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Bowel Obstruction (Intestinal Obstruction)

What is Obstruction (bowel obstruction)?

A bowel obstruction occurs when the normal flow of the contents of the intestine (both solid food and liquid) is partially or completely blocked. The blockage can happen anywhere in the small or large intestine and may be mechanical (physical blockage) or functional (the muscles of the intestine fail to move contents forward, known as an ileus).

The condition is a medical emergency because it can lead to bowel wall damage, loss of blood supply, perforation, and infection (peritonitis). Prompt recognition and treatment are essential for a good outcome.

Common Causes

Many different conditions can create a blockage. The most frequent culprits include:

• Adhesions – scar tissue that forms after abdominal surgery is the leading cause of small‑bowel obstruction.
• Hernias – a loop of intestine can become trapped in a weakness of the abdominal wall (inguinal, femoral, umbilical, or incisional hernias).
• Tumors – both benign and malignant growths inside or pressing on the intestine (colorectal cancer, ovarian cancer, lymphoma).
• Intussusception – one segment of intestine telescopes into an adjacent segment, most common in children.
• Volvulus – twisting of a bowel segment on its mesenteric attachment, seen in the sigmoid colon or cecum.
• Diverticulitis – inflammation or infection of diverticula can cause scar tissue or a phlegmon that blocks the colon.
• Foreign bodies or impacted stool – swallowed objects, gallstones (Bouveret syndrome), or severe fecal impaction.
• Inflammatory bowel disease (IBD) – strictures from chronic Crohn’s disease can narrow the lumen.
• Radiation therapy – scar formation after pelvic or abdominal radiation may cause late‑onset strictures.
• Mesenteric ischemia – severe loss of blood flow can lead to intestinal paralysis, mimicking a functional obstruction.

Associated Symptoms

Symptoms develop gradually or suddenly, depending on the cause and how complete the blockage is. Commonly reported signs include:

• Abdominal pain – crampy, colicky, or constant; often worsens after meals.
• Abdominal distension – a feeling of fullness or visible swelling.
• Nausea and vomiting – may become bilious (green) or feculent if obstruction is distal.
• Failure to pass gas or stool – obstipation (no flatus) is a classic red‑flag.
• Changes in bowel sounds – high‑pitched “tinkling” sounds early, then absent sounds later.
• Loss of appetite and early satiety.
• Fever or chills – may indicate infection or perforation.
• General malaise, weakness, and dehydration.

When to See a Doctor

Because a bowel obstruction can deteriorate quickly, seek medical care promptly if you experience any of the following:

• Severe or worsening abdominal pain that does not improve with over‑the‑counter pain relievers.
• Repeated vomiting, especially if it contains bile or looks like coffee grounds.
• Inability to pass gas or have a bowel movement for more than 12–24 hours.
• Abdominal swelling that becomes larger or feels hard.
• Fever ≥ 38 °C (100.4 °F), chills, or a rapid heart rate.
• Signs of dehydration – dry mouth, dizziness, scant urine.

Even milder symptoms should be evaluated if you have a recent history of abdominal surgery, known hernias, or a diagnosed cancer.

Diagnosis

The diagnostic work‑up combines a careful history, physical examination, and imaging studies.

Physical Examination

• Inspection for distension, surgical scars, or visible hernias.
• Auscultation of bowel sounds.
• Palpation for tenderness, guarding, or rigidity (signs of peritonitis).

Imaging

• Abdominal X‑ray (plain film) – often the first test; can show air–fluid levels, dilated loops, and absence of gas in the colon.
• CT scan with contrast – gold standard; identifies the exact level, cause (e.g., tumor, volvulus), degree of obstruction, and complications such as ischemia or perforation.
• Ultrasound – useful in children (intussusception) and pregnant patients.
• Contrast studies (e.g., water‑soluble contrast swallow) – can both diagnose and therapeutically assess if the obstruction is partial.

Laboratory Tests

• Complete blood count (CBC) – looks for leukocytosis (infection) or anemia.
• Electrolytes, BUN/creatinine – evaluate dehydration and metabolic disturbances.
• Lactate level – elevated lactate may signal bowel ischemia.
• Inflammatory markers (CRP, ESR) – supportive but not specific.

Treatment Options

Management depends on the obstruction’s location, cause, severity, and the patient’s overall health.

Initial (Conservative) Management

• Nil per os (NPO) – nothing by mouth to prevent further distension.
• Nasogastric (NG) tube – decompresses the stomach and reduces vomiting.
• Intravenous fluids – correct dehydration and electrolyte imbalances.
• Analgesia – typically short‑acting opioids are avoided because they may worsen ileus; acetaminophen or low‑dose IV opioids are preferred.
• Monitoring – serial abdominal exams, vital signs, and repeat labs.

Medical (Non‑surgical) Interventions

• Water‑soluble contrast therapy – in selected partial obstructions, oral contrast can both confirm and resolve the blockage (e.g., in adhesive small‑bowel obstruction).
• Endoscopic decompression – for sigmoid volvulus or colonic pseudo‑obstruction (Ogilvie’s syndrome).
• Pharmacologic agents – prokinetics (metoclopramide, erythromycin) may aid in ileus, but are not effective for mechanical obstruction.

Surgical Treatment

Surgery is required when there is:

• Complete obstruction that does not resolve with conservative measures.
• Signs of bowel ischemia, perforation, or peritonitis.
• Obstruction caused by a tumor, hernia, volvulus, or intussusception.

Procedures may include:

• Adhesiolysis – cutting scar tissue.
• Resection of diseased bowel with primary anastomosis or creation of a stoma.
• Hernia repair.
• Endoscopic or laparoscopic reduction of volvulus.

Home Care After Discharge

• Gradual re‑introduction of clear liquids, then low‑residue diet as tolerated.
• Stay well‑hydrated; consider oral rehydration solutions.
• Follow up on wound care and any drains placed during surgery.
• Report any recurrence of pain, vomiting, or changes in stool immediately.

Prevention Tips

While not all obstructions are preventable, several strategies can lower the risk:

• Maintain a high‑fiber diet and adequate fluid intake to prevent fecal impaction.
• Manage chronic conditions such as Crohn’s disease or diverticulitis with appropriate medication and regular monitoring.
• Quit smoking – it reduces the risk of abdominal cancers and poor wound healing after surgery.
• Follow postoperative instructions diligently (early ambulation, gradual diet advancement) to lessen adhesion formation.
• Seek timely repair of hernias before they enlarge.
• Discuss with your surgeon the possibility of adhesion‑reduction techniques (e.g., laparoscopic approach, use of barrier agents) if you require abdominal surgery.
• For patients on long‑term opioids, use bowel‑regimen prophylaxis (stool softeners, laxatives) to avoid opioid‑induced ileus.

Emergency Warning Signs

References

• Mayo Clinic. “Intestinal obstruction.” https://www.mayoclinic.org
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). “Bowel Obstruction.” https://www.niddk.nih.gov
• Cleveland Clinic. “Intestinal Obstruction: Symptoms, Causes & Treatment.” https://my.clevelandclinic.org
• World Health Organization. “Surgical site infection and postoperative complications.” WHO Guidelines. 2023.
• W. J. Ziegler et al., “Management of Adhesive Small‑Bowel Obstruction,” *Annals of Surgery*, 2022;275(5):924‑934.

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