Colonic Atresia – Causes, Symptoms and Treatment
Colonic atresia is a rare congenital malformation in which the large intestine (colon) is completely or partially obstructed. It is a neonatal emergency that typically requires surgical treatment shortly after birth.
Wissenswertes über "Colonic Atresia"
Colonic atresia is a rare congenital malformation in which the large intestine (colon) is completely or partially obstructed. It is a neonatal emergency that typically requires surgical treatment shortly after birth.
What is Colonic Atresia?
Colonic atresia is a rare congenital malformation of the large intestine (colon) in which one or more segments are completely closed or interrupted, preventing the passage of intestinal contents. It belongs to the group of intestinal atresias and occurs in approximately 1 in 20,000 to 40,000 live births. Colonic atresia represents a neonatal emergency requiring prompt medical intervention.
Causes
The exact cause of colonic atresia is not fully understood. The following factors are considered possible contributors:
- Vascular insufficiency: Inadequate blood supply to the developing bowel during fetal development is considered the most common cause. Local ischemia can lead to tissue necrosis and subsequent atresia.
- In utero volvulus: Twisting of the bowel before birth can interrupt blood supply and cause atresia.
- In utero intussusception: Telescoping of one bowel segment into another during pregnancy may also result in atresia.
- Genetic factors: Rare familial cases suggest a possible genetic component.
Symptoms
Symptoms of colonic atresia typically appear shortly after birth and include:
- Failure to pass meconium: The newborn does not pass meconium (first stool) within the expected timeframe.
- Abdominal distension: The abdomen appears markedly swollen and tense.
- Vomiting: Bilious or greenish vomiting is common and indicates intestinal obstruction.
- Poor feeding and irritability: The infant feeds poorly and may appear restless or lethargic.
- Signs of ileus: General signs of bowel obstruction, including increasing abdominal distension and pain.
Diagnosis
Diagnosis is based on a combination of clinical findings and imaging studies:
Prenatal Diagnosis
In some cases, colonic atresia may be suspected before birth via prenatal ultrasound if dilated bowel loops or polyhydramnios (excess amniotic fluid) are detected.
Postnatal Diagnosis
- Abdominal X-ray: Demonstrates dilated bowel loops and absence of gas in the distal colon.
- Contrast enema: A contrast study of the colon can identify the location and extent of the atresia and may reveal a microcolon (underdeveloped colon distal to the obstruction).
- Ultrasound: Used to assess bowel structure and identify associated anomalies.
Treatment
Treatment of colonic atresia is exclusively surgical and must be performed as soon as possible after diagnosis.
Surgical Treatment
The goal of surgery is to restore bowel continuity. Depending on the severity and location of the atresia, the following procedures may be performed:
- Resection with primary anastomosis: The atretic bowel segment is removed and the remaining ends are directly joined together.
- Stoma formation: In severe cases or when the newborn is clinically unstable, a temporary ostomy (artificial bowel opening) may be created first, with definitive bowel reconstruction performed in a second procedure.
Postoperative Care
After surgery, newborns require intensive care monitoring. Parenteral nutrition (intravenous nutrient delivery) supports the infant until normal bowel function is restored. Long-term complications such as short bowel syndrome or motility disorders may occur, particularly if extensive bowel resection was necessary.
Prognosis
The prognosis for colonic atresia has improved significantly with advances in neonatal intensive care and pediatric surgery. With early diagnosis and uncomplicated surgery, the long-term outcome is favorable in many cases, with survival rates exceeding 90%. Associated anomalies, such as Hirschsprung-like innervation defects or cardiovascular malformations, may influence overall prognosis.
References
- Dalla Vecchia L.K. et al. - Intestinal atresia and stenosis: a 25-year experience with 277 cases. In: Archives of Surgery, 1998; 133(5):490-496.
- Rothenberg S.S. - Colonic atresia. In: Seminars in Pediatric Surgery, 2022; 31(2):151154.
- Puri P., Hollwarth M.E. (Eds.) - Pediatric Surgery. Springer, Berlin/Heidelberg, 2nd edition, 2009.
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