A volvulus is when a loop of

intestine The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organs of the digestive system, in humans ...

twists around itself and the

mesentery The mesentery is an organ that attaches the intestines to the posterior abdominal wall in humans and is formed by the double fold of peritoneum. It helps in storing fat and allowing blood vessels, lymphatics, and nerves to supply the intestines ...

that supports it, resulting in a

bowel obstruction Bowel obstruction, also known as intestinal obstruction, is a mechanical or Ileus, functional obstruction of the Gastrointestinal tract#Lower gastrointestinal tract, intestines which prevents the normal movement of the products of digestion. Eith ...

. Symptoms include abdominal pain,

abdominal bloating Abdominal bloating (or simply bloating) is a short-term disease that affects the gastrointestinal tract. Bloating is generally characterized by an excess buildup of gas, air or fluids in the stomach. A person may have feelings of tightness, press ...

, vomiting, constipation, and

bloody stool Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically origi ...

. Onset of symptoms may be rapid or more gradual. The mesentery may become so tightly twisted that blood flow to part of the intestine is cut off, resulting in

ischemic bowel Ischemic bowel may refer to: *Ischemic colitis, ischemia of the large bowel *Mesenteric ischemia Intestinal ischemia is a medical condition in which injury to the large or small intestine occurs due to not enough blood supply. It can come on sud ...

. In this situation there may be fever or significant pain when the abdomen is touched. Risk factors include a birth defect known as intestinal malrotation, an enlarged colon, Hirschsprung disease, pregnancy, and

abdominal adhesion Adhesions are fibrous bands that form between tissues and organs, often as a result of injury during surgery. They may be thought of as internal scar tissue that connects tissues not normally connected. Pathophysiology Adhesions form as a natural ...

s. Long term constipation and a

high fiber diet Dietary fiber (in British English fibre) or roughage is the portion of plant-derived food that cannot be completely broken down by human digestive enzymes. Dietary fibers are diverse in chemical composition, and can be grouped generally by the ...

may also increase the risk. The most commonly affected part of the intestines in adults is the

sigmoid colon The sigmoid colon (or pelvic colon) is the part of the large intestine that is closest to the rectum and anus. It forms a loop that averages about in length. The loop is typically shaped like a Greek letter sigma (ς) or Latin letter S (thus ''s ...

with the cecum being second most affected. In children the

small intestine The small intestine or small bowel is an organ in the gastrointestinal tract where most of the absorption of nutrients from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the p ...

is more often involved. The stomach can also be affected. Diagnosis is typically with

medical imaging Medical imaging is the technique and process of imaging the interior of a body for clinical analysis and medical intervention, as well as visual representation of the function of some organs or tissues (physiology). Medical imaging seeks to rev ...

such as

plain X-ray Projectional radiography, also known as conventional radiography, is a form of radiography and medical imaging that produces two-dimensional images by X-ray, x-ray radiation. The image acquisition is generally performed by radiographers, and the i ...

s, a GI series, or

CT scan A computed tomography scan (CT scan; formerly called computed axial tomography scan or CAT scan) is a medical imaging technique used to obtain detailed internal images of the body. The personnel that perform CT scans are called radiographers ...

. Initial treatment for sigmoid volvulus may occasionally occur via sigmoidoscopy or with a barium enema. Due to the high risk of recurrence, a

bowel resection A bowel resection or enterectomy ('' enter-'' + '' -ectomy'') is a surgical procedure in which a part of an intestine (bowel) is removed, from either the small intestine or large intestine. Often the word ''enterectomy'' is reserved for the sense ...

within the next two days is generally recommended. If the bowel is severely twisted or the blood supply is cut off, immediate surgery is required. In a cecal volvulus, often part of the bowel needs to be surgically removed. If the cecum is still healthy, it may occasionally be returned to a normal position and sutured in place. Cases of volvulus were described in ancient Egypt as early as 1550 BC. It occurs most frequently in Africa, the Middle East, and India. Rates of volvulus in the United States are about 2–3 per 100,000 people per year. Sigmoid and cecal volvulus typically occurs between the ages of 30 and 70. Outcomes are related to whether or not the bowel tissue has died. The term volvulus is from the Latin "volvere"; which means "to roll".

Signs and symptoms

Regardless of cause, volvulus causes symptoms by two mechanisms: * Bowel obstruction manifested as abdominal distension and bilious vomiting. * Ischemia (loss of blood flow) to the affected portion of intestine. Depending on the location of the volvulus, symptoms may vary. For example, in patients with cecal volvulus, the predominant symptoms may be those of small bowel obstruction (nausea, vomiting and lack of stool or flatus), because the obstructing point is close to the ileocecal valve and small intestine. In patients with sigmoid volvulus, although abdominal pain may be present, symptoms of constipation may be more prominent. Volvulus causes severe pain and progressive injury to the intestinal wall, with accumulation of gas and fluid in the portion of the bowel obstructed. Ultimately, this can result in

necrosis Necrosis () is a form of cell injury which results in the premature death of cells in living tissue by autolysis. Necrosis is caused by factors external to the cell or tissue, such as infection, or trauma which result in the unregulated dige ...

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. Acute volvulus often requires immediate surgical intervention to untwist the affected segment of bowel and possibly resect any unsalvageable portion. Volvulus occurs most frequently in middle-aged and elderly men. Volvulus can also arise as a rare complication in persons with redundant colon, a normal anatomic variation resulting in extra colonic loops. Sigmoid volvulus is the most-common form of volvulus of the gastrointestinal tract. and is responsible for 8% of all intestinal obstructions. Sigmoid volvulus is particularly common in elderly persons and constipated patients. Patients experience abdominal pain, distension, and absolute constipation. Cecal volvulus is slightly less common than sigmoid volvulus and is associated with symptoms of abdominal pain and small bowel obstruction. Volvulus can also occur in patients with Duchenne muscular dystrophy due to smooth muscle dysfunction. Gastric volvulus causes nausea, vomiting, and pain in the upper abdomen. The Borchardt triad is a group of symptoms that help doctors to identify gastric volvulus. The symptoms are intractable retching, pain in the upper abdomen and inability to pass nasogastric tube into the stomach.

Complications

* Strangulation *

Gangrene Gangrene is a type of tissue death caused by a lack of blood supply. Symptoms may include a change in skin color to red or black, numbness, swelling, pain, skin breakdown, and coolness. The feet and hands are most commonly affected. If the ga ...

* Perforation * Faecal peritonitis * Recurrent volvulus

Causes

Midgut volvulus occurs in people (usually babies) that are predisposed because of congenital intestinal malrotation. Segmental volvulus occurs in people of any age, usually with a predisposition because of abnormal intestinal contents (e.g. meconium ileus) or adhesions. Volvulus of the cecum, transverse colon, or

occurs, usually in adults, with only minor predisposing factors such as redundant (excess, inadequately supported) intestinal tissue and constipation.

Types

* volvulus neonatorum * volvulus of the small intestine * midgut volvulus (due to intestinal malrotation) * volvulus of the caecum ( cecum), also cecal volvulus *

sigmoid colon volvulus Sigmoid colon volvulus, also known as sigmoid volvulus, is volvulus affecting the sigmoid colon. It is a common cause of bowel obstruction and constipation. It is common in Asia, India (7% of intestinal obstruction) and especially South India becau ...

(sigmoid volvulus) * volvulus of the transverse colon * volvulus of the splenic flexure, the rarest * gastric volvulus *

ileosigmoid knot An ileosigmoid knot is a form of volvulus in which ileum wraps around the base of the sigmoid Sigmoid means resembling the lower-case Greek letter sigma (uppercase Σ, lowercase σ, lowercase in word-final position ς) or the Latin letter S. Spec ...

Diagnosis

After taking a thorough history, the diagnosis of colonic volvulus is usually easily included in the differential diagnosis. Abdominal plain x-rays are commonly confirmatory for a volvulus, especially if a "bent inner tube" sign or a "coffee bean" sign are seen. These refer to the shape of the air-filled closed loop of colon which forms the volvulus. Should the diagnosis be in doubt, a barium enema may be used to demonstrate a "bird's beak" at the point where the segment of proximal bowel and distal bowel rotate to form the volvulus. This area shows an acute and sharp tapering and looks like a bird's beak. If a perforation is suspected, barium should not be used due to its potentially lethal effects when distributed throughout the free intraperitoneal cavity.

Gastrografin Diatrizoate, also known as amidotrizoate, is a contrast agent used during X-ray imaging. This includes visualizing veins, the urinary system, spleen, and joints, as well as computer tomography (CT scan). It is given by mouth, injection into a vei ...

, which is safer, can be substituted for barium. The differential diagnosis includes the much more common constricting or obstructing carcinoma. In approximately 80 percent of colonic obstructions, invasive carcinoma is found to be the cause of the obstruction. This is usually easily diagnosed with endoscopic biopsies.

Diverticulitis Diverticulitis, specifically colonic diverticulitis, is a gastrointestinal disease characterized by inflammation of abnormal pouches—diverticula—which can develop in the wall of the large intestine. Symptoms typically include lower abdominal ...

is a common condition with different presentations. Although diverticulitis may be the source of a colonic obstruction, it more commonly causes an ileus, which appears to be a colonic obstruction. Endoscopic means can be used to secure a diagnosis although this may cause a perforation of the inflamed diverticular area. CT scanning is the more common method to diagnose diverticulitis. The scan will show mesenteric stranding in the involved segment of edematous colon which is usually in the sigmoid region. Micro perforations with free air may be seen. Ulcerative colitis or

Crohn's disease Crohn's disease is a type of inflammatory bowel disease (IBD) that may affect any segment of the gastrointestinal tract. Symptoms often include abdominal pain, diarrhea (which may be bloody if inflammation is severe), fever, abdominal distension ...

may cause colonic obstruction. The obstruction may be acute or chronic after years of uncontrolled disease leads to the formation of strictures and fistulas. The medical history is helpful in that most cases of inflammatory bowel disease are well known to both patient and doctor. Other rare syndromes, including

Ogilvie's syndrome Ogilvie syndrome is the acute dilatation of the colon in the absence of any Bowel obstruction, mechanical obstruction in severely ill patients. Acute Intestinal pseudo-obstruction, colonic pseudo-obstruction is characterized by massive dilatation ...

, chronic constipation and impaction may cause a pseudo obstruction. * Abdominal x-ray – tire-like shadow arising from right iliac fossa and passing to left *

Upper GI series An upper gastrointestinal series, also called a barium swallow, barium study, or barium meal, is a series of radiographs used to examine the gastrointestinal tract for abnormalities. A contrast medium, usually a radiocontrast agent such as bari ...

File:Sigmavolvulus - Coffee-bean-sign - LSL.jpg, Coffee bean sign in a person with sigmoid volvulus File:Sigmavolvulus - 91w - CT cor - 001 - Annotation.gif, Coronal view of sigmoid volvulus with "whirlpool sign" File:CT of small bowel volvulus (annotated).jpg,

of a small bowel volvulus. It shows two juxtaposed segments of narrowing, which is the spot of mesentery rotation. The other signs indicate strangulation. File:Voluculus.PNG, An x-ray of a person with a small bowel volvulus. File:CecalVolvulusXray.png, Plain X ray of a cecal volvulus File:CecalVolvulus.png, CT scan of a cecal volvulus

Treatment

Sigmoid

Treatment for sigmoid volvulus may include sigmoidoscopy. If the mucosa of the sigmoid looks normal and pink, a rectal tube for decompression may be placed, and any fluid, electrolyte, cardiac, kidney or pulmonary abnormalities should be corrected. The affected person should then be taken to the operating room for surgical repair. If surgery is not performed, there is a high rate of recurrence. For people with signs of sepsis or an abdominal catastrophe, immediate surgery and resection are advised.

Cecal

In a cecal volvulus, the cecum may be returned to a normal position and sutured in place, a procedure known as cecopexy. If identified early, before presumed intestinal wall ischemia has resulted in tissue breakdown and necrosis, the cecal volvulus can be detorsed laparoscopically. It has been associated to several diseases, including Huntington's disease.

Other

Laparotomy for other forms of volvulus, especially anal volvulus.

References

External links

CT of an abdomen with sigmoid volvulus
{{Gastroenterology Diseases of intestines Abdominal pain Wikipedia medicine articles ready to translate Wikipedia emergency medicine articles ready to translate