Antibiotic Therapy in Small Intestinal Bacterial Overgrowth: Rifaximin Versus Metronidazole

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Antibiotic Therapy in Small Intestinal Bacterial Overgrowth: Rifaximin Versus Metronidazole European Review for Medical and Pharmacological Sciences 2009; 13: 111-116 Antibiotic therapy in small intestinal bacterial overgrowth: rifaximin versus metronidazole E.C. LAURITANO, M. GABRIELLI, E. SCARPELLINI, V. OJETTI, D. ROCCARINA, A. VILLITA, F. FIORE, R. FLORE, A. SANTOLIQUIDO, P. TONDI, G. GASBARRINI, G. GHIRLANDA, A. GASBARRINI Internal Medicine Department, Catholic University of the Sacred Heart, Rome (Italy) Abstract. – Background and Objectives: Few controlled trials on antibiotic therapy for GBT: glucose breath test small intestinal bacterial overgrowth are avail- H2: hydrogen able at present. Aim of the study was to assess IBS: irritable bowel syndrome efficacy, safety and tolerability of rifaximin with respect to metronidazole for the treatment of small intestinal bacterial overgrowth. Material and Methods: We enrolled 142 con- secutive patients with diagnosis of small intesti- Introduction nal bacterial overgrowth. Diagnosis of small in- testinal bacterial overgrowth based on the clini- Small intestinal bacterial overgrowth (SIBO) is cal history and the positivity of glucose breath a common clinical syndrome due to an increased test. Patients were randomised to two 7-day level of bacteria exceeding the presence of more treatment groups: rifaximin 1200 mg/day and than 105 CFU/mL of intestinal aspirate or of metronidazole 750 mg/day. Glucose breath test colonic-type species within the small bowel1,2. was reassessed 1 month after. Compliance and side-effect incidence were also evaluated. SIBO symptoms could be many and variably Results: One drop-out was observed in rifax- associated; abdominal pain or discomfort, bloat- imin group. Five drops-out occurred in metron- ing, diarrhoea and/or signs of malabsorption are idazole group. The glucose breath test normal- the most common1,2. Recent findings suggest that ization rate was significantly higher in the rifax- SIBO is highly prevalent in patients with IBS and imin with respect to the metronidazole group that SIBO decontamination is associated to a sig- (63.4% versus 43.7%; p<0.05; OR 1.50, 95% CI nificant improvement of IBS symptoms3-5. 1.14-4.38). The overall prevalence of adverse events was significantly lower in rifaximin with The culture of jejunal aspirates, regarded by respect to metronidazole group. many as the gold standard for the SIBO diagno- Discussion: Rifaximin showed an higher SIBO sis, has several limitations such as the potential decontamination rate than metronidazole at the for contamination by oropharyngeal bacteria dur- tested doses, both with a significant gain in ing intubation, and the fact that SIBO may be terms of tolerability. Either the present study or patchy and thus missed by a single aspiration. In recent evidencies suggest that rifaximin repre- sents a good choice for the management of pa- addition, it is too much invasive, expensive and tients affected by SIBO. difficult and too little reproducible to be pro- posed as a routine diagnostic test for SIBO in the Key Words: clinical practice, especially for patients with non- Bacterial overgrowth, Glucose breath test, Rifax- specific symptoms or those requiring repeated 1,2 imin, Metronidazole. testing . The GBT is considered a simple tool for SIBO diagnosis, since it is non invasive, highly repro- ducible and inexpensive when compared to the culture of jejunal aspirates. In addition, the speci- Abbreviatons ficity and the sensitivity of GBT are acceptable for screening studies (77-100% and 67-98% re- 6-8 SIBO: small intestinal bacterial overgrowth spectively) . The H2 produced in the human CFU: colony-forming unit body after glucose ingestion derives entirely Corresponding Author: Antonio Gasbarrini, MD; e-mail: [email protected] 111 E.C. Lauritano, M. Gabrielli, E. Scarpellini, V. Ojetti, D. Roccarina, A. Villita, et al. from intestinal bacterial fermentation. The ap- Major organic gastrointestinal disorders were pearance of an early increase in breath H2 con- ruled out on the basis of: history collection; full centration suggests the presence of SIBO6-8. physical examination; laboratory tests (total An effective antibiotic decontamination regi- blood count, erythrocyte sedimentation rate, re- men should include one or more drugs with ac- active C protein, stool examination for occult tivity against both aerobic and anaerobic bacte- blood, ova and parasites, anti-transglutaminase ria since SIBO may occur either by a mix of aer- antibodies); abdominal ultrasonography and obic and anaerobic flora or by purely aerobic colonoscopy when alarm symptoms were present flora in a minority of cases1,2,9-11. Empirical (fever, gastrointestinal bleeding, weight loss, courses of broad-spectrum antibiotics are widely anemia, abdominal mass). used at present for SIBO decontamination, since The Rome II criteria were used to verify the few well-conducted trials have been performed diagnosis of IBS or other functional bowel disor- up today to verify which is the best antibiotic ders19. regimen1,2,11,12. The exclusion criteria were: previous antibiot- Metronidazole is effective against Gram-nega- ic treatment associated to SIBO diagnosis; age tive and Gram-positive anaerobic bacteria such <18 years; use of antimicrobial agents within the as Bacterioides, Fusobacterium and Peptostrep- previous 3 months; hypersensitivity to the antibi- tococci13. These characteristics make it potential- otics used in the present study; pregnancy or ly useful for the treatment of small bowel bacter- breast-feeding; evidence of major concomitant ial overgrowth as confirmed by literature data14. diseases (including tumours and hepatic and/or Rifaximin is a rifamycin derivative with an- renal insufficiency). tibacterial activity caused by inhibition of bacter- Exclusion criteria were: age <18 years; hyper- ial synthesis of RNA15. It is active against gram- sensitivity to the antibiotics; pregnancy or breast- positive and gram-negative bacteria, including feeding; evidence of major concomitant diseases both aerobes and anaerobes15-17. Less than 0.1% (including tumours and hepatic and/or renal in- of the oral dose is absorbed16. Rifaximin at a sufficiency). Consecutive patients with positive dosage of 1200 mg per day for 1 week is associ- GBT were included in the present study after in- ated to a significant gain in terms of therapeutic formed consent. efficacy in SIBO contamination without increas- The procedures followed were in accordance ing the incidence of side-effects with respect to with with the Helsinki Declaration of the World lower dosages (600 and 800 mg per day for the Medical Association. same treatment period)18. The aim of the present study was to assess the Laboratory Parameters efficacy, safety and tolerability of the non-ab- Total blood cell count, liver and kidney func- sorbable antibiotic rifaximin with respect to the tion were assessed in all patients at enrolment systemic antibiotic metronidazole in patients af- and 3 days after the end of the treatment. fected by SIBO. Breath H2 Testing GBT was performed under standard condi- tions. In the month preceding the test patients Material and Methods should not have received antibiotics or laxatives. To minimize basal H2 excretion, patients were This prospective parallel-group randomized asked to follow a carbohydrate-restricted dinner trial was conducted between February 2005 and on the day before the test and to fast for at least August 2007 in consecutive out-patients from 12 hours. On the day of testing, patients did a the Gastroenterology and Internal Medicine De- mouthwash with 20 ml of chlorhexidine 0.05%. partments of the Catholic University of Rome, Smoking and physical exercise were not allowed Italy. for 30 minutes before and during the test. End- alveolar breath samples were collected immedi- Inclusion/Exclusion Criteria ately before glucose ingestion. A dose of 50 g of Patients referring to our centre for the pres- glucose in the form of iso-osmotic solution was ence of gastrointestinal symptoms (bloating, ab- administered and samples were taken every 10 dominal pain, flatulence and diarrhoea) since ≥ 6 min for 2 hours respectively using a two-bag months were evaluated. system. The two-bag system is a device consist- 112 Antibiotic therapy in small intestinal bacterial overgrowth: rifaximin versus metronidazole ing of a mouthpiece, a T valve and two collapsi- domly assigned to one of the two 7-day treatment ble bags, the first one collects dead space air, the groups: second one collects alveolar air. The breath sam- ple was aspirated from this bag into a 20 ml 1. Rifaximin 1200 mg/day (2 tablets tid; group 1: plastic syringe. Samples were analyzed immedi- n=71) ately using a model Quintron Gas Chromato- 2. Metronidazole 750 mg/day (1 tablet tid; group graph (Quintron Instrument Company, Milwau- 2: n=71). kee, WI). The test was considered as indicative of the Data Analysis presence of SIBO when the peak, that is the in- For the purpose of the analysis, the incidence crease over the baseline of H2 levels, was of side-effects was considered as a binomial vari- >12 p.p.m.7. able (present/absent). To detect differences in The GBT was repeated 1 month after the end GBT normalization rates and the incidence of of therapy to assess GBT normalization. side-effects, the Χ2 or Fisher’s exact tests were used. Odds Ratio (OR) for achieving GBT nor- Outcomes malization with 95% confidence intervals (95% The primary outcome of the present study was CI) was calculated. The statistical analysis was the GBT normalization rate using rifaximin or performed using STATA 6.0. metronidazole. Secondary outcomes were patient’s compli- ance and incidence of side-effects in the two therapeutic schemes. Results Compliance was assessed by an interview (ad- ministered by a trained physician) performed af- Patients Characteristics and ter the end of the therapy and by a pill count of Overall Compliance the drugs boxes returned at the same interview. A total of 142 patients were enrolled. Charac- Low compliance was defined as more than 20% teristics of the study groups are summarized in of pills returned.
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