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Medico-economic Impact of Screening Atopobium Vaginae and Gardnerella Vaginalis in Molecular Biology by "Point-of-care" During Pregnancy (AuTop)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02288832
Recruitment Status : Completed
First Posted : November 11, 2014
Last Update Posted : April 13, 2023
Information provided by (Responsible Party):
Assistance Publique Hopitaux De Marseille

Brief Summary:

Infection is the principal cause of preterm births. Most (90%) women with preterm deliveries have no abnormal history. It is widely agreed that preterm delivery is often associated with bacterial vaginosis. One of the major difficulties at this time is that the diagnosis of bacterial vaginosis is based on heterogeneous criteria. The technique currently used is the Nugent score, but it lacks the characteristics necessary for widespread use in the general population. It must be performed on a fresh swab, and any delay in transporting it can cause drying that makes the test difficult to perform.

The investigators have developed a rapid diagnostic tool for bacterial vaginosis using molecular biology based on a point of care model and obtained a patent (European Patent Office N° 2087134). In comparison with the reference techniques, our tool's performance has been excellent, in terms of specificity, sensitivity, and positive and negative predictive values. In particular, our work showed that 57% of the flora samples rated as intermediate on the Nugent score were in reality true bacterial vaginosis. Molecular biology therefore identifies a homogeneous population of women with vaginal flora anomalies. The investigators recently showed that the carriage of Atopobium vaginae and/or Gardnerella vaginalis >105/mL shortens the time to delivery in a population at risk of preterm delivery (PHRC 2006). Vaginal flora anomalies are therefore an important target for preventing preterm delivery.

Condition or disease Intervention/treatment Phase
Low Risk of Preterm Delivery Other: -self-collected vaginal samples Drug: zithromax Other: usual practices Phase 2 Phase 3

Detailed Description:
The principal objective is to use a cost-effectiveness study to assess the medical and economic impact of a new strategy for the screening and subsequent treatment of vaginal flora anomalies before the 20th week of gestation- molecular biology techniques (PCR for A. vaginae and G. vaginalis by point-of-care testing) will test self-collected vaginal samples in a population of pregnant women at low risk of preterm delivery. There are multiple secondary objectives, including assessment of the effect of the strategy on the following indicators- delivery before 26, 32, and 37 weeks. Methods-An open-label prospective randomized study will compare 2 groups with different management of their pregnancies. Pregnant women at low risk, regardless of any symptoms, will be randomized into 2 groups. The study will not include women at high risk of preterm delivery. Innovative strategy (group A)- these women will undergo routine screening for bacterial vaginosis by analysis of their self-collected vaginal samples with this innovative technique.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 6800 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Screening
Official Title: Medico-economic Impact of Screening Atopobium Vaginae and Gardnerella Vaginalis in Molecular Biology by "Point-of-care" During Pregnancy
Actual Study Start Date : March 6, 2015
Actual Primary Completion Date : July 1, 2018
Actual Study Completion Date : October 21, 2022

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Pregnancy

Arm Intervention/treatment
Experimental: Innovative strategy (group A):
these women will undergo routine screening for bacterial vaginosis by analysis of their self-collected vaginal samples with this innovative technique; if the test is found to be positive, an appropriate treatment will be prescribed. The POC (point-of-care) test will be considered positive if: A. vaginae is detected at a threshold > 105.copies per ml and/or G. vaginalis > 105 copies per ml. The women with vaginosis will be screened monthly for recurrences through 28 weeks, and recurrence will be treated.
Other: -self-collected vaginal samples
Drug: zithromax
Other Name: azithromycine

Standard strategy (group B):
This group will be followed according to the usual practices of the physicians seeing them.
Other: usual practices

Primary Outcome Measures :
  1. the incremental cost-effectiveness [ Time Frame: 30 months ]

    the incremental cost-effectiveness ratio between the two groups corresponding to the cost of preterm birth before 37 avoided.

    • average differential effect in terms of preterm birth before 37 weeks of 0.013. A preterm birth rate of 0.043 (+/- 0.043) is expected in the group B and 0.03 (+/- 0.03) in Group A;
    • Cost differential means € 230 +/- 35. This difference takes into account the estimated EFC (initial and recurrent) cost and estimated cost of treatments vaginosis cases (10% of patients);
    • Cost-effectiveness threshold of 22,500 euros corresponding to the average cost ratio that is could avoid caring for a child born prematurely before 37 weeks as documented in the international literature (Petrou 2012);

Secondary Outcome Measures :
  1. the delivery rate before 26, 28, 32 and 37 weeks [ Time Frame: 30 months ]
  2. the rate of rupture of membranes [ Time Frame: 30 months ]
  3. the rate of intrauterine growth retardation [ Time Frame: 30 months ]
  4. the rate of endometritis [ Time Frame: 30 months ]
  5. the preterm birth rate adjusted [ Time Frame: 30 months ]
  6. he total duration of hospitalization and earlier for postpartum mother and newborn in number of days [ Time Frame: 30 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Women over 18 years with a pregnancy before 20 weeks are some parity and gravidity;
  • Woman who understood the process and the objectives of the study and who agreed to sign an informed consent;
  • Without a history of premature birth or late abortion (population at low risk of preterm birth);
  • Having no major risk factors for prematurity: insulin-dependent diabetes, systemic lupus erythematosus, hypertension, uterine malformation, cone biopsy, multiple pregnancy;
  • No pre-existing hypertension;
  • Asymptomatic or symptomatic regarding the diagnosis of bacterial vaginosis.

Exclusion Criteria:

  • Woman withdrawing her consent during the study

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02288832

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Assistance Publique Hopitaux de Marseille
Marseille, France, 13354
Hôpital Nord Assistance Publique Hôpitaux de Marseille
Marseille, France, 13915
Sponsors and Collaborators
Assistance Publique Hopitaux De Marseille
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Study Director: Urielle DESALBRES Assistance Publique Hopitaux De Marseille
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Assistance Publique Hopitaux De Marseille Identifier: NCT02288832    
Other Study ID Numbers: 2014-001559-22
RCAPHM14_0085 ( Other Identifier: AP HM )
First Posted: November 11, 2014    Key Record Dates
Last Update Posted: April 13, 2023
Last Verified: November 2015
Additional relevant MeSH terms:
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Premature Birth
Obstetric Labor, Premature
Obstetric Labor Complications
Pregnancy Complications
Female Urogenital Diseases and Pregnancy Complications
Urogenital Diseases
Anti-Bacterial Agents
Anti-Infective Agents