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Duodenal Atresia – Causes, Symptoms and Treatment

Duodenal atresia is a congenital malformation in which the duodenum, the first section of the small intestine, is completely blocked. It requires surgical treatment and is often associated with other birth defects.

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Things worth knowing about "Duodenal Atresia"

Duodenal atresia is a congenital malformation in which the duodenum, the first section of the small intestine, is completely blocked. It requires surgical treatment and is often associated with other birth defects.

What is Duodenal Atresia?

Duodenal atresia is a congenital malformation of the gastrointestinal tract in which the duodenum – the first part of the small intestine immediately following the stomach – is completely blocked or severely narrowed. This prevents food and gastric contents from passing through the digestive tract. The condition belongs to the group of intestinal atresias and occurs in approximately 1 in 5,000 to 10,000 live births.

Causes and Development

Duodenal atresia develops during fetal development, typically between the 4th and 10th week of pregnancy. During this period, the intestinal lumen normally undergoes recanalization – a process in which the initially solid intestinal tube reopens. If this process fails to occur or is incomplete, an atresia (complete obstruction) or stenosis (partial narrowing) results.

Intrinsic causes: Failure of recanalization of the duodenal lumen during embryonic development
Extrinsic causes: Compression by an annular pancreas, a ring of pancreatic tissue that encircles and compresses the duodenum from the outside
Associated chromosomal abnormalities: Approximately 25–40% of cases are associated with Trisomy 21 (Down syndrome)
Additional malformations: Congenital heart defects, esophageal atresia, intestinal malrotation, and other gastrointestinal anomalies frequently occur alongside duodenal atresia

Symptoms

Symptoms of duodenal atresia typically appear shortly after birth:

Bilious (green) vomiting shortly after the first feeding (when the atresia is located below the opening of the bile duct)
Distended upper abdomen combined with a scaphoid (flat) lower abdomen
Absence of meconium (the newborn first stool) in severe cases
Dehydration and electrolyte imbalances caused by persistent vomiting

Duodenal atresia can often be detected prenatally through the characteristic double-bubble sign on ultrasound: two fluid-filled bubbles are visible in the fetal abdomen – one representing the stomach and one representing the distended duodenum proximal to the obstruction. Polyhydramnios (excess amniotic fluid) may also be present, as the fetus is unable to swallow and reabsorb amniotic fluid normally.

Diagnosis

The diagnosis can be established prenatally or postnatally:

Prenatal diagnosis: Ultrasound examination revealing the double-bubble sign and possible polyhydramnios; amniocentesis may be performed to rule out chromosomal abnormalities such as Trisomy 21
Postnatal diagnosis: Clinical presentation, abdominal X-ray showing the classic double-bubble appearance, and contrast studies if needed to localize the obstruction precisely
Laboratory tests: Blood gas analysis and electrolyte measurement to assess metabolic disturbances caused by vomiting

Treatment

Duodenal atresia is treated exclusively by surgical intervention. The procedure is typically performed within the first few days of life, after the newborn has been stabilized.

Surgical Approach

The standard procedure is a duodenoduodenostomy, in which a direct connection (anastomosis) is created between the dilated, blind-ending duodenum above the obstruction and the normal duodenum below it. Alternatively, a duodenojejunostomy (connection to the jejunum) may be performed. If an annular pancreas is present, it is not divided; instead, a bypass anastomosis is created around it.

Postoperative Care

Parenteral nutrition (intravenous delivery of nutrients) until full intestinal function is restored
Gradual introduction of enteral feeding (nutrition via the gastrointestinal tract)
Regular follow-up examinations to monitor growth and intestinal function

Prognosis

With timely surgical repair, the overall prognosis for duodenal atresia is favorable. Survival rates exceed 90% with modern surgical care. Long-term outcomes are largely determined by the presence of associated anomalies, particularly congenital heart defects or Trisomy 21. In uncomplicated cases, affected children often develop normally following successful surgery.

References

Puri P., Hollwarth M.E. (eds.): Pediatric Surgery. Springer, Berlin/Heidelberg, 2006.
Stollman T.H. et al.: Associations of duodenal atresia with other congenital anomalies. European Journal of Pediatrics, 168(8):983–987, 2009. PubMed PMID: 19009321.
World Health Organization (WHO): Global Registry and Database on Craniofacial Anomalies. WHO Press, Geneva, 2003.

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