NUR 555 Module 6 Comparison Paper Example

Deep and Patchy or Shallow and Continuous: Crohn Disease and Ulcerative Colitis Compared

[Student Name]

Southern New Hampshire University

NUR 555: Advanced Clinical Pathophysiology

Comparison Paper

[Instructor Name]

[Date]

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Deep and Patchy or Shallow and Continuous: Crohn Disease and Ulcerative Colitis Compared

Crohn disease and ulcerative colitis are both chronic inflammatory bowel diseases, both relapsing and remitting and both thought to arise when a genetically susceptible immune system responds abnormally to the bacteria that normally live in the gut. They are often discussed together, but they differ in ways that change almost every clinical decision. This paper argues that two features, the depth of inflammation and its distribution along the gut, separate the diseases and explain their different symptoms, complications, biopsy findings and responses to surgery: Crohn disease is transmural and patchy anywhere from mouth to anus, while ulcerative colitis is confined to the mucosa and spreads continuously upward from the rectum.

Two Patients

Patient I, a 24-year-old man who smokes a pack a day, has had four months of cramping pain in the right lower abdomen, loose but non-bloody stools, a 6 kg weight loss and a painful, draining opening beside the anus. Colonoscopy shows patchy deep ulcers in the last part of the small intestine, the terminal ileum, separated by normal-looking bowel, with a cobblestone appearance; biopsies show inflammation extending deep into the wall and non-caseating granulomas.

Patient J, a 33-year-old woman who quit smoking six months ago, has had six weeks of diarrhea with blood and mucus up to eight times a day, urgency and a constant feeling of needing to empty the bowel. Colonoscopy shows continuous inflammation with loss of the normal vessel pattern and small ulcers from the rectum up through the sigmoid colon, then normal bowel above; biopsies show inflammation limited to the mucosa, with crypt abscesses and no granulomas.

A Shared Starting Point

Both diseases begin at the barrier between the gut lining and its bacteria. In susceptible people, genetic variants affecting bacterial sensing, barrier function and immune regulation, together with environmental factors, lead to a loss of tolerance to gut microbes. Innate immune cells in the lining respond with cytokines, and adaptive T cell responses amplify and sustain the inflammation (Torres et al., 2017; Ungaro et al., 2017). Tumor necrosis factor is central in both diseases, which is why drugs that block it can treat either. The differences lie in where and how deeply the inflammation takes hold.

Both diseases also reach beyond the gut. Inflammatory arthritis, inflamed eyes, skin lesions and, in ulcerative colitis especially, primary sclerosing cholangitis can accompany either condition, reflecting immune activity that is not confined to the bowel (Rogers, 2023). Both patients should therefore be asked about joint pain, red or painful eyes and skin changes, and both need their blood counts, iron and inflammatory markers followed, since chronic inflammation and blood loss can each cause anemia.

Crohn Disease: Deep and Patchy

In Crohn disease, inflammation reaches every layer of the intestinal wall, and it can affect any part of the gastrointestinal tract, most often the terminal ileum and colon, in separate segments with normal bowel between them, the so-called skip lesions (Torres et al., 2017). Granulomas, organized collections of immune cells, appear in many biopsies and help confirm the diagnosis. Crohn disease is associated with T cell responses dominated by interleukin-12 and interleukin-23 signaling.

Transmural inflammation explains Patient I's complications. Inflammation through the wall can create tracts to neighboring structures, fistulas, like the draining opening beside his anus, and healing through fibrosis can narrow the bowel into strictures that cause cramping pain. Inflammation of the terminal ileum, where vitamin B12 and bile acids are absorbed, explains the location of his pain and puts him at risk of B12 deficiency. Smoking, which Patient I does, increases the risk of Crohn disease and worsens its course.

Ulcerative Colitis: Shallow and Continuous

In ulcerative colitis, inflammation is confined to the mucosa, the lining of the colon, and it begins in the rectum and extends upward continuously, without skip lesions, for a variable distance (Ungaro et al., 2017). Neutrophils collect in the crypts of the lining, forming crypt abscesses, and the inflamed, ulcerated surface bleeds easily.

These features explain Patient J's symptoms. Inflamed rectal mucosa produces urgency and tenesmus, the persistent sense of incomplete emptying, and the friable surface produces blood and mucus in the stool. Because the inflammation stays in the lining, fistulas and strictures are uncommon. Interestingly, current smokers have a lower risk of ulcerative colitis, and the disease often appears or flares after a person stops smoking, as it did for Patient J (Ungaro et al., 2017), the reverse of the pattern in Crohn disease.

Features That Separate Them

The contrasts that matter at the bedside and under the microscope are gathered in Table 1.

Table 1

Crohn Disease and Ulcerative Colitis Compared

Why the Difference Matters for Treatment

The distinction changes management. Aminosalicylates such as mesalamine, which act on the surface of the colon, are a mainstay for mild to moderate ulcerative colitis but have little role in Crohn disease. Because ulcerative colitis is confined to the colon, removing the colon cures the bowel disease, whereas in Crohn disease surgery removes damaged segments but the disease can return elsewhere, so bowel-sparing approaches are preferred. Smoking cessation is one of the most effective interventions for Crohn disease, while quitting may unmask ulcerative colitis, which should never be a reason to keep smoking but helps explain Patient J's timing. Anti-TNF and other biologic therapies are used in moderate to severe disease of both types (Torres et al., 2017; Ungaro et al., 2017).

Conclusion

Both patients have inflammatory bowel disease, but Patient I's inflammation runs through the full thickness of scattered segments of the ileum, forming granulomas, a fistula and cramping pain, while Patient J's inflammation coats the lining continuously from the rectum up, causing bloody diarrhea and urgency. Depth and distribution, confirmed by endoscopy and biopsy, separate the diseases, and they explain why aminosalicylates, surgery and even smoking affect the two so differently.

References

Rogers, J. L. (Ed.). (2023). McCance & Huether's pathophysiology: The biologic basis for disease in adults and children (9th ed.). Elsevier.

Torres, J., Mehandru, S., Colombel, J.-F., & Peyrin-Biroulet, L. (2017). Crohn's disease. The Lancet, 389(10080), 1741-1755. https://doi.org/10.1016/S0140-6736(16)31711-1

Ungaro, R., Mehandru, S., Allen, P. B., Peyrin-Biroulet, L., & Colombel, J.-F. (2017). Ulcerative colitis. The Lancet, 389(10080), 1756-1770. https://doi.org/10.1016/S0140-6736(16)32126-2