Electrical Inhibition of Human Preterm Contractions
Study Details
Study Description
Brief Summary
The purpose of this study is to explore a new method to stop preterm uterine contractions using an electrical device. The device, an "electrical pacemaker for the uterus," has been approved by the Food and Drug Administration (FDA) for clinical research in pregnant women. The purpose of this study is to evaluate the feasibility and safety of the device. The investigators hypothesize that human preterm uterine contractions can be safely and objectively inhibited with a weak electrical current provided by an electrical inhibition (EI)/uterine pacemaker device, and that this effect relates to the timing and length of EI exposure.
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
N/A |
Detailed Description
The purpose of this study is to determine the effectiveness of a new method of preventing the human preterm uterine contractions of labor during electrical monitoring. The objective is to test a method for the inhibition of human preterm uterine contractions with an electrical pacemaker, electrical inhibition (EI). The study will investigate EI associated changes in preterm uterine contraction frequency as monitored by objective uterine tocodynamometry and adjunct electromyography (EMG) and electrohysterogram (EHG). The endpoint is the statistically significant EI induced decrease in the gold standard tocodynamometric monitored preterm uterine contraction frequency. The adjunct EMG and EHG monitoring provides valuable adjunct data about the electrical activity of the preterm uterine contractions and the effect of EI on this activity.
The investigators hypothesize that human preterm uterine contractions can be safely and objectively inhibited with a weak electrical current provided by an electrical inhibition (EI)/uterine pacemaker device. This effect can be assessed by the use of a non-invasive tocodynamometer. It has been previously been shown that the frequency of contractions during preterm labor can be lowered by EI applied by the use of an intravaginal catheter carrying electrodes similar to a cardiac pacemaker (Karsdon et al). The investigators hypothesize that this effect relates to the timing and length of EI exposure.
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Experimental: 60 Minute Study After a 20-minute pre-intervention control period the electrical inhibition will be used intermittently, only when there is monitored contraction, during the 20-minute intervention study period. At the end of the intervention period there will be a 20-minute post-intervention control period. The FHR patterns, tocogram, EMG and EHG, and fECG recordings will be compared to before and after the use of the electrical uterine pacemaker device. |
Device: Electrical Uterine Pacemaker
The catheter is placed under ultrasound guidance into the posterior vaginal fornix next to the external cervical os. The electrode connectors are attached to the EI device. Activating the EI device involves: 1) turning the current pulse duration rotary dial clockwise to the desired setting; this is an important setting and should be set at 20ms; 2) turning the current frequency rotary dial clockwise to the desired setting; 3) turn on the EI device on with the on/off toggle switch; 4) SLOWLY turning the current strength rotary dial clockwise to the desired setting, at this time the red light should be flashing. Usually 5-10mA of current is sufficient, but 20 mA is a maximum. Based on the tocometer recordings the least amount of EI current is given to inhibit the uterine contractions.
|
| Experimental: 80 Minute Study After a 20-minute pre-intervention control period the electrical inhibition will be used intermittently, only when there is monitored contraction, during the 40-minute intervention study period. At the end of the intervention period there will be a 20-minute post-intervention control period. The FHR patterns, tocogram, EMG and EHG, and fECG recordings will be compared to before and after the use of the electrical uterine pacemaker device. |
Device: Electrical Uterine Pacemaker
The catheter is placed under ultrasound guidance into the posterior vaginal fornix next to the external cervical os. The electrode connectors are attached to the EI device. Activating the EI device involves: 1) turning the current pulse duration rotary dial clockwise to the desired setting; this is an important setting and should be set at 20ms; 2) turning the current frequency rotary dial clockwise to the desired setting; 3) turn on the EI device on with the on/off toggle switch; 4) SLOWLY turning the current strength rotary dial clockwise to the desired setting, at this time the red light should be flashing. Usually 5-10mA of current is sufficient, but 20 mA is a maximum. Based on the tocometer recordings the least amount of EI current is given to inhibit the uterine contractions.
|
| Experimental: 120 Minute Study After a 20-minute pre-intervention control period the electrical inhibition will be used intermittently, only when there is monitored contraction, during the 80-minute intervention study period. At the end of the intervention period there will be a 20-minute post-intervention control period. The FHR patterns, tocogram, EMG and EHG, and fECG recordings will be compared to before and after the use of the electrical uterine pacemaker device. |
Device: Electrical Uterine Pacemaker
The catheter is placed under ultrasound guidance into the posterior vaginal fornix next to the external cervical os. The electrode connectors are attached to the EI device. Activating the EI device involves: 1) turning the current pulse duration rotary dial clockwise to the desired setting; this is an important setting and should be set at 20ms; 2) turning the current frequency rotary dial clockwise to the desired setting; 3) turn on the EI device on with the on/off toggle switch; 4) SLOWLY turning the current strength rotary dial clockwise to the desired setting, at this time the red light should be flashing. Usually 5-10mA of current is sufficient, but 20 mA is a maximum. Based on the tocometer recordings the least amount of EI current is given to inhibit the uterine contractions.
|
Outcome Measures
Primary Outcome Measures
- Uterine contraction frequency during labor as measured by external uterine tocodynamometric monitoring [Change from 20, 40, and 80 minutes]
Secondary Outcome Measures
- FHR pattern as measured by the maternal-fetal monitor [Change from 60 and 120 minutes]
- EMG monitoring as measured by LaborView Device [Change from 60 and 120 minutes]
- EHG monitoring as measured by LaborView Device [Change from 60 and 120 minutes]
- fECG monitoring as measured by LaborView Device [Change from 60 and 120 minutes]
- Maternal pain medication administration [Before and after use of electrical uterine pacemaker, assessed up to 120 minutes]
- Maternal heart rate [Change from 60 and 120 minutes]
Other Outcome Measures
- Adverse events [Before and after use of electrical uterine pacemaker, assessed up to 120 minutes]
Eligibility Criteria
Criteria
Inclusion Criteria:
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Wong-Baker pain score ≤ 6
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Pregnancy Depression Scale score < 16
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Informed consent form signed and dated by patient
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Be willing and able to comply with study requirements
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Be between 18 - 50 years of age
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Be between 23 to 34 weeks pregnant with a singleton gestation
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Cervical dilation of ≤ 6 cm
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Normal spontaneous vaginal delivery (NSVD) expected.
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Be in preterm labor, as defined by the American College of Obstetricians and
Gynecologists and the American Academy of Pediatrics, as follows:
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Persistent uterine contractions (4 every 20 minutes, or 8 every 60 minutes)
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And any one or more of the following:
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Documented cervical change
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1cm cervical dilatation and progressing
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80% cervical effacement
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Be admitted to Labor and Delivery with the diagnosis of preterm labor or preterm contractions
Exclusion Criteria:
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Severe preeclampsia
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Severe abruption placenta
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Abnormal placentation (i.e. placenta previa)
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Rupture of amniotic membranes
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Active preterm labor with cervical dilation > 6 cm
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Exposed amniotic membranes
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Vaginal bleeding > 10 cc
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Frank chorioamnionitis
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Fetal death
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Fetal anomaly incompatible with life
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Severe fetal growth restriction (EFW < 5%)
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Uterine anomalies (i.e. bicornuate uterus, uterine didelphys)
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Mature fetal lung studies
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Maternal cardiac arrhythmias
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HIV, Hepatitis C, Hepatitis B
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History of herpes simplex virus (HSV)
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A permanent cardiac pacemaker
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A fetal cardiac arrhythmia
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Contraindication for tocolysis e.g. premature rupture of the amniotic membranes allowing for ascending intrauterine infection with group B streptococcus or GBS (beta hemolytic streptococcus, S. agalactiae) or other micro-organisms.
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IV or po narcotic pain medication < 12 hours prior to admission (regional anesthesia, long acting oral maintenance opiates i.e. methadone, Suboxone, Subutex not included in exclusion criteria)
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | University of Florida | Gainesville | Florida | United States | 32610 |
Sponsors and Collaborators
- University of Florida
- Inch, Inc
- Convergent Engineering
Investigators
- Study Chair: Jeffrey Karsdon, MD, New York University Lagone Medical Center
- Principal Investigator: John Smulian, MD, University of Florida
Study Documents (Full-Text)
None provided.More Information
Publications
- IRB201601699 - A
- OCR26522