Evaluation of a Novel Diagnostic Kit for the Detection of Placental Alpha-Microglobulin-1 in the Prediction of Preterm Birth

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

126 participants

Study Classification

OBSERVATIONAL

Study Start Date

2013-12-31

Study Completion Date

2017-03-31

Brief Summary

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This is a prospective observational trial that will enroll pregnant women between 24 and 36 6/7 weeks of gestation that present with signs and symptom of preterm labor with clinically intact membranes and cervical dilatation ≤ 3 cm and a control group of pregnant women without signs and risks for PTL to assess how the results of the novel kit for the detection of PAMG-1 in both patient groups correlate to their time-to-delivery (TTD) and other adverse neonatal and pregnancy outcomes.

Thes study hypothesis contains that the novel diagnostic kit will identify women who are at high risk for preterm birth by a high positive predictive value.

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Detailed Description

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Background

Placental alpha microglobulin-1 (PAMG-1) is a protein found in high concentrations in amniotic fluid but very low concentrations in background levels of cervico-vaginal discharge. In recent years, the medical community has increasingly accepted the widespread use of detecting PAMG-1 to aid the provider in confirming or ruling out rupture of the fetal membranes (ROM). The test used is commercially marketed as the AmniSure® ROM Test, manufactured by AmniSure® International, LLC, Boston, MA, USA.

In one of the original investigations of PAMG-1 for the detection of ROM, Lee et al. noted that in 20 out of the 23 cases where the AmniSure® ROM Test was positive and standard clinical assessment (i.e. nitrazine, ferning and pooling) was negative, the patient was ultimately determined to have been ruptured upon retrospective analysis of their clinical course. It was later reported that for all of the preterm patients in this group that showed signs and symptoms of labor, delivery followed within 7 days. In 2011, the clinical value of a positive AmniSure® ROM Test in the patient presenting with signs and symptoms of preterm labor (PTL) but without membrane rupture was investigated by this same group. The results demonstrated that the AmniSure® ROM Test was highly predictive of delivery of these patients within 48 hours, 7 days and 14 days.

In the patient group on whom the above tests are performed, membrane rupture is excluded as this condition, if present, confirms imminent delivery and dictates a different course of management. It has been demonstrated that the AmniSure® ROM Test can detect PAMG-1 in patients presenting with signs and symptoms of ROM when all other traditional methods are unable to do so. The likelihoods of adverse outcomes associated with these sub-clinical ruptures have been demonstrated to not be statistically different from the adverse outcomes associated with gross or clinically detectable ruptures. The proposed physiological explanation for this phenomenon is that PAMG-1 is released through micro-perforations of the amniotic membranes that more copious amounts of fluid cannot pass through.

The major difference, however, between the patient presenting with signs of preterm labor and those just described above is the presence, or absence, of membrane rupture signs or complaints. Given that the complaints of ROM are typically rooted in an overt episode of suspicious fluid leakage, it is hypothesized that the resulting concentration of PAMG-1 in the vagina of the patient without such overt complaints or signs of ROM will be lower than the current sensitivity threshold of the AmniSure® ROM Test.

Accordingly, a device that is more sensitive in its detection of PAMG-1 than the AmniSure® ROM Test presumably will be able to detect more patients at risk for imminent delivery than its predecessor in patients presenting to labor and delivery units with signs, symptoms or complaints suggestive of preterm labor (PTL) who have no clinical evidence of membrane rupture. If this is the case, this tool may be of significant value to the provider in deciding how to manage their patients suspected to be at risk for imminent delivery. Management options may include administration of tocolytics to prolong gestation, corticosteroids to improve respiratory development, administration of antibiotics to decrease the risk of infection (intra-partum and post-partum), prescription of bed rest, as well as increased observation and fetal monitoring.

Currently, the American College of Obstetricians and Gynecologists (ACOG) indicate in their most recent Practice Bulletin on the Management of Preterm Labor that many tests to identify women at risk of preterm birth have been proposed and evaluated; however, only ultrasonography and fetal fibronectin testing have been shown to have benefit. Ultrasonography to determine cervical length, fetal fibronectin testing, or a combination of both may be useful in determining which women are at high risk for preterm delivery. However, their clinical usefulness may rest primarily with their ability to identify women who are least likely to deliver (i.e. their negative predictive value). Therefore, there is an urgent need for a test with a high positive predictive value in order to accurately predict imminent delivery to allow for salutary intervention.

Objective

1. To assess the efficacy of the novel kit for the detection of PAMG-1 in the cervico-vaginal secretions of pregnant women with clinically intact membranes presenting with signs and symptoms of PTL in predicting time-to-delivery. Assessment will be stratified by the following gestational age ranges:

1. 24-31 6/7 weeks
2. 32-36 6/7 weeks
2. To compare the results of the novel kit for the detection of PAMG-1 in pregnant women presenting with signs of PTL to a control group of pregnant women with the same gestational age without any symptoms and without an elevated risk of preterm birth.
3. To compare the novel kit for the detection of PAMG-1 to other methods available in assessing time to delivery in the same patient population, including:

1. cervical length measurements by trans-vaginal ultrasound
2. cervical dilatation \> 1 cm
3. Contraction Frequency ≥ 6 per hour (one every 10 min)
4. Determine the association between the results of the kit, cervical length and neonatal outcomes.

Methods

1. Study group: Patient presenting with symptoms of PTL between 24 and 36 6/7 weeks of gestation signs informed consent.

Control group: Patient presenting for routine pregnancy control without any symptoms of PTL is between 24 an 36 6/7 weeks of gestation signs informed consent.
2. Specimen for the PAMG-1 test is collected in accordance with manufacturer's recommendations. During the same examination the physician takes a vaginal microbiological smear.
3. The sample is labeled and stored for later examination by a separate investigator who will not know the results of the physician's regular clinical evaluation.
4. After the physician completes their physical examination of the patient.
5. Cervical length measurement by transvaginal ultrasound (TVU) is performed.
6. Patient delivery data (e.g. time, condition, etc.) are recorded in the follow up.

Conditions

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Preterm Labour Preterm Birth

Study Design

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Observational Model Type

CASE_CONTROL

Study Time Perspective

PROSPECTIVE

Study Groups

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Study group

Study group: women between 24 and 36 6/7 weeks of gestation that present with self-reported signs, symptoms or complaints suggestive of preterm labor

novel kit for the detection of PAMG-1

Intervention Type DEVICE

The novel kit for the detection of PAMG-1 is a diagnostic device employing monoclonal antibodies that detect Placental α1 Microglobulin present in cervico-vaginal secretions manufactured by AmniSure® International, LLC, Boston, MA. The in vivo sensitivity detection threshold is 4ng/ml. During the test procedure, PAMG-1 from the sample sequentially binds to monoclonal antibody conjugated with labeled particles, then to monoclonal antibody immobilized on an insoluble carrier. The test requires a 30 second swab saturation in the vagina (a sterile speculum examination is not required), a 30 second active washing step whereby the swab just removed from the vagina is actively rotated in a solvent filled vial and lastly, a 5 minute waiting period from the time the swab is removed and the test strip is inserted if two testing lines do not appear sooner.

Control group

Control group: women between 24 and 36 6/7 weeks of gestation without signs or symptoms of PTL

novel kit for the detection of PAMG-1

Intervention Type DEVICE

The novel kit for the detection of PAMG-1 is a diagnostic device employing monoclonal antibodies that detect Placental α1 Microglobulin present in cervico-vaginal secretions manufactured by AmniSure® International, LLC, Boston, MA. The in vivo sensitivity detection threshold is 4ng/ml. During the test procedure, PAMG-1 from the sample sequentially binds to monoclonal antibody conjugated with labeled particles, then to monoclonal antibody immobilized on an insoluble carrier. The test requires a 30 second swab saturation in the vagina (a sterile speculum examination is not required), a 30 second active washing step whereby the swab just removed from the vagina is actively rotated in a solvent filled vial and lastly, a 5 minute waiting period from the time the swab is removed and the test strip is inserted if two testing lines do not appear sooner.

Interventions

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novel kit for the detection of PAMG-1

The novel kit for the detection of PAMG-1 is a diagnostic device employing monoclonal antibodies that detect Placental α1 Microglobulin present in cervico-vaginal secretions manufactured by AmniSure® International, LLC, Boston, MA. The in vivo sensitivity detection threshold is 4ng/ml. During the test procedure, PAMG-1 from the sample sequentially binds to monoclonal antibody conjugated with labeled particles, then to monoclonal antibody immobilized on an insoluble carrier. The test requires a 30 second swab saturation in the vagina (a sterile speculum examination is not required), a 30 second active washing step whereby the swab just removed from the vagina is actively rotated in a solvent filled vial and lastly, a 5 minute waiting period from the time the swab is removed and the test strip is inserted if two testing lines do not appear sooner.

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* Patients presenting for emergency obstetrical care at an emergency room or labor \& delivery unit with signs, symptoms or complaints suggestive of preterm labor (PTL)
* Gestational age between 24 and 36 6/7 weeks of gestation
* Consenting to be part of the trial
* Women between 24 and 36 6/7 weeks of gestation without signs or symptoms of PTL
* Written informed consent

Exclusion Criteria

* PROM
* \> 3 cm cervical dilatation
* \< 18 yrs old and not emancipated consenting minor
* Heavy vaginal bleeding
* Cervical dilatation \> 3 centimeters
* Suspected placenta previa
* \< 24 weeks of gestation or ≥ 37 weeks of gestation
* Cervical cerclage in place or cervical pessary
* A symptom not associated with idiopathic threatened preterm delivery (e.g. trauma)
* Enrollment in a tocolytic study

Minimum Eligible Age

18 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

No