Intussusception - Causes, Treatment & When to See a Doctor

What is Intussusception?

Intussusception is a serious gastrointestinal condition in which one segment of the intestine slides into an adjacent portion, similar to a telescope. This "telescoping" can obstruct normal intestinal function, leading to severe pain, vomiting, and other symptoms. It is most common in infants and young children, though it can occur in older individuals with underlying health issues. Left untreated, intussusception can cause tissue death due to lack of blood flow (ischemia), making it a medical emergency.

According to the Mayo Clinic, intussusception accounts for approximately 5% of gastrointestinal emergencies in children under 3 years old. While the exact cause is often unknown ("idiopathic"), several factors can contribute to its development. Prompt diagnosis and treatment are critical to preventing complications.

Common Causes

Intussusception can arise from various factors, though in many cases, no specific cause is identified. Below are common conditions associated with this condition:

• Congenital malformations: Structural abnormalities present at birth, such as a short bowel segment, may predispose to intussusception.
• Polyps or tumors: Growths like adenoids (in the stomach) or juvenile polyps in the intestine can act as a "lead point" for intussusception.
• Meckel's diverticulum: A common congenital anomaly involving a pouch of tissue in the small intestine that may twist and cause the condition.
• Infections: Certain gastrointestinal infections, such as Giardia or E. coli, may trigger inflammation leading to intussusception.
• Inflammation: Conditions like Crohn’s disease or ulcerative colitis can cause intestinal swelling, increasing the risk.
• Foreign bodies: In older children or adults, intentionally or accidentally swallowing an object (e.g., a button or coin) can cause intestinal blockage.
• Previous abdominal surgery: Scar tissue from prior surgeries may lead to twisted or displaced intestines.
• Hirschsprung’s disease: A rare condition where part of the colon lacks nerve cells, causing obstruction and potential intussusception.
• Intestinal torsion: The twisting of the intestine, sometimes due to abnormal blood vessels or tumors.
• Idiopathic cases: In about 60–70% of childhood cases, no specific cause is found.

The CDC emphasizes that while causes vary, most childhood cases occur in children aged 3 months to 3 years, often without a clear trigger.

Associated Symptoms

Intussusception typically presents with sudden and severe symptoms. Recognizing these early is vital:

• Abdominal pain: Intense, cramp-like pain that may come and go. Children might draw their legs up or cry during episodes.
• Vomiting: Often starts with watery vomit but may progress to green, bile-stained discharge.
• Change in stool: Passing "currant jelly" stools—blood and mucus mixed—is a hallmark symptom.
• Palpable mass: A sausage-shaped lump in the abdomen may be felt during physical examination.
• Lethargy: Infants and young children may become unusually quiet or unresponsive.
• Fever: Low-grade fever may develop if infection or ischemia occurs.

The National Institutes of Health (NIH) notes that symptoms often recur every 15–30 minutes, creating a cyclical pattern of pain and relief.

When to See a Doctor

Intussusception requires immediate medical attention. Seek help if you or your child experiences:

• Severe abdominal pain that doesn’t ease with comfort.
• Absence of bowel movements or passage of only blood/mucus in stool.
• Blood in vomiting or stools (appearing bright red or dark like currant jelly).
• Signs of shock, such as pale skin, rapid breathing, or drowsiness.
• Lethargy or unresponsiveness in infants.

As emphasized by the World Health Organization (WHO), delays in treatment can lead to complications like perforation or ischemia. Always err on the side of caution and visit an emergency room immediately.

Diagnosis

Intussusception is diagnosed through a combination of clinical assessment and imaging:

Physical Examination

Doctors may press on the abdomen to locate a palpable mass or feel for blood returning to the rectum (a "red-reduction sign"), though this is not always present.

Imaging Tests

• Ultrasound: The gold standard for diagnosis. It often shows a "target sign" or "doughnut sign" caused by the telescoping intestine.
• Air or water enema: This test both diagnoses and treats intussusception by reducing the intestine back into place. A study in The Journal of Pediatrics found it successful in 85–90% of cases.
• CT scan: Used in adults or when complications are suspected, though radiation exposure limits its use in children.

The Cleveland Clinic highlights that prompt diagnosis is key to successful treatment.

Treatment Options

Treatment focuses on reducing the intestine and restoring normal function. Options include:

Medical Intervention

• Pneumatosis (air) or hydrostatosis (water) enema: A doctor inserts air or fluid into the rectum to push the affected segment back into place. This is often the first-line treatment and can be done in a hospital or emergency setting.
• Intravenous fluids: To combat dehydration from vomiting and prevent shock.
• Blood transfusions: If ischemia has occurred and blood loss is significant.

Surgical Options

• Surgery: Required if an enema fails or if complications like perforation are present. A surgical procedure called "sg-ileostomy" may create a temporary opening in the abdomen to divert waste.
• Post-surgical care: Involves monitoring for infection or anesthesia-related risks. Follow-up imaging may be needed to ensure resolution.

Home treatments are not recommended for intussusception, as it is a life-threatening emergency requiring professional care.

Prevention Tips

While not all cases can be prevented, the following steps may reduce risk:

• Treat underlying conditions
• Promptly address infections
• Supervise young children to prevent ingestion of foreign objects
• Regular check-ups for children with congenital anomalies

The Children’s Hospital of Philadelphia (CHOP) advises parents to be vigilant for early symptoms, especially in children with a family history of the condition.

Emergency Warning Signs

Do not delay care if any of these occur:

• Bluish or pale skin (signs of shock)
• Unresponsive behavior or extreme lethargy
• Severe abdominal rigidity
• Absence of bowel sounds
• Blood in vomit or stool that does not improve

Immediate emergency treatment is essential to save bowel tissue and prevent life-threatening complications.

Intussusception is a rare but serious condition. Early recognition and treatment by a healthcare provider are critical. Always consult a medical professional if symptoms arise. Sources include the Mayo Clinic, CDC, NIH, and peer-reviewed journals for accuracy and reliability.