Monday 10 September 2012

Inflammatory Bowel Disease

Inflammatory Bowel Disease
  • Inflammatory diseases of the GI tract, of unknown aetiology. Both Crohn's disease and ulcerative colitis demonstrate uncontrolled inflammation.

Crohn's disease

Epidemiology
  • Prevalence = 50-60/100000
  • More common in Caucasian races
  • Familial association
  • Genetic predisposition

Pathology
  • Any part of the gut from mouth to anus
  • Skip lesions - patchy disease with normal mucosa in between
  • Commonly terminal ileum and ascending colon
  • -> Inflammation, ulceration, abscesses and fistulae
  • Full bowel wall thickness involved
  • Inflammatory infiltrates
  • Non-caseating granulomata

Clinical features
  • Depends on the area of bowel involved
  • Mouth ulcers
  • Diarrhoea
  • Abdominal pain - colicky
  • Nausea/vomiting
  • Low-grade pyrexia
  • Generally unwell, lethargy, weight loss
  • Cutaneous fistulae (often perianal)

Disease associations
  • Small joint arthritis
  • Sacroiliitis
  • Ankylosing spondylitis
  • Iritis/uveitis/conjunctivitis
  • Erythema nodosum - tender low leg lesions
  • Pyoderma gangrenosum - skin ulceration
  • Sclerosing cholangitis

Investigations
  • Barium follow-through may show strictures, ulceration and thickened small bowel wall
  • Colonoscopy and terminal ileal biopsy
  • Proctoscopy and rectal biopsy

Management
  • 5-aminosalicylic acid (5-ASA), e.g. mesalazine
  • Steroids, e.g. prednisolone
  • Azathioprine, methotrexate
  • Anti-TNF-a antibodies (infliximab)
  • Antibiotics for perianal disease
  • Surgery for resistant disease

Extra-gastrointestinal manifestations of Crohn's disease
  • Iritis, uveitis or conjunctivitis
  • Oral ulceration
  • Ankylosing spondylitis
  • Kidney stones
  • Sacroiliitis
  • Small joint arthritis
  • Erythema nodosum
  • Primary sclerosing cholangitis
  • Gall stones
  • Pyoderma gangrenosum

Complications
  • Vitamin B12 deficiency after surgery
  • Short bowel syndrome after surgery
  • Toxic megacolon in colitis
  • Kidney stones
  • Gallstones
  • Malnutrition
  • Colonic cancer
  • Venous and arterial thromboembolism

1 comment:

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