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Clinical Trial Details — Status: Not yet recruiting

Administrative data

NCT number NCT03930277
Other study ID # 0354-18-RMB
Secondary ID
Status Not yet recruiting
Phase
First received
Last updated
Start date December 31, 2022
Est. completion date March 1, 2024

Study information

Verified date April 2022
Source Rambam Health Care Campus
Contact Roy Lauterbach, MD
Phone 972-52-9432416
Email r_lauterbach@rambam.health.gov.il
Is FDA regulated No
Health authority
Study type Observational

Clinical Trial Summary

Fetal cardiac monitoring is used during labor. Fetal decelerations may imply fetal hypoxia and distress. Brain activity monitoring is not used to evaluate fetal distress during labor. In this study the investigators intend to use an EEG based algorithm to evaluate and monitor fetal brain activity during the 2nd stage of labor.


Description:

Fetal heart rate (FHR) monitoring is commonly used in order to reduce fetal intrapartum asphyxia or any associated long-term disabilities. The electronic fetal monitoring (EFM) was first described by Hon and others during the 1960s (1) (2) and introduced into clinical practice before any clear evidence of benefits had been demonstrated. The EFM records the fetal heart rate, and characteristics such as baseline, accelerations, decelerations and variability are constantly evaluated in order to assess the hypoxic condition of the fetus and to identify fetal distress. Nevertheless, most of the studies (3-5) demonstrated that abnormal patterns of the fetal heart rate are of low predictive value for intrapartum fetal hypoxia or metabolic acidosis. Among high-risk pregnant woman, the probability of fetal metabolic acidosis in the presence of repeated, variable decelerations is 25%, and 48% in the presence of late decelerations (6). According to the Cochrane review (7) EFM didn't decrease the rates of cerebral palsy (CP), asphyxias complications or perinatal morbidity. The positive predictive value of non-reassuring FHR patterns for the prediction of CP among singleton newborns with birth weight of 2500 grams or more is only 0.14% (8). Hypoperfusion to a certain brain areas involves the rapid loss of brain function due to disturbances in brain blood supply. EEG shows typical changes in brain ischemia. These changes include: attenuation of faster waves, particularly in the beta and alpha frequency bands; enhancement of slower waves, mainly in the delta frequency band; regional attenuation without delta enhancement (RAWOD) and reduction of variability in the EEG signal (9). However, reaching effective sensitivity and specificity in immediate brain ischemia detection on the basis of EEG changes is still considered a challenge, as it depends on the presence of a skilled expert in neurophysiology to analyses raw EEG data in real-time. The investigators developed a unique platform algorithm, which analyses EEG data, and recognizes patients suffering from brain ischemia (stroke), based on the phenomena of interhemispheric decreased synchronization. Interhemispheric synchronization is the measure of correlation in EEG activity between ipsilateral and contralateral hemispheres, where values range between 1 (complete synchronization) and 0 (no synchronization). Increased synchronization means greater correlation between related ipsilateral and contralateral activities and vice versa for decreased synchronization. Normal brains should have a high correlation/ synchronization. Once brain ischemia occurs and the hemisphere is damaged, the interhemispheric synchronization decreases. In a recent study, we have shown the decrease in synchronization when a certain part of the brain is anaesthetized, causing a lesion similar to brain ischemia, and the recovery of synchronization, when the anesthesia recovered2. In another study, the investigators have tested the reliability of the algorithm in patients undergoing mechanical thrombectomy for acute stroke. In the study patients with acute stroke admitted to neuro angio intervention undergone short EEG test for 5 minutes. At the end of the procedure patients underwent a second short EEG test. In the test the interhemispheric synchronization were analyzed. It was shown that patients admitted to the neuro-angio intervention, who had brain tissue that might be salvable, had an average synchronization of 0.8. If the procedure succeeded and there was a clinical improvement - the synchronization remained high. If the procedure did not succeed, or succeed without clinical improvement, the synchronization decreased to an average of 0.65. Importantly, patients who were not candidates for neuro intervention, because they didn't have salvable brain, their index of synchronization was low to begin with (figure 1a and 1b). This preliminary assay proves the ability of the synchronization index to detect brain hypoperfusion that occurs, for example, in stroke. The objective of this proof of concept study is to test whether there is a correlation between the EEG index of interhemispheric synchronization, to the umbilical PH of the newborn and to the gold standard fetal heart rate monitor.


Recruitment information / eligibility

Status Not yet recruiting
Enrollment 20
Est. completion date March 1, 2024
Est. primary completion date December 31, 2023
Accepts healthy volunteers
Gender Female
Age group 18 Years to 45 Years
Eligibility Inclusion Criteria: - Vaginal delivery course. - Patient with epidural anesthesia. - Continous fetal heart-rate monitoring. - Singleton pregnancy. - Term pregnancy. Exclusion Criteria: - Suspected Chorioamnionitis. - No epidural anesthesia. - Multiple pregnancy. - Fetal abnormality with emphasis on brain abnormalities. - Preeclampsia. - Patients refusing continous fetal heart-rate monitoring. - Patients in need of a scalp electrode for fetal monitoring. - Patients that received Dolestine during labor. - Patients with Hepatitis B, Hepatitis C and HIV carriers or any other vertically transmitted pathogenic agent.

Study Design


Related Conditions & MeSH terms


Intervention

Diagnostic Test:
Electroencephalogram
Electroencephalogram for fetal brain activity monitoring.

Locations

Country Name City State
n/a

Sponsors (1)

Lead Sponsor Collaborator
Rambam Health Care Campus

Outcome

Type Measure Description Time frame Safety issue
Primary Newborn blood gases Correlation between the EEG index of interhemispheric synchronization, to the umbilical PH of the newborn and to the gold standard fetal heart rate monitor. From the beginning of the 2nd stage of labor up to 5 minutes postpartum.
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