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Microorganism in Overactive Bladder Patients

This study has been completed.
Information provided by:
Samsung Medical Center Identifier:
First received: April 16, 2009
Last updated: July 5, 2009
Last verified: June 2009
The objective of this prospective study is to determine the incidence of mycoplasma in women with overactive bladder (OAB) symptoms and whether antibiotic therapy targeting these organisms is effective.

Condition Intervention Phase
Overactive Bladder Drug: azithromycin, doxycycline Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Detection and Treatment Benefit of Microorganism (Chlamydia Trachomatis, Mycoplasma Hominis, Ureaplasma Urealyticum) in Overactive Bladder Patients

Resource links provided by NLM:

Further study details as provided by Samsung Medical Center:

Primary Outcome Measures:
  • Percentage of positive cultures for M. hominis, U. urealyticum and C. trachomatis in women with OAB symptoms. [ Time Frame: Baseline ]

Secondary Outcome Measures:
  • Reduction rate in urinary frequency after treatment in women with positive culture at baseline. [ Time Frame: 2 weeks after treatment ]
  • Changes in mean urgency episodes, PPBC scores, BFLUTS questionnaire and PPTB after treatment in women with positive culture at baseline. [ Time Frame: 2 weeks after treatment ]

Enrollment: 84
Study Start Date: January 2007
Study Completion Date: December 2007
Primary Completion Date: December 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Antibiotics therapy Drug: azithromycin, doxycycline

azithromycin 1g once for women with positive cultures at baseline

doxycycline 100 mg twice daily for 7 days for women with persistent infection after treatment of azithromycin 1g

Other Names:
  • azithromycin
  • doxycycline

Detailed Description:

Overactive bladder (OAB) syndrome is described as 'urgency, with or without urge incontinence, usually with frequency and nocturia' by the 2002 ICS Terminology Committee. A variety of medical conditions share the symptoms of OAB, and it is important to exclude these in the process of diagnosis. Urinary tract infection (UTI) is the most frequent alternative diagnosis. Even in patients considered to have interstitial cystitis, OAB is a high probability of diagnosis due to its insidious onset of irritative symptoms.For these reasons, ICS Terminology Committee stated that the term OAB can be used only if there is no proven infection or other obvious pathology.

Isolating causative organisms through urine culture plays a crucial role, but is likely to reveal a positive result in less than half of patients presenting with irritative symptoms. Even though ordinary bacteria are not cultured from these patients, there is some evidence to suggest that atypical organisms, such as genital mycoplasma, may be associated with OAB symptoms. For example, 48% of patients with chronic voiding symptoms showed positive cultures for Ureaplasma urealyticum and Mycoplasma hominis. In 91% of the patients with positive culture, symptom severity and frequency were improved after treatment. Another evidence for mycoplasmal involvement in OAB symptoms derives from the improvements in symptoms in more than two-thirds of patients complaining of persistent frequency and urgency after the use of doxycyline which is effective against U. urealyticum, M. hominis and Chlamydia trachomatis.

Mycoplasmas are the simplest micro-organisms regarded as true bacteria. They are highly pleomorphic parasites of humans and the absence of a cell wall has been used to distinguish mycoplasma and to place them taxonomically in the class Mollicutes.Mycoplasmas are not generally viewed as being highly virulent, although they usually manifest a predilection for particular host tissues, such as the urogenital or respiratory tracts. It is now being recognized that these organisms play a more important role in human infections than was previously thought. Its slow-growing, non-culturable nature enables them to establish chronic infections, resist the effects of antibiotics and protect the organisms against immune system reactivity.Accordingly, for patients presenting with irritative bladder symptoms, and especially whose first culture is negative, a further culture may be indicated to test specifically for Mycoplasma or Chlamydia infection.


Ages Eligible for Study:   20 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Women age of 20 ≤ and ≤ 80 years
  2. Symptoms of urinary frequency (≥8 micturitions per 24 hours) and urinary urgency (defined as a level of 3 to 5 in a 5 point urgency scale) at least one episode a day as verified by baseline micturition diary
  3. Symptoms of overactive bladder, including, urgency, frequency, and/or urinary urge incontinence for more than 3 months
  4. No proven ordinary bacteria on routine urine culture or gram stain
  5. Positive for one of Mycoplasma homonis, Ureaplasma Urealyticum and Chlamydia trachomatis on urethral or cervical swab

Exclusion Criteria:

  1. Neurogenic bladder
  2. Indwelling catheter
  3. PVR ≥ 150ml
  4. Interstitial cystitis
  5. History of radiation therapy on pelvic area or chemotherapy
  6. unable to record voiding diary
  7. Pregnancy
  8. Other reasons according to investigator's opinion
  Contacts and Locations
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Please refer to this study by its identifier: NCT00883818

Korea, Republic of
Inha University College of Medicine
Inchon, Korea, Republic of
Kangnam St. Mary's Hospital, The Catholic University of Korea
Seoul, Korea, Republic of, 137-701
Asan Medical Center, Ulsan College of Medicine
Seoul, Korea, Republic of
Sponsors and Collaborators
Samsung Medical Center
Principal Investigator: Kyu-Sung Lee, Ph.D Samsung Medical Center
  More Information

Responsible Party: Kyu-Sung Lee/Professor, Samsung Medical Center Identifier: NCT00883818     History of Changes
Other Study ID Numbers: 2006-12-027
Study First Received: April 16, 2009
Last Updated: July 5, 2009

Keywords provided by Samsung Medical Center:
Overactive bladder

Additional relevant MeSH terms:
Urinary Bladder, Overactive
Urinary Bladder Diseases
Urologic Diseases
Lower Urinary Tract Symptoms
Urological Manifestations
Signs and Symptoms
Anti-Bacterial Agents
Anti-Infective Agents
Antiprotozoal Agents
Antiparasitic Agents processed this record on August 22, 2017