Duodenal Atresia

Overview

Duodenal atresia is a birth defect in which the duodenum, the first segment of the small intestine just beyond the stomach, is completely blocked. A related, milder form called duodenal stenosis means the duodenum is narrowed rather than fully closed. Because the blockage sits high in the digestive tract, food and fluid cannot pass beyond the stomach into the rest of the intestine.

The condition develops before birth, when the duodenum fails to form a proper open channel. It is often detected during pregnancy or shortly after birth and is treated successfully with surgery. Duodenal atresia is frequently associated with other conditions, including Down syndrome and certain heart defects.

Because the blockage prevents milk from passing into the intestine, affected newborns typically begin vomiting within the first day or two of life. The condition is not caused by anything the parents did during pregnancy. With timely surgery and supportive care, the outlook for babies with duodenal atresia is generally very good, though the medical team also evaluates and manages any associated conditions.

Symptoms

Signs usually appear within the first hours to days of life and include:

• Vomiting soon after birth, often bile-stained (green or yellow), though it can be clear if the blockage is above the bile duct
• Swelling of the upper abdomen with a flat lower belly
• Poor feeding
• Few or no bowel movements
• Dehydration if vomiting continues

Persistent vomiting in a newborn always needs prompt medical evaluation. Whether the vomit is green depends on where the blockage sits in relation to the bile duct, so clear vomiting does not rule out the condition. Any newborn who vomits repeatedly and is not feeding well should be assessed without delay.

Causes

Duodenal atresia results from a problem in fetal development:

• Failure of the duodenum to open: Early in pregnancy the duodenum is normally a solid cord that hollows out into an open tube; if this process fails, the channel stays closed.

The defect is not caused by anything the parents did during pregnancy. It commonly occurs alongside other congenital conditions, especially Down syndrome, heart defects, and other intestinal abnormalities.

Risk Factors

• Down syndrome (a strong association)
• Congenital heart defects
• Other intestinal or abdominal birth defects
• A pregnancy with excess amniotic fluid (polyhydramnios), which may be noted on ultrasound

Diagnosis

Duodenal atresia is often suspected before birth and confirmed afterward:

• Prenatal ultrasound: May show a characteristic "double bubble" of fluid in the stomach and upper duodenum, along with excess amniotic fluid.
• Abdominal X-ray after birth: Classically shows the same "double bubble" sign of two gas-filled pockets with little gas beyond.
• Further testing: Evaluation for associated heart defects and genetic conditions.

Treatment

Duodenal atresia is corrected with surgery:

• Stabilization: Before surgery, the baby receives intravenous fluids and a tube to empty the stomach, preventing dehydration and vomiting.
• Surgical repair (duodenoduodenostomy): The surgeon connects the segment above the blockage to the segment below it, creating a path for food to pass.
• Recovery: Feeding is gradually introduced as the intestine begins to work, and most babies do well after surgery.

Long-term outcomes are generally good, though care also addresses any associated conditions such as heart defects.

Most babies begin feeding within days to a couple of weeks after surgery as the intestine recovers and starts to move food normally. Some infants take a little longer for the upper intestine to work well, since it may have stretched before birth. The majority go on to grow and develop normally, with the surgical repair providing a lasting solution to the blockage.

Prevention

Duodenal atresia cannot be prevented because it develops before birth and is not caused by anything done during pregnancy. Prenatal ultrasound can often detect it early, allowing the delivery and surgery to be planned at a center equipped to care for the newborn, which improves outcomes.

When to See a Doctor

A newborn who vomits repeatedly, especially green or yellow (bile-stained) fluid, or who has a swollen upper belly and is not feeding well, needs urgent medical evaluation. Seek emergency care promptly, as a high intestinal blockage can quickly cause dehydration and other problems in a baby.

Related Topics

Frequently Asked Questions

References

1. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Digestive Diseases.
2. MedlinePlus, U.S. National Library of Medicine. Duodenal atresia.
3. American Pediatric Surgical Association. Duodenal Atresia and Stenosis.
4. Centers for Disease Control and Prevention (CDC). Birth Defects.