the lungs.
A fetus's lungs start making surfactant during the third trimester of pregnancy (weeks 26 through labor and delivery). The substance coats the insides of the air sacs in the lungs. This helps keep the lungs open so breathing can occur after birth.
Without enough surfactant, the lungs will likely collapse when the infant exhales (breathes out). The infant then has to work harder to breathe. He or she might not be able to get enough oxygen to support the body's organs.
Some full-term infants develop RDS because they have faulty genes that affect how their bodies make surfactant.
Certain factors may increase the risk that your infant will have respiratory distress syndrome (RDS). These factors include:
Your baby also is at greater risk for RDS if you require an emergency cesarean delivery (C-section) before your baby is full term. You may need an emergency C-section because of a condition, such as a detached placenta, that puts you or your infant at risk.
Planned C-sections that occur before a baby's lungs have fully matured also can increase the risk of RDS. Your doctor can do tests before delivery that show whether it's likely that your baby's lungs are fully developed. These tests assess the age of the fetus or lung maturity.
Signs and symptoms of respiratory distress syndrome (RDS) usually occur at birth or within the first few hours that follow. They include:
The infant also may have pauses in breathing that last for a few seconds. This condition is called apnea (AP-ne-ah).
Depending on the severity of an infant's RDS, he or she may develop other medical problems.
Lung complications may include a collapsed lung (atelectasis), leakage of air from the lung into the chest cavity (pneumothorax), and bleeding in the lung (hemorrhage).
Some of the life-saving treatments used for RDS may cause bronchopulmonary dysplasia, another breathing disorder.
Infants who have RDS may develop sepsis, an infection of the bloodstream. This infection can be life threatening.
Lack of oxygen may prevent a fetal blood vessel called the ductus arteriosus from closing after birth as it should. This condition is called patent ductus arteriosus, or PDA.
The ductus arteriosus connects a lung artery to a heart artery. If it remains open, it can strain the heart and increase blood pressure in the lung arteries.
Complications of RDS also may include blindness and other eye problems and a bowel disease called necrotizing enterocolitis (EN-ter-o-ko-LI-tis). Infants who have severe RDS can develop kidney failure.
Some infants who have RDS develop bleeding in the brain. This bleeding can delay mental development. It also can cause mental retardation or cerebral palsy.
Respiratory distress syndrome (RDS) is common in premature infants. Thus, doctors usually recognize and begin treating the disorder as soon as babies are born.
Doctors also do several tests to rule out other conditions that could be causing an infant's breathing problems. The tests also can confirm that the doctors have diagnosed the condition correctly.
The tests include:
Treatment for respiratory distress syndrome (RDS) usually begins as soon as an infant is born, sometimes in the delivery room.
Most infants who show signs of RDS are quickly moved to a neonatal intensive care unit (NICU). There they receive around-the-clock treatment from health care professionals who specialize in treating premature infants.
The most important treatments for RDS are:
Surfactant is a liquid that coats the inside of the lungs. It helps keep them open so that an infant can breathe in air once he or she is born.
Babies who have RDS are given surfactant until their lungs are able to start making the substance on their own. Surfactant usually is given through a breathing tube. The tube allows the surfactant to go directly into the baby's lungs.
Once the surfactant is given, the breathing tube is connected to a ventilator, or the baby may get breathing support from NCPAP.
Surfactant often is given right after birth in the delivery room to try to prevent or treat RDS. It also may be given several times in the days that follow, until the baby is able to breathe better.
Some women are given medicines called corticosteroids during pregnancy. These medicines can speed up surfactant production and lung development in a fetus. Even if you had these medicines, your infant may still need surfactant replacement therapy after birth.
Infants who have RDS often need breathing support until their lungs start making enough surfactant. Until recently, a mechanical ventilator usually was used. The ventilator was connected to a breathing tube that ran through the infant's mouth or nose into the windpipe.
Today, more and more infants are receiving breathing support from NCPAP. NCPAP gently pushes air into the baby's lungs through prongs placed in the infant's nostrils.
Infants who have breathing problems may get oxygen therapy. Oxygen is given through a ventilator or NCPAP machine, or through a tube in the nose. This treatment ensures that the infants' organs get enough oxygen to work well.
For more information, go to the Health Topics Oxygen Therapy article.
Other treatments for RDS include medicines, supportive therapy, and treatment for patent ductus arteriosus (PDA). PDA is a condition that affects some premature infants.
Doctors often give antibiotics to infants who have RDS to control infections (if the doctors suspect that an infant has an infection).
Treatment in the NICU helps limit stress on babies and meet their basic needs of warmth, nutrition, and protection. Such treatment may include:
PDA is a possible complication of RDS. In this condition, a fetal blood vessel called the ductus arteriosus doesn't close after birth as it should.
The ductus arteriosus connects a lung artery to a heart artery. If it remains open, it can strain the heart and increase blood pressure in the lung arteries.
PDA is treated with medicines, catheter procedures, and surgery. For more information, go to the Health Topics Patent Ductus Arteriosus article.
Taking steps to ensure a healthy pregnancy might prevent your infant from being born before his or her lungs have fully developed. These steps include:
If you're having a planned cesarean delivery (C-section), your doctor can do tests before delivery to show whether it's likely that your baby's lungs are fully developed. These tests assess the age of the fetus or lung maturity.
Your doctor may give you injections of a corticosteroid medicine if he or she thinks you may give birth too early. This medicine can speed up surfactant production and development of the lungs, brain, and kidneys in your baby.
Treatment with corticosteroids can reduce your baby's risk of respiratory distress syndrome (RDS). If the baby does develop RDS, it will probably be fairly mild.
Corticosteroid treatment also can reduce the chances that your baby will have bleeding in the brain.
Caring for a premature infant can be challenging. You may experience:
You can take steps to help yourself during this difficult time. For example, take care of your health so that you have enough energy to deal with the situation.
Learn as much as you can about what goes on in the NICU. You can help your baby during his or her stay there and begin to bond with the baby before he or she comes home.
Learn as much as you can about your infant's condition and what's involved in daily care. This will allow you to ask questions and feel more confident about your ability to care for your baby at home.
Seek out support from family, friends, and hospital staff. Ask the case manager or social worker at the hospital about what you'll need after your baby leaves the hospital. The doctors and nurses can assist with questions about your infant's care. Also, you may want to ask whether your community has a support group for parents of premature infants.
Parents are encouraged to visit their baby in the NICU as much as possible. Spend time talking to your baby and holding and touching him or her (when allowed).
Your baby may need special care after leaving the NICU, including:
Talk to your child's doctor about ongoing care for your infant and any other medical concerns you have.
The National Heart, Lung, and Blood Institute (NHLBI) is strongly committed to supporting research aimed at preventing and treating heart, lung, and blood diseases and conditions and sleep disorders.
NHLBI-supported research has led to many advances in medical knowledge and care. However, many questions remain about various diseases and conditions, including respiratory distress syndrome (RDS).
The NHLBI continues to support research aimed at learning more about RDS. For example, NHLBI-supported research includes studies that explore:
Much of this research depends on the willingness of volunteers to take part in clinical trials. Clinical trials test new ways to prevent, diagnose, or treat various diseases and conditions.
For example, new treatments for a disease or condition (such as medicines, medical devices, surgeries, or procedures) are tested in volunteers who have the illness. Testing shows whether a treatment is safe and effective in humans before it is made available for widespread use.
By taking part in a clinical trial, your child may gain access to new treatments before they're widely available. Your child also will have the support of a team of health care providers, who will likely monitor his or her health closely. Even if your child doesn't directly benefit from the results of a clinical trial, the information gathered can help others and add to scientific knowledge.
Children (aged 18 and younger) get special protection as research subjects. Almost always, parents must give legal consent for their child to take part in a clinical trial.
When researchers think that a trial's potential risks are greater than minimal, both parents must give permission for their child to enroll. Also, children aged 7 and older often must agree (assent) to take part in clinical trials.
If you agree to have your child take part in a clinical trial, you'll be asked to sign an informed consent form. This form is not a contract. You have the right to withdraw your child from a study at any time, for any reason. Also, you have the right to learn about new risks or findings that emerge during the trial.
For more information about clinical trials related to RDS, talk with your doctor. For more information about clinical trials for children, visit the NHLBI's Children and Clinical Studies Web page.
You also can visit the following Web sites to learn more about clinical research and to search for clinical trials:
The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.