Diverticulosis

Diverticulosis
Not to be confused with Diverticulitis.
Diverticulosis
Classification and external resources

Diverticulosis as seen endoscopically
ICD-10 K57
ICD-9 562.01
OMIM 223320
DiseasesDB 3871
eMedicine med/3102
MeSH D004240

Diverticulosis also known as "diverticular disease" is the condition of having diverticula in the colon, which are outpocketings of the colonic mucosa and submucosa through weaknesses of muscle layers in the colon wall. These are more common in the sigmoid colon, which is a common place for increased pressure. This is uncommon before the age of 40, and increases in incidence after that age.[1]

Contents

Signs and symptoms

Cramps and tenderness in the affected areas.

Most people with colonic diverticulosis are unaware of this structural change. When symptoms do appear in a person over 40 years of age it is important to obtain medical advice and exclude more dangerous conditions such as cancer of the colon or rectum.[2][3][4][5]

The clinical forms of colonic diverticulosis are

Symptomatic colonic diverticulosis

This is the most common complication of colonic diverticulosis. This is when the motility (that is, the onward propulsive nature of contractions) of the bowel becomes disorganized. Sometimes, spasm can develop. This results in pain in the left lower abdomen and often is accompanied by the passage of small pellet-like stools and slime which relieves the pain. Symptoms can consist of (1) bloating, (2) changes in bowel movements (diarrhea or constipation), (3) Non-specific chronic discomfort in the lower left abdomen, with occasional acute episodes of sharper pain, (4) abdominal pain, often in the left lower abdomen and/or after meals. If these persist clinical investigation is advised.

Complicated colonic diverticulosis

This is very uncommon but highly dangerous. The diverticula may bleed, either rapidly (causing bleeding through the rectum) or slowly (causing anaemia). The diverticula can become infected and develop abscesses, or even perforate. These are serious complications and medical care is needed. Infected diverticula and development of abscesses merits the term diverticulitis. First time bleeding from the rectum, especially in individuals aged over age 40, could be due to colon cancer, colonic polyps and inflammatory bowel disease rather than diverticulosis and requires clinical investigation.[6][7][8]

Risk factors

  1. increasing age
  2. constipation
  3. a diet that is low in dietary fiber content or high in fat
  4. high intake of meat and red meat
  5. connective tissue disorders (such as Marfan syndrome) that may cause weakness in the colon wall.

The exact aetiology of colonic diverticulosis has yet to be fully clarified and many of the claims are only anecdotal.[9][10] The modern emphasis on the value of fiber in the diet began with Cleave.[11] A strong case was made by Neil Painter[12] and Adam Smith [13] that a deficiency of dietary fiber is the cause of diverticular disease. They argued that the colonic muscles needed to contract strongly in order to transmit and expel the small stool associated with a fiber deficient diet. The increased pressure within the segmented section of bowel over years gave rise to herniation at the vulnerable point where blood vessels enter the colonic wall. Denis Burkitt had suggested that the mechanical properties of the colon may be different in the African and the European subjects. Because Africans eat a diet containing much more fiber than Europeans and use the natural squatting position for defecation, they pass bulky stools, and hence rarely if ever develop colonic diverticulosis.[14] The U.S. National Institutes of Health (NIH) considers the fiber theory "unproven."[15]

However, change in the strength of the colonic wall with age may be an aetiological factor.[16] Connective tissue is a significant contributor to the strength of the colonic wall. The mechanical properties of connective tissue depend on a wide variety of factors, the type of tissue and its age, the nature of the intramolecular and intermolecular covalent cross links and the quantity of the glycosaminoglycans associated with the collagen fibrils. The submucosa of the colon is composed almost entirely of collagen, both type I and type III. Several layers of collagen fibres make up the submucosa of the human colon. The collagen fibril diameters and fibril counts are different between the left and right colon and change with age and in colonic diverticulosis,.[17][18] The implication being that changes which are normally associated with ageing are more pronounced in colonic diverticulosis.[19] Iwasaki found that the tensile strength of the Japanese colon obtained at postmortem declined with age.[20] Similarly the mechanical properties of the colon are stronger in African than European subjects.[19] However, this race-based claim is contradicted by the virtually identical incidence of diverticular disease in black and white Americans.[21]

The strength of the colon decreases with age in all parts of the colon, except the ascending colon. The fall in tensile strength with age is due to a decrease in the integrity of connective tissue.[22] Cross linkage of collagen is increased in colonic diverticulosis. The mucosal layer is possibly more elastic and it is likely that the stiffer external layers break and allow the elastic mucosa to herniate through forming a diverticulum. Collagen has intermolecular and intramolecular cross links which stabilise and give strength to the tissue in which it is located. Accumulation of covalently linked sugar molecules and related increasing cross linking products are found in a variety of tissues with ageing, skin, vascular tissue, the cordae tendinae of heart valves and the colon.[23] This reduces the strength and pliability of the collagen. Colonic diverticulosis increases in frequency with age.[24] There is a reduction in the strength of the colonic mucosa with age, and that increased contractions in the descending and sigmoid colon secondary to an insufficient fibre content of the diet cause protrusion through this weakened wall. Colonic diverticulosis is in general a benign condition of the bowel which uncommonly becomes symptomatic and even less commonly becomes a truly clinical complicated problem.

Diagnosis

In cases of asymptomatic Diverticulosis, the diagnosis is usually made as an incidental finding on other investigations.

While a good history is often sufficient to form a diagnosis of Diverticulosis or Diverticulitis, it is important to confirm the diagnosis and rule out other pathology (notably colorectal cancer) and complications.

Investigations

  • Plain Abdominal X-ray may show signs of a thickened wall, ileus, constipation, small bowel obstruction or free air in the case of perforation. Plain X-rays are insufficient to diagnose Diverticular Disease.
  • Contrast CT is the investigation of choice in acute episodes of Diverticulitis and where complications exist.
  • Colonoscopy will show the diverticulum and rule out malignancy. A Colonoscopy should be performed 4–6 weeks after an acute episode.
  • Barium enema is inferior to colonoscopy in terms of image quality and is usually only performed if the patient has strictures or an excessively tortuous sigmoid colon where colonoscopy is difficult or dangerous.
  • MRI provides a clear picture of the soft tissue of the abdomen, however its expense often outweighs the benefits when compared to contrast CT or colonoscopy.
  • There is no blood test for Diverticulosis.

It is important to note that both Barium enema and Colonoscopy are contraindicated during acute episodes of diverticulitis, as the barium may leak out into the abdominal cavity, and colonoscopy can cause perforations of the bowel wall.

Management

Many patients with diverticulosis have minimal to no symptoms, and do not require any specific treatment. A high-fiber diet and fiber supplements are advisable to prevent constipation .[25] .[26] The American Dietetic Association recommends 20-35 grams each day. Wheat bran has much to commend it as this has been shown to reduce intra colonic pressure [27] [28] Ispaghula is also effective at 1-2 grams a day. Colonic stimulants should be avoided. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says foods such as nuts, popcorn hulls, sunflower seeds, pumpkin seeds, caraway seeds, and sesame seeds have traditionally been labeled as problem foods for people with this condition; however, no scientific data exists to prove this hypothesis. The seeds in tomatoes, zucchini, cucumbers, strawberries, raspberries, and poppy seeds, are not considered harmful by the NIDDK. Treatments, like some colon cleansers, that cause hard stools, constipation, and straining, are not recommended. Some doctors also recommend avoidance of fried foods, nuts, corn, and seeds to prevent complications of diverticulosis. Whether these diet restrictions are beneficial is uncertain; recent studies have stated that nuts and popcorn do not contribute positively or negatively to patients with diverticulosis or diverticular complications.[29][30] When the spasm pain is troublesome the use of peppermint oil (1 drop in 50 ml water), or peppermint tablets (e.g., colpermin), can be helpful. Complicated diverticulosis requires treatment of the complication. These complications are often grouped under a single diagnosis of diverticulitis and require skilled medical care of the infection, bleeding and perforation which may include intensive antibiotic treatment, intravenous fluids and surgery. Complications are more common in patients who are taking NSAIDS or aspirin. As diverticulosis occurs in an older population such complications are serious events.

Complications

Infection of a diverticulum can result in diverticulitis. This occurs in 10%-25% of people with diverticulosis (NIDDK website). Tears in the colon leading to bleeding or perforations may occur; intestinal obstruction may occur (constipation or diarrhea does not rule this possibility out); and peritonitis, abscess formation, retroperitoneal fibrosis, sepsis, and fistula formation are also possible occurrences. Rarely, an enterolith may form.

Low fiber, high fat diet, constipation and use of stimulant laxatives increase the risk of bleeding, also history of diverticulitis increases the chance to bleed.

Infection of a diverticulum often occurs as a result of stool collecting in a diverticulum.

More than 10% of the U.S. population over the age of 40 and 50% over the age of 60 has diverticulosis. This disease is common in the U.S., Britain, Australia, Canada, and is uncommon in Asia and Africa.[1][31] Large-mouth diverticula are associated with scleroderma.

References

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Look at other dictionaries:

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  • diverticulosis — [dī΄vər tik΄yo͞olō′sis] n. [see OSIS] the abnormal condition of having a number of diverticula protruding from the wall of the intestinal tract …   English World dictionary

  • diverticulosis — ► sustantivo femenino MEDICINA Presencia de numerosos divertículos en alguna cavidad del cuerpo: ■ la diverticulosis es muy frecuente en el sistema digestivo. IRREG. plural diverticulosis …   Enciclopedia Universal

  • diverticulosis — {{＃}}{{LM D44374}}{{〓}} {{［}}diverticulosis{{］}} ‹di·ver·ti·cu·lo·sis› {{◆}}(pl. diverticulosis){{◇}} {{《}}▍ s.f.{{》}} Inflamación de los divertículos …   Diccionario de uso del español actual con sinónimos y antónimos

  • diverticulosis simple — diverticulosis en la que no hay trastornos demostrables de la motilidad colónica ni hipertrofia de las capas musculares, y su patogenia es desconocida Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010 …   Diccionario médico

  • diverticulosis espástica — se caracteriza por hipertrofia muscular relacionada con espasmo de la musculatura colónica y aumento de las presiones intraluminales. Usualmente va acompañada de dolor y estreñimiento Diccionario ilustrado de Términos Médicos.. Alvaro Galiano.… …   Diccionario médico

  • Diverticulosis/diverticulitis and fiber — High fiber diets help delay the progression of diverticulosis and, at least, reduce the bouts of …   Medical dictionary

  • diverticulosis — noun Etymology: New Latin Date: 1917 an intestinal disorder characterized by the presence of many diverticula …   New Collegiate Dictionary

  • diverticulosis — /duy veuhr tik yeuh loh sis/, n. Pathol. the presence of saclike herniations of the mucosal layer of the colon through the muscular wall, common among older persons and usually producing no symptoms except occasional rectal bleeding. [1915 20;… …   Universalium

  • diverticulosis — noun The condition of having diverticula, or small pouches, formed along the mucosa of the colon …   Wiktionary

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