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炎症性肠病 I：引言
炎症性肠病是一组慢性疾病，其特征是由于对肠道微生物群的异常免疫反应，导致胃肠道反复发生炎症，从而引起组织损伤。该病主要有两种类型：克罗恩病和溃疡性结肠炎。
克罗恩病
克罗恩病是一种复发性炎症性疾病，可累及从口腔到肛门的消化道任何部位。该病累及肠壁的所有层次（透壁性），并表现为“跳跃性病变”，即病变区域与…
炎症性肠病是指胃肠道的反复炎症，由异常的免疫反应引起。
包括克罗恩病和溃疡性结肠炎。
克罗恩病可影响从口腔到肛门的胃肠道任何部位，并根据受累的具体区域进行分类。这些区域有时可能会重叠。
回结肠炎影响回肠末端和结肠。
回肠炎局限于回肠，而克罗恩结肠炎仅限于结肠。
胃十二指肠疾病涉及胃和十二指肠。
空肠回肠炎影响回肠和空肠，而肛周疾病则累及肛门周围组织。
溃疡性结肠炎是一种病因不明的结肠和直肠炎症性疾病，局限于黏膜和黏膜下层。
它通常起始于直肠，并以连续的方式向近端延伸至结肠，表现出多种不同的分布模式。
直肠炎仅累及直肠，而直肠乙状结肠炎则同时累及直肠和乙状结肠。
左侧结肠炎累及脾曲，而全结肠炎则累及整个结肠直至盲肠。
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Q1: What is inflammatory bowel disease and what causes it?
Inflammatory bowel disease refers to recurrent inflammation of the gastrointestinal tract resulting from an abnormal immune response against gut microflora. This chronic disorder leads to tissue damage and includes two main forms: Crohn's disease and ulcerative colitis. Both conditions cause inflammation but differ in location and depth of involvement within the GI tract.
Q2: How does Crohn's disease differ from ulcerative colitis in terms of affected areas?
Crohn's disease can affect any part of the GI tract from the mouth to the anus and involves all bowel wall layers with skip lesions where diseased areas alternate with normal tissue. Ulcerative colitis is limited to the colon and rectum, affecting only the mucosa and submucosa, and spreads continuously from the rectum without skip lesions.
Q3: What are the different types of Crohn's disease based on location?
Crohn's disease is classified by affected areas: ileocolitis involves the terminal ileum and colon; ileitis is confined to the ileum; Crohn's colitis affects the colon; gastroduodenal disease involves the stomach and duodenum; jejunoileitis affects the jejunum and ileum; and perianal disease involves tissues around the anus.
Q4: What are the extent patterns of ulcerative colitis?
Ulcerative colitis presents in distinct patterns: proctitis affects only the rectum; proctosigmoiditis involves the rectum and sigmoid colon; left-sided colitis extends to the splenic flexure; and pancolitis involves the entire colon. Each pattern reflects progressive inflammation spreading continuously from the rectum.
Q5: What are the main symptoms associated with ileocolitis?
Ileocolitis, the most common form of Crohn's disease affecting the terminal ileum and colon, causes diarrhea, cramping, weight loss, and right lower abdominal pain. These symptoms result from inflammation in both the small and large intestines, making it the most frequently diagnosed Crohn's subtype.
Q6: How does pancolitis differ from other ulcerative colitis patterns in severity?
Pancolitis involves the entire colon and produces more severe symptoms than localized patterns, including profuse diarrhea, abdominal pain, and significant weight loss. Pancolitis also carries an increased risk of colon cancer compared to other ulcerative colitis extent patterns, making it the most serious presentation.
Q7: What complications can develop from perianal Crohn's disease?
Perianal disease, a form of Crohn's disease affecting tissues around the anus, can develop abscesses, fistulas, fissures, and skin tags. These complications result from transmural inflammation extending through all bowel wall layers to surrounding tissues, causing significant morbidity and requiring specialized management.