Effects of Rifaximin on Visceral Hypersensitivity in Irritable Bowel Syndrome
试验速览
- 阶段
- 2 期
- 状态
- 终止
- 入组人数
- 4
- 试验地点
- 1
- 主要终点
- Mean Change in the Balloon Volume (Measured in Cubic Centimeter) That Leads to First Urge to Defecate.
研究概览
简要总结
Irritable bowel syndrome (IBS) is one of the most common gastrointestinal disorders, with a global prevalence of 11% according to a recent meta-analysis. The total cost of managing IBS in the United States is in excess of $30 billion per year, including indirect costs relating to loss of productivity of more than $20 billion. Abdominal pain/discomfort (i.e. visceral hypersensitivity) is present in all patients with IBS and remains the most therapy-resistant symptom. Apart from abdominal pain, which is measured subjectively using visual scales, several studies have shown a significant increase in rectal sensitivity, which is measured objectively using an inflatable balloon. Drugs which are shown to have objective effects on visceral hypersensitivity are crucial in the management of IBS.
While certain drugs have shown to decrease abdominal pain, there is very little data to substantiate objective changes in visceral hypersensitivity. Rifaximin is a poorly absorbed antibiotic and the exact underlying mechanism of action for rifaximin in reducing the pain component of IBS remains unknown. However, rifaximin has been shown in randomized controlled trials to decrease abdominal discomfort in all subtypes of IBS.
The investigators hypothesize that rifaximin is effective in decreasing rectal visceral hypersensitivity in IBS patients. In this study, the investigators propose to test this hypothesis by measuring visceral hypersensitivity using the graded balloon distention test, before and after a course of rifaximin. To test whether this effect is accompanied by treating SIBO, the investigators will also perform lactulose breath tests before and after rifaximin therapy.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 75 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Male or female subjects aged 18-75 years old inclusive
- •Meet Rome IV criteria for IBS-D or IBS-M
- •Subjects should report urgency with bowel movement at least once a week
- •If subjects are ≥50 years old, a colonoscopy must have been completed within the past 5 years
- •Subjects are capable of understanding the requirements of the study, are willing to comply with all the study procedures, and are willing to attend all study visits.
- •Agree to use an acceptable method of contraception throughout their participation in the study. Acceptable methods of contraception include: double barrier methods (condom with spermicidal jelly or a diaphragm with spermicide); hormonal methods (e. g. oral contraceptives, patches or medroxyprogesterone acetate); or an intrauterine device (IUD) with a documented failure rate of less than 1% per year. Abstinence or partner(s) with a vasectomy may be considered an acceptable method of contraception at the discretion of the investigator.
- •All subjects will provide Institutional Review Board (IRB)-approved informed written consent prior to beginning any study-related activities
- •NOTE: Female subjects who have been surgically sterilized (e.g. hysterectomy or bilateral tubal ligation) or who are postmenopausal (total cessation of menses for >1 year) will not be considered "females of childbearing potential".
排除标准
- •Treatment with antibiotics or Xifaxan in the last two months
- •Subjects with history of intestinal surgery (except appendectomy or cholecystectomy)
- •Subjects with known pelvic floor dysfunction
- •Pregnancy
- •Nursing mothers
- •Poorly controlled/uncontrolled significant medical condition that would interfere with study procedures
- •History of bowel obstruction
- •History of celiac disease
- •History of inflammatory bowel disease
- •Cirrhosis
- •IBS-C/chronic idiopathic constipation
- •History of anorectal radiation/surgery
- •History of prostatitis
- •Known allergy or hypersensitivity to rifaximin or rifamycin
- •Current treatment with eluxadoline or opiates
- •NOTE: Development of any of the exclusion criteria during the study will be considered a basis for subject discontinuation.
研究组 & 干预措施
Therapeutic
40 subjects with diarrhea-predominant IBS (IBS-D) or mixed IBS (IBS-M) will be enrolled in the study. At the first clinic visit, subjects will undergo rectal sensitivity testing, as well as lactulose breath testing. Subjects will be asked to record their symptoms and bowel habits in a diary over the next 7 days. During the second clinic visit, subjects will receive a 14-day course of rifaximin (550 mg PO TID). During these 14 days, subjects will record their symptoms and bowel habits. Subjects will return to the clinic after completion of the medication and will undergo repeat evaluation via rectal sensitivity testing to assess for change in rectal sensitivity.
干预措施: Rifaximin (Drug)
结局指标
主要结局
Mean Change in the Balloon Volume (Measured in Cubic Centimeter) That Leads to First Urge to Defecate.
时间窗: After completing 14-day course of rifaximin.
A 100-cubic centimeter visual analogue scale with verbal descriptors (0=no sensation, 20=first sensation, 40=first sense of urge, 60=normal urge to defecate, 80=severe urge to defecate, and 100=discomfort/pain) will be used to score evoked sensations.
次要结局
- Number of Participants With a Rise of Hydrogen <20 Parts Per Million Within 90 Minutes of Lactulose Ingestion.(Which is Considered Normal )(After completing 14-day course of rifaximin)
- Association of Urgency Symptom and Rectal Sensitivity Testing.(After completing 14-day course of rifaximin.)
研究者
Nipaporn Pichetshote
Staff Physician
Cedars-Sinai Medical Center