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Inflammatory Bowel Disease Inflammatory Bowel Disease

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Inflammatory Bowel Disease Inflammatory Bowel Disease CHAPTER 1 Inflammatory bowel disease Inflammatory bowel disease refers to two chronic diseases that cause inflammation of the intestines: ulcerative colitis and Crohn's disease. Although the diseases have some features in common, there are some important differences. Inflammatory bowel disease Medical research hasn't determined yet what causes inflammatory bowel disease. But researchers believe that a number of factors may be involved, such as environment diet possibly genetics Inflammatory bowel disease Current evidence suggests that there's likely a genetic defect that affects how our immune system works and how the inflammation is turned on and off in those people with inflammatory bowel disease, in response to an offending agent, like: bacteria a virus or a protein in food Epidemiology of IBD Ulcerative colitis Crohn’s disease Incidence (US) 11/100 000 7/100 000 Age of onset 15-30 & 60-80 15-30 & 60-80 Male:female ratio 1:1 1,1-1,8:1 Smoking May prevent May cause disease disease Oral contraceptive No increased risk Relative risk 1,9 Appendectomy Not protective Protective Monozygotic twins 8% concordance 67% concordance Ulcerative colitis – microscopic features Process is limited to the mucosa and submucosa with deeper layer unaffected Two major histologic features: - the crypt architecture of the colon is distorted - some patients have basal plasma cells and multiple basal lymphoid aggregates Ulcerative colitis is an inflammatory disease of the large intestine, also called the colon. In ulcerative colitis, the inner lining - or mucosa -of the intestine becomes inflamed and develops ulcers is often the most severe in the rectal area, which can cause frequent diarrhea. Ulcerative colitis – macroscopic features 40-50% of patients have disease limited to the rectum and rectosigmoid 30-40% of patients have disease extending beyond the sigmoid 20% of patients have a total colitis Proximal spread occurs in continuity without areas of uninvolved mucosa Ulcerative colitis – macroscopic features Mucosa is : - erythematous, has a granular surface that looks like a sand paper In more severe diseases: - hemorrhagic, edematous and ulcerated In fulminant disease a toxic colitis or a toxic megacolon may develop ( wall become very thin and mucosa is severly ulcerated) Ulcerative colitis – clinical presentation The major symptoms of UC are: - diarrhea - rectal bleeding - tenesmus - passage of mucus - crampy abdominal pain Ulcerative colitis – clinical presentation Patients with proctitis usually pass fresh blood or blood- stained mucus either mixed with stool or streaked onto the surface of normal or hard stool When the disease extends beyond the rectum, blood is usually mixed with stool or grossly bloody diarrhea may be noted When the disease is severe, patients pass a liquid stool containing blood, pus, fecal matter Other symptoms in moderate to severe disease include: anorexia, nausea, vomitting, fever, weight loss Radiologic change of UC Fine mucosal granularity Mucosa become thickenned and superficial ulcers are seen (collar-button ulcers) Loss of haustration Ulcerative colitis - complication Hemorrhage Perforation Stricture Toxic megacolon (transverse colon with a diameter of more than 5,0 cm to 6,0 cm with loss of haustration) UC – disease presentation MILD MODERATE SEVERE BOWEL < 4 per day 4-6 per day >6 per day MOVEMENTS BLOOD IN small moderate Severe STOOL FEVER none <37,5 C > 37,5 C TACHYCARDIA none <90 mean >90 mean pulse pulse UC – disease presentation MILD MODERATE SEVERE ANEMIA mild >75% <75% SEDIMENTATION <30mm >30mm RATE ENDOSCOPIC Erythema, Marked erythema, Spontaneous APPEARANCE decreased vascular coarse granularity, bleeding, ulceration pattern, fine contact bleeding, no granularity ulceration Crohn’s disease Crohn's disease differs from ulcerative colitis in the areas of the bowel it involves - it most commonly affects the last part of the small intestine and parts of the large intestine. Crohn's disease isn't limited to these areas and can attack any part of the digestive tract Crohn's disease generally tends to involve the entire bowel wall Crohn’s disease – macroscopic features Can affect any part of GI tract from the mouth to the anus 30-40% of patients have small bowel disease alone 40-55% of patients have both small and large intestines disease 15-25% of patients have colitis alone In 75% of patients with small intestinal disease the terminal ileum in involved in 90% Distribution of gastrointestinal Crohn's disease. Based on data from American Gastroenterological Association. Crohn’s disease – macroscopic features CD is a transmural process CD is segmental with skip areas in the midst of diseased intestine In one –third of patients with CD perirectal fistulas, fissures, abscesses, anal stenosis are present Crohn’s disease – macroscopic features mild disease is characterized by: aphtous or small superficial ulcerations In more active disease: stellate ulcerations fuse longitudinally and transversely to demarcate island of mucosa that are histologically normal Cobblestone appearance is characteristic of CD (both endoscopically and by barium radiography) Crohn’s disease – macroscopic features Active CD is characterized by focal inflammation and formation of fistula tracts The bowel wall thickens and becomes narrowed and fibrotic, leading to chronic, recurrent bowel obstruction Crohn’s disease – macroscopic features Aphtoid ulceration and focal crypt abscesses with loose aggregation of macrophages which form granulomas Transmural inflammation that is accompanied by fissures that penetrate deeply into the bowel wall Crohn’s disease – sign and symptoms Ileocolitis - right lower quadrant pain and diarhhea - palpable mass, fever and leucocytosis - pain is colickly and relieved by defecation Jejunoileitis - inflammatory disease is associated with loss of digestive and absorptive surface Crohn’s disease – sign and symptoms Colitis and perianal disease - low grade fever, malaise, diarrhea, crampy abdominal pain, sometimes hematochezia - pain is caused by passage of fecal material through narrowed and inflamed segments of large bowel Gastroduodenal disease - nusea, vomiting, epigastric pain - second portion of duodenum is more commonly involved than the bulb IBD is associated with variety of extraintestinal menifestation. Almost one-third of the patients have at least one. Extraintestinal manifestation Dermatologic 1. Erythema nodosum occurs in up to 15% of CD patients and 10% of UC patients The lesions of EN are hot, red, tender nodules measuring to 5cm in diameter and are found on the anterior surface of the legs, ankles, calves, thighs and arms 2. Pyoderma gangrenosum (PG) is seen in 1 to 12% of UC patients and is less common in CD colitis. PG may occur years before the onset of bowel symptoms. Lesions are common on the dorsal surface of the feet and legs but may occur on the arms, chest and even face. Extraintestinal manifestation Rheumatologic Peripherial arthritis developes in 15 to 20% of IBD patients, is more common in CD. It is asymmetric, polyarticular and migratory. Most often affects large joints of the upper and lower extremities Ankylosing spondylosis (AS) occurs in 10% of IBD. Sacroilitis is symetrical, occurs equally in UC and CD, often asymptomatic Extraintestinal manifestation Ocular The incidence of ocular complications in IBM patients is 1 to 10% The most common is conjunctivitis, anterior uveitis, episcleritis Symptoms include: ocular pain, photophobia, blurred vision, headache Extraintestinal manifestation Urologic The most frequent genitourinary complications are: calculi, ureteral obstruction, fistulas The highest frequency of nephrolithiasis (10-20%) occurs in patients with CD. Patients with IBD have an increased prevelance of osteoporosis secondary to vitamin D deficiency, calcium malabsorbtion, malnutrition, corticosteroid use More common cardiopulmonary manifestations include endocarditis, myocarditis, pleuropericarditis and interstitial lung disease. Different clinical features UC Crohn’s disease Blood in stool Yes Occasionally Mucus Yes Occasionally Systemic Occasionally Frequently symptoms Pain Occasionally Frequently Abdominal mass Rarely Yes Perineal disease No Frequently Different clinical features UC Crohn’s disease Fistulas No Yes Small intestine No Frequently obstruction Colonic Rarely Frequently obstruction Response to No Yes antibiotic Recurrence after No Yes surgery Different endoscopic features UC Crohn’s disease Rectal sparing Rarely Frequently Continuous Yes Occasionally disease „cobblestoning” No Yes Granuloma on No Occasionally biopsy.
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