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Bowel obstruction, also known as intestinal obstruction, is a mechanical or functional obstruction of the intestines which prevents the normal movement of the products of digestion. [2] [5] Either the small bowel or large bowel may be affected. [1] Signs and symptoms include abdominal pain, vomiting, bloating and not passing gas. [1]
Wherever possible, this article generally follows the definitions and terminology of the 2018 consensus statement, [note 2] wherein ODS is defined as "a subset of functional constipation in which patients report symptoms of incomplete rectal emptying with or without an actual reduction in the number of bowel movements per week."
Volvulus causes severe pain and progressive injury to the intestinal wall, with accumulation of gas and fluid in the portion of the bowel obstructed. [11] Ultimately, this can result in necrosis of the affected intestinal wall, acidosis, and death. This is known as a closed-loop obstruction because there exists an isolated ("closed") loop of bowel.
On CT imaging, the small bowel feces sign appears as a mottled, mixed-density pattern within a distended small bowel loop. It is typically located proximal to the site of obstruction and is often accompanied by other features of small bowel obstruction, such as: [5] Dilated bowel loops: Loops proximal to the obstruction exhibit dilation (>2.5-3 ...
Symptoms include abdominal pain which may come and go, vomiting, abdominal bloating, and bloody stool. [1] It often results in a small bowel obstruction. [1] Other complications may include peritonitis or bowel perforation. [1] The cause in children is typically unknown; in adults a lead point is sometimes present. [1]
However, instances with symptoms and signs of a bowel obstruction occur, but with the absence of a mechanical obstruction, mainly in acute colonic pseudo-obstruction, Ogilvie's syndrome. [3] In 2023 the US FDA reported gastrointestinal ileus as an adverse effect of the medication semaglutide , with frequency and causal relationship unknown.
Signs and symptoms of DIOS include a sudden onset of crampy abdominal pain, vomiting, and a palpable mass (often in the right lower quadrant) in the abdomen. The characteristic abdominal pain is typically located in the center or right lower quadrant of the abdomen. [ 1 ]
Bowel obstruction is most often caused by intestinal adhesions, which frequently form after abdominal surgeries, or by chronic infections such as diverticulitis, hepatitis, and inflammatory bowel disease. The condition may be difficult to diagnose, as the symptoms may resemble those of other bowel disorders. [5]