Manipulation of the rate of gastrointestinal transit by modulating intestinal methane concertration

Inactive Publication Date: 2006-11-02
CEDARS SINAI MEDICAL CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention relates to a method of manipulating the rate of gastrointestinal transit in a mammalian subject, including a human patient. The method involves: (a) increasing the rate of gastrointestinal transit by causing the par

Problems solved by technology

However, there is no finding that can be identified in a majority of patients and by extension, there is no diagnostic test that is associated with IBS.
The main issue with culture is accessibility.
Riordan, et al. compared breath testing to direct culture and found the breath test to lack reliability (29).
As such, direct culture is only practical in the patient

Method used

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  • Manipulation of the rate of gastrointestinal transit by modulating intestinal methane concertration
  • Manipulation of the rate of gastrointestinal transit by modulating intestinal methane concertration
  • Manipulation of the rate of gastrointestinal transit by modulating intestinal methane concertration

Examples

Experimental program
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Effect test

example 1

Methane Excretion on Breath Test has a Positive Predictive Value of 100% for Constipation-Predominant IBS

[0044] In a double-blind, randomized, placebo-controlled study, we confirm that an abnormal lactulose breath test is more prevalent in IBS than normal controls, and that antibiotic treatment in IBS leads to an improvement in symptoms and that this is based on antibiotic-induced normalization of breath test. Secondly, lactulose breath test profiles are evaluated to show that gaseous constituents vary among IBS subgroups. In this study, we show that methane excretion on breath test has a positive predictive value of 100% for constipation predominant IBS. This is another important step in linking SIBO and IBS.

A. Materials and Methods

Study Population

[0045] Study subjects were recruited by advertising in local newspapers, radio and IBS support groups throughout the greater Los Angeles are& To avoid referral bias, subjects were not recruited through the GI motility clinic or any ...

example 2

Administration of Methane to the Distal Gut Slows Gastrointestinal Transit

[0075] We now show that methane administered directly to the distal gut produces a slowing of gastrointestinal transit. In dogs equipped with duodenal (10 cm from pylorus) and mid-gut (160 cm from pylorus) fistulas, intestinal transit was compared across an isolated 150 cm test segment (between fistulas) while the proximal segment of the gut was perfused with pH 7.0 phosphate buffer at 2 mL / min for 90 minutes. Room air (n=three dogs) or methane (n=three dogs) was delivered into the distal gut as a 180-ml bolus at time 0. Sixty minutes after the start of the perfusion, 20 μCi of 99 mTc-DTPA (diethylenetriaminepentaacetic acid) was delivered as a bolus into the proximal segment of the gut. Intestinal transit was then measured by counting the radioactivity of 1 ml samples collected every 5 minutes from the diverted output of the mid-gut fistula.

[0076] Intestinal transit was calculated by determining the area un...

example 3

[0078] The following study confirmed and further investigated the relationship between gastrointestinal complaints (specifically, diarrhea and constipation) in IBS-diagnosed subjects with SIBO and gas excretion on LBT in a large prospectively collected database. The prevalence of gas excretion patterns in IBS and the predominantly diarrheal conditions of Crohn's disease and ulcerative colitis were also compared.

A. Materials and Methods.

Patient Population

[0079] Consecutive patients referred for a lactulose breath test (LBT) to the Cedars-Sinai Medical Center, GI Motility Program from 1998-2000 completed a questionnaire designed to assess bowel symptoms as previously described (12) after approval from the institutional review board. Subjects were requested to rate the severity of nine symptoms (diarrhea, constipation, abdominal pain, bloating, sense of incomplete evacuation, straining, urgency, mucus, and gas) on a scale of 0-5, 0 signifying the absence of the symptom. The questi...

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Abstract

Disclosed is a method of manipulating the rate of gastrointestinal transit in a mammalian subject Also disclosed is the use, in the manufacture of a medicamens for the treatment of constipation, of a selective inhibitor of methanogensis, a methanogen-displacing probiotic agent, or a prebiotic agent that inhibits the growth of methanogenic bacteria or promotes the growth of competing non-methanogenic intestinal flora. Alternatively, in accordance with the invention, is disclosed the use in the manufacture of a medicament for the treatment of diarrhea, of methane, or a methane precursor, a methanogenic or other methane-enhancing probiotic agent, or a methanogenesis-enhancing prebiotic agent.

Description

BACKGROUND OF THE INVENTION Discussion of the Related Art [0001] Irritable bowel syndrome (IBS) is a common gastrointestinal disorder seen in more than 15% of the population (1,2). [0002] Over the last few years, progress has been made in characterizing irritable bowel syndrome (IBS). Studies have demonstrated altered gut motility (3), peripheral (4) and central (5) sensory dysfunction, as well as an exaggerated response to stress (6) in this syndrome. However, there is no finding that can be identified in a majority of patients and by extension, there is no diagnostic test that is associated with IBS. As a result, investigators have created complex diagnostic schema such as the Rome criteria to help diagnose and categorize the syndrome (7,8). [0003] One consistent clinical finding in IBS is gas in combination with bloating and visible distention (9,10). Koide et al. recently found small intestinal gas to be significantly increased in IBS compared to controls (11) regardless of whet...

Claims

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Application Information

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IPC IPC(8): A61K35/74A61K31/405A61K31/351A61K45/00A61K31/74A61K35/745A61K35/747A61P1/00A61P1/10A61P1/12C12N1/00C12N1/12C12N1/20
CPCA61K31/01A61K31/405A61K31/74A61K31/351A61K35/747A61K36/064C12N1/20A61K35/745A61K9/0053A61K31/7036A61P1/00A61P1/10A61P1/12
Inventor PIMENTEL, MARKLIN, HENRY C.
Owner CEDARS SINAI MEDICAL CENT
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