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Necrotizing Enterocolitis (NEC) - Definition & Treatment

Necrotizing enterocolitis is a serious intestinal disease affecting primarily premature infants, requiring immediate medical attention and intensive care treatment.

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Things worth knowing about "Necrotizing Enterocolitis"

Necrotizing enterocolitis is a serious intestinal disease affecting primarily premature infants, requiring immediate medical attention and intensive care treatment.

What is Necrotizing Enterocolitis?

Necrotizing enterocolitis (abbreviated NEC) is a severe, life-threatening intestinal disease that primarily affects premature infants and newborns with very low birth weight. The condition involves inflammation of the intestinal wall that can, in the most serious cases, lead to tissue death (necrosis) of segments of the bowel. NEC is one of the most common and dangerous gastrointestinal emergencies in neonatal medicine.

Causes

The exact causes of necrotizing enterocolitis have not yet been fully established. However, it is believed that multiple factors interact to trigger the disease:

Prematurity: Premature infants have an immature gut and an underdeveloped immune system, making them especially vulnerable.
Imbalanced gut microbiome: A disruption of the bacterial balance in the intestine (dysbiosis) may contribute to the development of NEC.
Damage to the intestinal lining: Reduced blood flow (ischemia) or infections can damage the intestinal mucosa and trigger inflammatory responses.
Feeding practices: The introduction of formula feeding, particularly cow's milk-based formula, is discussed as a possible risk factor.
Infections: Bacterial, viral, or fungal infections can trigger or worsen NEC.

Symptoms

The symptoms of necrotizing enterocolitis can develop gradually or progress very rapidly. Typical signs include:

Swollen, rigid abdomen (abdominal distension)
Feeding intolerance or increased gastric residuals when tube-feeding
Blood in the stool
Vomiting, sometimes bilious (green)
General deterioration of condition (lethargy, pallor)
Temperature instability (hypothermia or fever)
Breathing difficulties and circulatory instability in severe cases

Diagnosis

The diagnosis of necrotizing enterocolitis is based on a combination of clinical assessment, laboratory tests, and imaging:

Abdominal X-ray: The presence of gas within the intestinal wall (pneumatosis intestinalis) or free air in the abdominal cavity is a hallmark sign of NEC.
Ultrasound: Can be used to evaluate the intestinal wall and the abdominal cavity for signs of NEC.
Laboratory tests: Elevated inflammatory markers (CRP, white blood cell count), blood count changes, and acid-base imbalances may indicate NEC.
Blood culture: Used to detect bloodstream infection (sepsis), which can occur as a complication.

The severity of the disease is commonly classified using the Bell staging criteria, which define three stages of NEC.

Treatment

Treatment of necrotizing enterocolitis depends on the severity of the disease and includes both medical and surgical approaches:

Medical (Conservative) Treatment

Bowel rest: All oral or enteral feeding is stopped, and nutrition is provided intravenously (parenteral nutrition).
Antibiotic therapy: To treat and prevent infections.
Gastric decompression: A nasogastric tube is placed to relieve pressure in the intestine.
Intensive care monitoring: Close monitoring of vital signs, laboratory values, and imaging.

Surgical Treatment

Surgery is required in cases of intestinal perforation, peritonitis, or failure to respond to medical management.
During surgery, necrotic bowel segments are removed (resection) and, if necessary, a temporary stoma (enterostomy) is created.

Prognosis and Complications

Necrotizing enterocolitis carries a high mortality rate, particularly among very premature infants. Long-term complications may include:

Short bowel syndrome following extensive intestinal resections
Neurodevelopmental impairments
Scar-related narrowing of the intestine (stricture)
Chronic gastrointestinal problems

Prevention

Several measures are recommended to reduce the risk of necrotizing enterocolitis:

Breast milk feeding: Human breast milk is considered the most important protective factor, as it contains antibodies and bioactive substances that support intestinal development.
Probiotics: Administration of certain probiotic strains to premature infants may reduce the risk of NEC (under medical supervision).
Antenatal corticosteroids: Administration of corticosteroids before birth in cases of threatened preterm delivery promotes lung maturity and may also have a protective effect on the gut.

References

Neu J, Walker WA. Necrotizing Enterocolitis. New England Journal of Medicine. 2011;364(3):255-264.
World Health Organization (WHO). Born Too Soon: The Global Action Report on Preterm Birth. Geneva: WHO; 2012.
Alfaleh K, Anabrees J. Probiotics for prevention of necrotizing enterocolitis in preterm infants. Cochrane Database of Systematic Reviews. 2014;(4):CD005496.

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