Collagenous and Lymphocytic Colitis Clinical Presentation
- Author: Eric Goosenberg, MD; Chief Editor: Julian Katz, MD more...
History
- A protracted course of nonbloody diarrhea occurs. Diarrhea may be of high volume; some patients may eliminate more than 1500 mL of fluid per day.
- Symptoms may have been present from several months to 2-3 years before medical attention is sought and a diagnosis is made. In fact, perhaps half of patients proven to have microscopic colitis meet the Rome, Rome II, and Manning symptom-based criteria for diarrhea-predominant irritable bowel syndrome and may be so misdiagnosed until endoscopic biopsies of the colon are taken.
- Less frequent complaints include abdominal cramping, fecal incontinence, and weight loss, although weight loss may be seen in 40% or more of patients with CC.
- Incontinence is probably more a reflection of the advanced age of those individuals who are affected, and patients with this problem may do well if treated with antidiarrheal agents.
Physical
- Physical examination usually does not reflect specific abnormalities.
- Severely affected individuals may show signs of dehydration, malnutrition, and weight loss.
Causes
No definite etiology has been determined, but evidence now indicates that drug consumption may trigger underlying inflammatory factors in the colons of affected individuals, while others may exacerbate the diarrhea in patients with idiopathic microscopic colitis. While many drugs, either alone or in combination, may cause diarrhea as an adverse effect, nonsteroidal anti-inflammatory drugs (NSAIDs) show a strong trend (p=0.057) toward increasing the risk of CC, with rechallenge having been shown to cause recurrence of CC. Antidepressant selective serotonin reuptake inhibitors (SSRIs) as a group increase the risk of CC, but, among this class of medications, sertraline alone significantly increases the risk of LC. Anecdotal reports of of a large number of additional drugs have been associated with the onset of the microscopic colitides. Among these, ranitidine (confirmed by rechallenge), aspirin, acarbose, ticlopidine, and proton pump inhibitors have high-level evidenceofcausality,whileflutamide, simvastatin, carbamazepine and lisinopril have intermediate-level evidence.
- Some patients have had histologic findings consistent with both CC and LC at different points during the course of disease. This raises the possibility that these may be different manifestations of the same medical condition or different points along a continuum.
- Many case reports describe patients with preexisting presumed autoimmune conditions, such as celiac sprue, psoriasis and rheumatoid arthritis, who subsequently are diagnosed with microscopic colitis. Patients diagnosed with LC also have had uveitis, idiopathic pulmonary fibrosis, juvenile diabetes mellitus, pernicious anemia, autoimmune thyroid disease, and idiopathic thrombocytopenic purpura. Approximately 1/3 of patients with celiac disease have histologic findings consistent with microscopic colitis. For this reason microscopic colitis should be considered in patients diagnosed with celiac disease who have diarrhea that fails to respond to a gluten-free diet. Removal of gluten from the diet, however, is ineffective in treating microscopic colitis in the absence of celiac disease.
- Microscopic colitis and inflammatory bowel disease (Crohn's disease or ulcerative colitis) have been diagnosed concurrently or sequentially in a small number of cases, with either diagnosis preceding the other. The two conditions may have similar histologic features, making the distinction between them difficult.
- LC was diagnosed in a patient who failed to respond to antibiotic therapy for diarrhea associated with Campylobacter jejuni infection in the stool. The infection theoretically might have stimulated an autoimmune response that resulted in LC.
- Increased mast cells in some LC patients might indicate that degranulation products could serve as a chemoattractant for inflammatory cells.
- While only 14% of patients with LC were smoking actively when diagnosed, 23% were former smokers, suggesting that smoking may actually be protective against the development of LC. Excessive production of nitric oxide by inducible nitric oxide synthase (iNOS) may result in cytotoxicity through the generation of peroxynitrite that is formed when nitric oxide reacts with superoxide. Corticosteroids inhibit iNOS biosynthesis in some cells, and newer inhibitors of this enzyme may have a future role in the management of LC and other forms of colitis. Nitric oxide diffuses into cells and can induce inflammatory cell damage by causing nitration reactions. Increased nitric oxide generation has been reported in CC. The absence of nitrotyrosine staining, which is an indicator of active inflammation typically seen in ulcerative colitis, may correspond to the lesser degree of inflammation in CC compared with ulcerative colitis.[4]
- Diarrhea associated with CC has been proven to be due to reduced net Na+ and Cl- absorption, with the thickened collagen layer serving as a diffusion barrier. The epithelium nearly completely loses its ability to absorb these ions. In fact, the shift in net chloride flux is to secretion rather than absorption.
- Secretion of vascular endothelial growth factor, a fibrosis-enhancing peptide, is noted to be increased by the mucosa in some patients with CC. This may play a part in the pathogenesis.
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