Ibs Irritable Bowel Basics

Ibs Irritable Bowel Basics

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o Patients with postinfectious irritable bowel syndrome may have increased numbers of colonic mucosal lymphocytes and enteroendocrine cells. o Current theories integrate these widespread motility aberrations and hypothesize a generalized smooth muscle hyperresponsiveness. ibs-irritable-bowel-basics * Microscopic inflammation has been documented in some patients.Irritable bowel syndrome (IBS) is a functional GI disorder characterized by abdominal pain and altered bowel habits in the absence of specific and unique organic pathology. ibs-irritable-bowel-basics Notably, within 1 year, 75% of patients change subtypes, and 29% switch between constipation-predominant IBS and diarrhea-predominant IBS.

* Small bowel bacterial overgrowth has been heralded as a unifying mechanism for the symptoms of bloating and distention common to patients with irritable bowel syndrome. ibs-irritable-bowel-basics The Manning criteria to distinguish irritable bowel syndrome from organic disease are as follows: * Onset of pain associated with looser bowel movements * Pain relieved by defecation * Visible abdominal bloating * Subjective sensation of incomplete evacuation more than 25% of the time More recently, a consensus panel created and then updated the Rome criteria to provide a standardized diagnosis for research and clinical practice. o Enteroendocrine cells in postinfectious irritable bowel syndrome appear to secrete high levels of serotonin, increasing colonic secretion and possibly leading to diarrhea. ibs-irritable-bowel-basics o Enhanced perception of normal motility and visceral pain characterizes irritable bowel syndrome. o An Axis I disorder coincides with the onset of GI symptoms in as many as 77% of patients.

ibs-irritable-bowel-basics .2 FrequencyUnited States Population-based studies estimate the prevalence of irritable bowel syndrome at 1-2% per year. ibs-irritable-bowel-basics The Rome III criteria (2006) for the diagnosis of irritable bowel syndrome require that patients must have recurrent abdominal pain or discomfort at least 3 days per month during the previous 3 months that is associated with 2 or more of the following: * Relieved by defecation * Onset associated with a change in stool form or appearance Supporting symptoms include the following: * Altered stool frequency * Altered stool form * Altered stool passage (straining and/or urgency) * Mucorrhea * Abdominal bloating or subjective distention Four bowel patterns may be seen with irritable bowel syndrome. Rectosigmoid and small bowel balloon inflation produces pain at lower volumes in patients than in controls. ibs-irritable-bowel-basics o Whether psychopathology incites development of irritable bowel.

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