Hydrops Fetalis

What is hydrops fetalis?

Hydrops fetalis is severe swelling (edema) in the fetus or a newborn baby. It is a life-threatening problem. There are 2 types: immune and nonimmune.

What causes hydrops fetalis?

Hydrops develops when too much fluid leaves the bloodstream and goes into the tissues. Many diseases and complications can cause hydrops.

Immune hydrops

This type may develop because of Rh disease in the mother. If you are Rh negative and have an Rh positive baby, your immune system attacks your fetus’ red blood cells. This causes anemia. Hydrops can develop if developing baby's organs can't overcome the anemia. The heart starts to fail. Large amounts of fluid build up in the baby's tissues and organs. This type of hydrops is uncommon. Rh negative women are usually treated with Rh immunoglobulin to prevent problems with the baby.

Nonimmune hydrops

This type includes all other diseases or complications that may interfere with how your baby manages fluid. This is the more common type. Some of the diseases or complications include:

  • Severe anemia
  • Infections present at birth
  • Heart or lung defects
  • Chromosomal abnormalities and birth defects
  • Liver disease

What are the symptoms of hydrops fetalis?

Symptoms can occur a bit differently in each child. Below are the most common symptoms of hydrops.

During pregnancy, symptoms may include:

  • Large amounts of amniotic fluid
  • Thickened placenta
  • Ultrasound of the fetus that shows enlarged liver, spleen, or heart. It may show a fluid buildup around the fetus' abdomen, heart, and lungs.

After birth, symptoms may include:

  • Pale coloring
  • Severe swelling overall, especially in the baby's belly (abdomen)
  • Trouble breathing
  • Enlarged liver and spleen

The symptoms of hydrops may look like other health conditions. Make sure your baby sees his or her healthcare provider for a diagnosis.

How is hydrops fetalis diagnosed?

In addition to a physical exam, your baby may need these tests:

  • Ultrasound. This test uses sound waves to create images of blood vessels, tissues, and organs. The doctor will use the ultrasound to look at how your baby's internal organs are working. He or she can see how blood flows through various vessels.
  • Fetal blood sampling. This is done by placing a needle through the mother's uterus and into a blood vessel of the fetus or the umbilical cord.
  • Amniocentesis. This test Involves withdrawing some of the amniotic fluid around the fetus for testing.

How is hydrops fetalis treated?

Treatment of hydrops depends on the cause. During pregnancy, hydrops may be treatable only in certain cases. You may need early delivery. In a newborn baby, treatment may include:

  • Help for breathing problems. This may be with extra oxygen or a breathing machine (ventilator)
  • Removing extra fluid from spaces around the lungs and abdomen using a needle

What are the complications of hydrops fetalis?

The severe swelling that occurs with hydrops can overwhelm the baby's organ systems. About half of unborn babies with hydrops do not survive. Risks for other complications are also high for babies born with hydrops. Survival often depends on the cause and treatment.

Key points about hydrops fetalis

  • Hydrops fetalis is severe swelling (edema) in the fetus or newborn baby. It is a life-threatening problem.
  • Hydrops develops when too much fluid leaves the baby's bloodstream and goes into the tissues.
  • Treatment of hydrops depends on the cause.
  • About half of unborn babies with hydrops do not survive.

Next steps

Tips to help you get the most from a visit to your child’s healthcare provider:

  • Know the reason for the visit and what you want to happen.
  • Before your visit, write down questions you want answered.
  • At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you for your child.
  • Know why a new medicine or treatment is prescribed and how it will help your child. Also know what the side effects are.
  • Ask if your child’s condition can be treated in other ways.
  • Know why a test or procedure is recommended and what the results could mean.
  • Know what to expect if your child does not take the medicine or have the test or procedure.
  • If your child has a follow-up appointment, write down the date, time, and purpose for that visit.
  • Know how you can contact your child’s provider after office hours. This is important if your child becomes ill and you have questions or need advice.