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Irritable bowel syndrome synonymous with GILL/HT/IB
Classification and external resources
ICD-10 K58.
ICD-9 564.1
DiseasesDB 30638
MedlinePlus 000246
eMedicine med/1190 
MeSH D043183

Irritable bowel syndrome (IBS) is a blanket term for a variety of diseases causing discomfort in the gastro-intestinal tract. It is also called spastic colon, is a functional bowel disorder characterized by chronic abdominal pain, discomfort, bloating, and alteration of bowel habits in the absence of any organic cause. In some cases, the symptoms are relieved by bowel movements.[1] Diarrhea or constipation may predominate, or they may alternate (classified as IBS-D, IBS-C or IBS-A, respectively). IBS may begin after an infection (post-infectious, IBS-PI) or a stressful life event or may begin at onset of maturity without any other medical indicators.

Although there is no cure for IBS, there are treatments which attempt to relieve symptoms, including dietary adjustments, medication and psychological interventions. Patient education and a good doctor-patient relationship are also important.[1]

Several conditions may present as IBS including celiac disease, mild infections, parasitic infections like giardiasis[2], several inflammatory bowel diseases, functional chronic constipation, and chronic functional abdominal pain. In IBS, routine clinical tests yield no abnormalities, though the bowels may be more sensitive to certain stimuli, such as balloon insufflation testing. The exact cause of IBS is unknown. The most common theory is that IBS is a disorder of the interaction between the brain and the gastrointestinal tract, although there may also be abnormalities in the gut flora or the immune system.[3][4]

IBS does not lead to more serious conditions in most patients.[5][6][7][8][9] But it is a source of chronic pain, fatigue and other symptoms, and it increases a patient's medical costs,[10][11] and contributes to work absenteeism.[12][13] Researchers have reported that the high prevalence of IBS,[14][15][16] in conjunction with increased costs produces a disease with a high societal cost.[17] It is also regarded as a chronic illness and can dramatically affect the quality of a sufferer's life.

Contents

Classification

IBS can be classified as either diarrhea-predominant (IBS-D), constipation-predominant (IBS-C) or IBS with alternating stool pattern (IBS-A or pain-predominant[18]). In some individuals, IBS may have an acute onset and develop after an infectious illness characterized by two or more of the following: fever, vomiting, diarrhea, or positive stool culture. This post-infective syndrome has consequently been termed "post-infectious IBS" (IBS-PI).

Symptoms

The primary symptoms of IBS are abdominal pain or discomfort in association with frequent diarrhea or constipation, a change in bowel habits.[19] There may also be urgency for bowel movements, a feeling of incomplete evacuation (tenesmus), bloating or abdominal distention.[20] People with IBS more commonly than others have gastroesophageal reflux, symptoms relating to the genitourinary system, psychological symptoms, fibromyalgia, chronic fatigue syndrome, headache and backache.[20][21]

Diagnosis

There is no specific laboratory or imaging test which can be performed to diagnose irritable bowel syndrome.[22] Diagnosis of IBS involves excluding conditions which produce IBS-like symptoms, and then following a procedure to categorize the patient's symptoms.

Differential diagnosis

Because there are many causes of diarrhea that give IBS-like symptoms, the American Gastroenterological Association has published a set of guidelines for tests to be performed to rule out other causes for these symptoms. These include gastrointestinal infections, lactose intolerance and Coeliac disease. Research has suggested that these guidelines are not always followed.[22] Once other causes have been excluded, the diagnosis of IBS is performed using a diagnostic algorithm. Well-known algorithms include the Manning Criteria, the obsolete Rome I and II criteria, the Kruis Criteria, and studies have compared their reliability.[23] The more recent Rome III Process was published in 2006. Physicians may choose to use one of these guidelines, or may simply choose to rely on their own anecdotal experience with past patients. The algorithm may include additional tests to guard against mis-diagnosis of other diseases as IBS. Such "red flag" symptoms may include weight loss, GI bleeding, anemia, or nocturnal symptoms. However, researchers have noted that red flag conditions may not always contribute to accuracy in diagnosis — for instance, as many as 31% of IBS patients have blood in their stool.[23]

The diagnostic algorithm identifies a name which can be applied to the patient's condition based on the combination of the patient's symptoms of diarrhea, abdominal pain, and constipation. For example, the statement "50% of returning travelers had developed functional diarrhea while 25% had developed IBS" would mean that half the travelers had diarrhea while a quarter had diarrhea with abdominal pain. While some researchers believe this categorization system will help physicians understand IBS, others have questioned the value of the system and suggested that all IBS patients have the same underlying disease but with different symptoms.[24]

Misdiagnosis

Published research has demonstrated that some poor patient outcomes are due to treatable causes of diarrhea being mis-diagnosed as IBS. Common examples include infectious diseases, celiac disease,[25] helicobacter pylori,[26][27] parasites.[4][28][29] See List of causes of diarrhea for other conditions which can cause diarrhea.

Celiac disease in particular is often misdiagnosed as IBS. The American College of Gastroenterology recommends that all patients with symptoms of IBS be tested for celiac disease.[30] Chronic use of certain sedative-hypnotic drugs especially the benzodiazepines may cause irritable bowel like symptoms which can lead to a misdiagnosis of irritable bowel syndrome.[31]

Medical conditions that accompany IBS

Researchers have identified several medical conditions, or comorbidities, which appear with greater frequency in patients diagnosed with IBS.

Headache, Fibromyalgia, Chronic fatigue syndrome and Depression: A study of 97,593 individuals with IBS identified comorbidities as headache, fibromyalgia, and depression.[32] A systematic review found that IBS occurs in 51% of chronic fatigue syndrome patients and 49% of fibromyalgia patients, and psychiatric disorders were found to occur in 94% of IBS patients.[21]
Inflammatory bowel disease: Some researchers have suggested that IBS is a type of low-grade inflammatory bowel disease.[5] Researchers have suggested that IBS and IBD are interrelated diseases,[6] noting that patients with IBD experience IBS-like symptoms when their IBD is in remission.[7][8] A 3-year study found that patients diagnosed with IBS were 16.3 times more likely to develop IBD during the study period.[9] Serum markers associated with inflammation have also been found in patients with IBS (see Causes).
Abdominal surgery: A recent (2008) study found that IBS patients are at increased risk of having unnecessary cholecystectomy (gall bladder removal surgery) not due to an increased risk of gallstones, but rather to abdominal pain, awareness of having gallstones, and inappropriate surgical indications.[33] A 2005 study published in Digestive Disease Science reported that IBS patients are 87% more likely to undergo abdominal and pelvic surgery, and three times more likely to undergo gallbladder surgery.[34] A study published in Gastroenterology came to similar conclusions, and also noted IBS patients were twice as likely to undergo hysterectomy.[35]
Endometriosis: One study has reported a statistically significant link between migraine headaches, IBS, and endometriosis.[36]
Other chronic disorders: Interstitial cystitis may be associated with other chronic pain syndromes, such as irritable bowel syndrome and fibromyalgia. The connection between these syndromes is unknown.[37]

Etiology

Initially, IBS was considered a psychosomatic illness and the involvement of biological and pathogenic factors was not verified until the 1990s, a process common in the history of emerging infectious diseases.[citation needed] The risk of developing IBS increases sixfold after acute gastrointestinal infection. Post-infection, further risk factors are young age, prolonged fever, anxiety and depression.[38] Anecdotal evidence has also pointed to long doses of antibiotics as being a possible factor in developing IBS. It is believed the antibiotics may destroy the body's natural bacteria which can lead to IBS, although this has yet to be proven scientifically. [39]

Psychosomatic illness

Publications suggesting the role of brain-gut "axis" appeared in the 1990s, such as a study entitled Brain-gut response to stress and cholinergic stimulation in IBS published in the Journal of Clinical Gastroenterology in 1993.[40] A 1997 study published in Gut magazine suggested that IBS was associated with a "derailing of the brain-gut axis."[41] Psychological factors are still thought to be important in the etiology of IBS.[21]

Immune reaction

From the late 1990s, research publications began identifying specific biochemical changes present in tissue biopsies and serum samples from IBS patients. These studies identified cytokines and secretory products in tissues taken from IBS patients. The cytokines identified in IBS patients produce inflammation and are associated with the body's immune response.

Active infections

There is research to support IBS being caused by an as-yet undiscovered active infection. Most recently, a study has found that the antibiotic Rifaximin provides sustained relief for IBS patients.[42] While some researchers see this as evidence that IBS is related to an undiscovered agent, others believe IBS patients suffer from overgrowth of intestinal flora and the antibiotics are effective in reducing the overgrowth (known as small intestinal bacterial overgrowth).[43] Other researchers have focused on an unrecognized protozoal infection as a cause of IBS[4] as certain protozoal infections occur more frequently in IBS patients.[44][45] Two of the protozoa investigated have a high prevalence in industrialized countries and infect the bowel, but little is known about them as they are recently emerged pathogens.

Blastocystis is a single-celled organism which has been reported to produce symptoms of abdominal pain, constipation and diarrhea in patients, along with headaches and depression,[46] though these reports are contested by some physicians.[47] Studies from research hospitals in various countries have identified high Blastocystis infection rates in IBS patients, with 38% being reported from London School of Hygiene & Tropical Medicine,[48] 47% reported from the Department of Gastroenterology at Aga Khan University in Pakistan[44] and 18.1% reported from the Institute of Diseases and Public Health at University of Ancona in Italy.[45] Reports from all three groups indicate a Blastocystis prevalence of approximately 7% in non-IBS patients. Researchers have noted that clinical diagnostics fail to identify infection,[49] and Blastocystis may not respond to treatment with common antiprotozoals.[50][51][52][53]

Further information: Blastocystosis

Dientamoeba fragilis is a single-celled organism which produces abdominal pain and diarrhea. Studies have reported a high incidence of infection in developed countries, and symptoms of patients resolve following antibiotic treatment.[54][55] One study reported on a large group of patients with IBS-like symptoms who were found to be infected with Dientamoeba fragilis, and experienced resolution of symptoms following treatment.[56] Researchers have noted that methods used clinically may fail to detect some Dientamoeba fragilis infections.[55] It is also found in people without IBS. [57]

Further information: Dientamoeba fragilis

Treatment

A questionnaire in 2006 designed to identify patients’ perceptions about IBS, their preferences on the type of information they need, as well as educational media and expectations from health care providers, revealed misperceptions about IBS developing into other conditions, including colitis, malnutrition, and cancer.[58]

The survey found IBS patients were most interested in learning about foods to avoid (60%), causes of IBS (55%), medications (58%), coping strategies (56%), and psychological factors related to IBS (55%). The respondents indicated that they wanted their physicians to be available via phone or e-mail following a visit (80%), have the ability to listen (80%), and provide hope (73%) and support (63%).

Diet

Many different dietary modifications have been attempted to improve the symptoms of IBS. Some are effective in certain sub populations. As lactose intolerance and IBS have such similar symptoms a trial of a lactose free diet is often recommended.[59] Fiber supplements have not been found to be effective in the general IBS population.[60] They however might be beneficial in those who have a predominance of constipation.

Definitive determination of dietary issues can be accomplished by testing for the physiological effects of specific foods. The ELISA food allergy panel can identify specific foods to which a patient has a reaction. Other testing can determine if there are nutritional deficiencies secondary to diet that may also play a role. Removal of foods causing IgG immune response as measured using the ELISA food panel has been shown to substantially decrease symptoms of IBS in several studies.[61]

There is no evidence that digestion of food or absorption of nutrients is problematic for those with IBS at rates different from those without IBS. However, the very act of eating or drinking can provoke an overreaction of the gastrocolic response in some patients with IBS due to their heightened visceral sensitivity, and this can lead to abdominal pain, diarrhea, and/or constipation.[62]

Several of the most common dietary triggers are well-established by clinical studies at this point; research has shown that IBS patients are hypersensitive to fats and fructose.[63][64]

It also appears that some foods are more difficult for the gut as evidenced by elevated food-specific IgG4 antibodies being present,[65][66] while others increase colonic contractions, which may be painful, due to increased visceral sensitivity in IBS sufferers.[67]

Fiber

In patients who have constipation predominant irritable bowel, soluble fiber at doses of 20 grams per day can reduce overall symptoms but will not reduce pain. The research supporting dietary fiber contains conflicting, small studies that are complicated by the heterogeneity of types of fiber and doses used.[68] The one meta-analysis that controlled for solubility found that only soluble fiber improved global symptoms of irritable bowel and neither type of fiber reduced pain[68] Positive studies have used 20-30 grams per day of psyllium seed.[69][70] One study specifically examined the effect of dose and found that 20 grams of ispaghula husk was better than 10 grams and equivalent to 30 grams per day[71] An uncontrolled study noted increased symptoms with insoluble fibers.[72] It is unclear if these symptoms are truly increased compared to a control group. If the symptoms are increased, it is unclear if these patients were diarrhea predominant (which can be exacerbated by insoluble fiber[73][74]), or if the increase is temporary before benefit occurs.

Medication

Medications may consist of stool softeners and laxatives in constipation-predominant IBS, and antidiarrheals (e.g., opiate, opioid or opioid analogs such as loperamide, codeine, diphenoxylate) in diarrhea-predominant IBS for mild symptoms.[75][76][77]

Drugs affecting serotonin (5-HT) in the intestines can help reduce symptoms.[78] Serotonin stimulates the gut motility and so agonists can help constipation-predominate irritable bowel, while antagonists can help diarrhea-predominant irritable bowel.

Laxatives

Main article: Laxative

For patients who do not adequately respond to dietary fiber, osmotic agents such as polyethylene glycol, sorbitol, and lactulose can help avoid 'cathartic colon' which has been associated with stimulant laxatives.[79] Among the osmotic laxatives, 17 to 26 grams/day of polyethylene glycol (PEG) has been well studied.

  • Lubiprostone (Amitiza), is a gastrointestinal agent used for the treatment of idiopathic chronic constipation and constipation-predominant IBS. It is well-tolerated in adults, including elderly patients. As of July 20, 2006, Lubiprostone had not been studied in pediatric patients. Lubiprostone is a bicyclic fatty acid (prostaglandin E1 derivative) which acts by specifically activating ClC-2 chloride channels on the apical aspect of gastrointestinal epithelial cells, producing a chloride-rich fluid secretion. These secretions soften the stool, increase motility, and promote spontaneous bowel movements (SBM). Unlike many laxative products, Lubiprostone does not show signs of tolerance, dependency, or altered serum electrolyte concentration.

Antispasmodics

Main article: Antispasmodic

The use of antispasmodic drugs (e.g. anticholinergics such as hyoscyamine or dicyclomine) may help patients, especially those with cramps or diarrhea. A meta-analysis by the Cochrane Collaboration concludes that if 6 patients are treated with antispasmodics, 1 patient will benefit.[75] Antispasmodics can be divided in two groups: neurotropics and musculotropics. Neurotropics, such as atropine, act at the nerve fibre of the parasympathicus but also affect other nerves and have side effects. Musculotropics such as mebeverine act directly at the smooth muscle of the gastrointestinal tract, relieving spasm without affecting normal gut motility.[citation needed] Since this action is not mediated by the autonomic nervous system, the usual anticholinergic side effects are absent.[citation needed]

Serotonin agonists

  • Tegaserod (Zelnorm), a selective 5-HT4 agonist for IBS-C, is available for relieving IBS constipation in women and chronic idiopathic constipation in men and women. On March 30, 2007, the Food and Drug Administration (FDA) requested that Novartis Pharmaceuticals voluntarily discontinue marketing of tegaserod based on the recently identified finding of an increased risk of serious cardiovascular adverse events (heart problems) associated with use of the drug. Novartis agreed to voluntarily suspend marketing of the drug in the United States and in many other countries. On July 27, 2007 the Food and Drug Administration (FDA) approved a limited treatment IND program for tegaserod in the USA to allow restricted access to the medication for patients in need if no comparable alternative drug or therapy is available to treat the disease. The USA FDA had issued two previous warnings about the serious consequences of Tegaserod. In 2005, tegaserod was rejected as an IBS medication by the European Union. Tegaserod, marketed as Zelnorm in the United States, was the only agent approved to treat the multiple symptoms of IBS (in women only), including constipation, abdominal pain and bloating. A meta-analysis by the Cochrane Collaboration concludes that if 17 patients are treated with typical doses of tegaserod, 1 patient will benefit.[80]
  • Selective serotonin reuptake inhibitor anti-depressants (SSRIs), because of their serotonergic effect, would seem to help IBS, especially patients who are constipation predominant. Initial crossover studies[81] and randomized controlled trials[82][83][84] support this role.

Serotonin antagonists

  • Alosetron, a selective 5-HT3 antagonist for IBS-D, which is only available for women in the United States under a restricted access program, due to severe risks of side-effects if taken mistakenly by IBS-A or IBS-C sufferers.[citation needed]
  • Cilansetron, also a selective 5-HT3 antagonist, is undergoing further clinical studies in Europe for IBS-D sufferers. In 2005, Solvay Pharmaceuticals withdrew Cilansetron from the United States regulatory approval process after receiving a "not approvable" action letter from the FDA requesting additional clinical trials.[citation needed]

Other agents

There is conflicting evidence about the benefit of antidepressants in IBS. Some meta-analysis have found a benefit while others have not.[85] A meta-analysis of randomized controlled trials of mainly TCAs found 3 patients have to be treated with TCAs for one patient to improve.[86] A separate randomized controlled trial found that TCAs are best for patients with diarrhea-predominant IBS.[87]

Recent studies have suggested that rifaximin can be used as an effective treatment for abdominal bloating and flatulence,[42][88] giving more credibility to the potential role of bacterial overgrowth in some patients with IBS.[89]

The use of opioids is controversial due to the lack of evidence supporting their benefit and the potential risk of tolerance, physical dependence and addiction.[90]

Psychotherapy

There is a strong brain-gut component to IBS. Cognitive behavioral therapy has been found to improve symptoms in a number of studies.[91][92] Relaxation therapy has also been found to helpful.[93]

Alternative treatments

Probiotics

A 2008 review has found probiotics to be beneficial in the treatment of IBS.[94] Many different type have be found to be effective including: Lactobacillus plantarum[95] and Bifidobacteria infantis;[96] however, one review found that only Bifidobacteria infantis showed efficacy.[97]

Iberogast

The multi-herbal extract Iberogast was found to be significantly superior to placebo via both an abdominal pain scale and an IBS symptom score after four weeks of treatment.[98]

Peppermint oil

Enteric coated peppermint oil capsules has been advocated for IBS symptoms in adults and children;[99] however, results from trials have been inconsistent.[100][101]

Acupuncture

Many sufferers of IBS seek relief using acupuncture.[citation needed] A meta-analysis by the Cochrane Collaboration however concluded that most trials are of poor quality and that it is unknown whether acupuncture is more effective than placebo.[102]

Epidemiology

By Country: Studies have reported that the prevalence of IBS varies by country and by age range examined. The bar graph at right shows the percentage of the population reporting symptoms of IBS in studies from various geographic regions (see table below for references).

The following table contains a list of studies performed in different countries that measured the prevalence of IBS and IBS-like symptoms:

Percentage of Population Reporting Symptoms of IBS in Various Studies from Various Geographic Areas ** Check the Rome criteria studies (eg, at PubMed) and see how the reported prevalence rates drop! Also, one should be wary of trusting many of these study results - ref. 'Havidol'.
Country Prevalence Author/Year Notes
Canada 6%[14] Boivin,2001
Japan 10%[103] Quigley,2006 Study measured prevalence of GI abdominal pain/cramping
United Kingdom 8.2%[104]

10.5%[15]

Ehlin,2003

Wilson,2004

Prevalence increased substantially 1970-2004
United States 14.1%[105] Hungin, 2005 Most undiagnosed
United States 15%[14] Boivin,2001 Estimate
Pakistan 14%[106] Jafri, 2007 Much more common in 16-30 age range. Of IBS patients, 56% male, 44% female
Pakistan 34%[107] Jafri,2005 College students
Mexico City 35%[16] Schmulson, 2006 n=324. Also measured functional diarrhea and functional vomiting. High rates attributed to "stress of living in a populated city."
Brazil 43%[103] Quigley,2006 Study measured prevalence of GI abdominal pain/cramping
Mexico 46%[103] Quigley,2006 Study measured prevalence of GI abdominal pain/cramping

Returning Travelers: A study of United States residents returning from international travel found a high rate of IBS and persistent diarrhea which developed during travel and persisted upon return. The study examined 83 subjects in Utah, most of whom were returning missionaries. Of the 68 who completed the gastrointestinal questionnaire, 27 reported persistent diarrhea that developed while traveling, and 10 reported persistent IBS that developed while traveling.[108]

Economic cost of IBS

The aggregate cost of irritable bowel syndrome in the United States has been estimated at $1.7-$10 billion in direct medical costs, with an additional $20 billion in indirect costs, for a total of $21.7-$30 billion.[17] A study by a managed care company comparing medical costs of IBS patients to non-IBS controls identified a 49% annual increase in medical costs associated with a diagnosis of IBS.[11] A 2007 study from a managed care oganization found that IBS patients incurred average annual direct costs of $5,049 and $406 in out-of-pocket expenses.[10] A study of workers with IBS found that they reported a 34.6% loss in productivity, corresponding to 13.8 hours lost per 40 hour week.[12] A study of employer-related health costs from a Fortune 100 company conducted with data from the 1990s found IBS patients incurred US $4527 in claims costs vs. $3276 for controls.[109] A study on Medicaid costs conducted in 2003 by the University of Georgia's College of Pharmacy and Novartis found IBS was associated in an increase of $962 in Medicaid costs in California, and $2191 in North Carolina. IBS patients had higher costs for physician visits, outpatients visits, and prescription drugs. The study suggested the costs associated with IBS were comparable to those found in asthma patients.[110]

Research spending on IBS

Further information: NIH funding of IBS Research

The National Institutes of Health provides a searchable database for grant awards since 1974 on its CRISP database, and provides dollar amounts for recent awards on its Intramural Grant Award Page. In 2006, the NIH awarded approximately 56 grants related to IBS, totalling approximately $18.7 million.

History

One of the first references to the concept of an "irritable bowel" appeared in the Rocky Mountain Medical Journal in 1950.[111] The term was used to categorize patients who developed symptoms of diarrhea, abdominal pain, constipation, but where no well-recognized infective cause could be found. Early theories suggested that the Irritable Bowel was caused by a psychosomatic, or mental disorder.

See also

References

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External links

Retrieved from "http://yak.rapint.com/wiki/Irritable_bowel_syndrome"

Wiktionary

Up to date as of January 14, 2010

Definition from Wiktionary, a free dictionary

Contents

English

Noun

Singular
irritable bowel syndrome

Plural
uncountable

irritable bowel syndrome (uncountable)

  1. (pathology) A functional disorder causing the nerves and muscles of the large intestine to be oversensitive, leading to symptoms such as cramp, bloating, flatulence, diarrhoea and constipation.

Translations

irritable bowel syndrome
  • French: côlon irritable m.
  • German: Reizdarmsyndrom
  • Polish: zespół jelita drażliwego m.
  • Spanish: síndrome del intestino irritable m.

Abbreviation

See also








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