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Toxic megacolon in a patient with ulcerative colitis: The patient subsequently underwent a colectomy. A pathological specimen showing toxic megacolon. The pathological process involves inflammation and damage to the colonic wall with unknown toxins breaking down the protective mucosal barrier and exposing the muscularis propria. [4]
Toxic megacolon is mainly seen in ulcerative colitis and pseudomembranous colitis, two chronic inflammations of the colon (and occasionally, in the other type of inflammatory bowel disease, Crohn's disease). Its mechanism is incompletely understood.
Overall, imaging tests, such as x-ray or CT scan, may be helpful in assessing for complications of ulcerative colitis, such as perforation or toxic megacolon. Bowel ultrasound (US) is a cost-effective, well-tolerated, non-invasive and readily available tool for the management of patients with inflammatory bowel disease (IBD), including UC, in ...
The total removal of the colon, called a colectomy or resection of affected parts of the colon may be needed if part of the gut dies (for instance toxic megacolon), or if there is a localized area of dysmotility. Gastric and colonic pacemakers have been tried. These are strips placed along the colon or stomach which create an electric discharge ...
Ogilvie syndrome, or acute colonic pseudo-obstruction, is the acute dilatation of the colon in the absence of any mechanical obstruction in severely ill patients. [1]Acute colonic pseudo-obstruction is characterized by massive dilatation of the cecum (diameter > 10 cm) and right colon on abdominal X-ray.
The signs and symptoms of colitis are quite variable and dependent on the cause of the given colitis and factors that modify its course and severity. [2]Common symptoms of colitis may include: mild to severe abdominal pains and tenderness (depending on the stage of the disease), persistent hemorrhagic diarrhea with pus either present or absent in the stools, fecal incontinence, flatulence ...
It may occur in chronic obstruction of stool transit, as in megacolon [10] and chronic constipation. Some diseases, such as Chagas disease , Hirschsprung's disease and others damage the autonomic nervous system in the colon's mucosa ( Auerbach's plexus ) and may cause extremely large or "giant" fecalomas, which must be surgically removed ...
Toxin B (TcdB) is a cytotoxin that has a molecular weight of 270 kDa and an isoelectric point, pl, of 4.1. [4] Toxin B has four different structural domains: catalytic, cysteine protease, translocation, and receptor binding. [5]