Skip Lesions and Inflammation

Skip lesions are characterized by patchy and scattered inflammation, along with full-thickness (transmural) inflammation in the gastrointestinal tract. This condition may lead to various complications, including:

  • Fistulas: Abnormal tunnel formations between different sites such as bowel-to-bowel, bowel-to-bladder, or bowel-to-skin, which can worsen abscess formations.
  • Strictures: Narrowing of the bowel due to swelling and scar tissue formation, which may result in obstruction.
  • Abscesses: Collections of pus that can form within the bowel wall.
  • Malnutrition: Particularly prevalent in cases affecting the ileum.
  • Increased risk of colorectal cancer: This risk is notably elevated in patients with extensive disease.
Risk Factors

Several factors are associated with the onset and exacerbation of Crohn’s disease:

  • Genetics: A strong family history is associated with the condition.
  • Smoking: Identified as a major risk factor that can worsen the disease.
  • Western Diet: Diets high in fat and low in fiber may contribute to disease severity.
  • Stress: Stress is known to exacerbate symptoms.
Symptoms and Clinical Manifestations

Patients often present with chronic non-bloody diarrhea, abdominal pain (particularly in the right lower quadrant), weight loss, fatigue, and potential abscess formation within the bowel wall. Patients may also experience mouth or gastrointestinal ulcers.

Diagnostic Evaluation
  • Colonoscopy with Biopsy: This is the gold standard for diagnosis, revealing distinct skip lesions, a cobblestone appearance of the mucosa, and evidence of transmural inflammation.
Pathophysiology

Crohn’s disease is characterized by a dysregulated immune response in the gastrointestinal tract. The immune system overreacts to the gut microbiota, leading to chronic inflammation that extends through the bowel wall, resulting in ulceration, thickening of the bowel, and fibrosis. Structural changes include:

  • Skip lesions: Segments of normal bowel interspersed with diseased segments.
  • Cobblestone mucosa: This appearance stems from deep ulcers in the intestinal lining.
  • Fistulas: Abnormal connections between bodily parts.
  • Strictures: Narrowing caused by fibrosis.
Complications

Patients with Crohn’s disease may encounter various complications, including:

  • Increased risk of colorectal cancer.
  • Fistulas and strictures that require surgical intervention.
Red Flags for Advanced Disease

Symptoms indicating progression or advanced disease include:

  • Fever
  • Symptoms of bowel obstruction: Cramping and abdominal distension.
  • Drainage from fistulas.
Extraintestinal Manifestations

Crohn's disease is associated with several extraintestinal symptoms:

  • Joint Pain: Often manifests as arthritis.
  • Skin Conditions: Such as erythema nodosum.
  • Eye Conditions: Such as uveitis.
  • Liver Disease: Including primary sclerosing cholangitis.
Considerations for Older Adults

Older adults may have a long disease duration, increasing the risk for complications and malnutrition.

Treatment Goals

The primary goals in managing Crohn’s disease focus on symptom management. Treatment includes:

  • Anti-Inflammatory Medications: Such as 5-Aminosalicylates (5-ASA), which are generally less effective for Crohn’s compared to ulcerative colitis (UC).
  • Bowel Resection: In cases where bowel sections are notably affected.
Lifestyle Considerations

Patients should avoid smoking, high-fat foods if they trigger symptoms, hard-to-digest foods (like nuts and raw vegetables), and foods that cause gas (like beans and onions).

Imaging and Laboratory Findings

CT or MR enterography can detect fistulas, abscesses, and thickening of the bowel walls. Common laboratory findings include elevated C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), along with possible anemia due to iron or vitamin B12 deficiencies, and electrolyte imbalances caused by chronic diarrhea and malabsorption.

Fluid and Electrolyte Management

Due to chronic diarrhea, monitoring for dehydration and complications like hypokalemia, weight loss, and nutritional deficiencies is critical.

Medical Treatment
  • Medications:
    • Corticosteroids for acute flares: Used for rapid symptom control, typically not for long-term therapy.
    • Immunomodulators: Examples include Azathioprine and Methotrexate.
    • Biologics: Such as anti-TNF agents targeting immune pathways.
    • Antibiotics: Utilized for abscesses and fistulas; also during flares to prevent infection.
  • Surgical Intervention: Indicated for obstructions, abscesses, and fistulas.
  • Lifestyle Management: Emphasis on nutrient-dense foods, small frequent meals, and hydration, with a low-residue diet during flares.
Nursing Role

Nurses should assess stool patterns, pain levels, nutritional status, and weight trends; provide nutritional support; manage medications; and control symptoms. They must also monitor for potential complications such as abscesses, obstruction, infection, and malnutrition.