Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Supplementary oxygen is routinely administered to patients, even those with adequate oxygen saturations, in the belief that it increases oxygen delivery. However, oxygen delivery depends not just on arterial oxygen content but also on perfusion.
Maternal oxygen administration has been used in an attempt to lessen fetal distress by increasing the available oxygen from the mother. However, the effect of supplemental maternal oxygen therapy on fetal acid base status has been debated for more than seven decades.
The investigators found the use of 2 L/min maternal oxygen during the second stage of labor did not adversely affect either the umbilical artery pH value or the fetal heart rate (FHR) pattern distribution.
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| Label | Type | Description | Intervention Names |
|---|---|---|---|
| air, the first and second stage of labor | No Intervention | Patients randomized to the group will receive room air. The therapy will continue until after delivery | |
| oxygen, the first and second stage of labor | Experimental | Patients randomized to the group will receive oxygen administered by high flow facemask oxygen at 10 L/min oxygen. The therapy will continue until after delivery |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| tight-fitting simple facemask | Device | Oxygen will be administered by facemask at 10 L/min oxygen. The therapy will continue until after delivery |
|
| Measure | Description | Time Frame |
|---|---|---|
| Cord arterial pH values | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Cord arterial partial pressure of oxygen | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Cord arterial partial pressure of carbon dioxide | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Cord venous pH values | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Cord venous partial pressure of oxygen | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Cord venous partial pressure of carbon dioxide | Immediately after delivery (within 30-60 seconds of birth), blood gas sample will be obtained. | within 30 to 60 seconds of birth |
| Measure | Description | Time Frame |
|---|---|---|
| Rate of abnormal fetal heart tracing | at 1 minute after birth |
| Measure | Description | Time Frame |
|---|---|---|
| Rate of cesarean delivery | at 1 minute after birth | |
| Rate of assisted vaginal delivery | at 1 minute after birth | |
| Apgar score less than 7 |
Inclusion Criteria:
at term (>37 weeks, <42 weeks), singleton, cephalic presentation, spontaneous or induced labor, normal labor, category I FHR tracings, 2 to 3 cm of cervical dilation in nulliparity, 1 to 2 cm of cervical dilation in multipara, informed consent.
Exclusion Criteria:
respiratory or cardiovascular disease, diabetes mellitus or insulin-treated gestational diabetes mellitus, hypertension or preeclampsia, oligohydramnios, fetal growth restriction, placental abruption, cephalopelvic disproportion, meconium-stained amniotic fluid, tachysystole, having received O2, uterine incision (myomectomy or perforation), anemia, fever, chorioamnionitis, tobacco or alcohol use, disorders in oxygen saturations, hypotension, uncomfortable with facemask.
Not provided
Not provided
Not provided
Not provided
Not provided
| Name | Affiliation | Role |
|---|---|---|
| Yunhai Chuai, Dr | Sixth Medical Center, Chinese PLA General Hospital | Principal Investigator |
| Fang Chuai | Sixth Medical Center, Chinese PLA General Hospital | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Department of Obstetrics and Gynecology, PLA Strategic Support Force Characteristic Medical Center | Beijing | China | ||||
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 37441500 | Background | Chuai F, Dong T, Liu Y, Jiang W, Zhang L, Chen L, Chuai Y, Zhou Y. The effect of intrapartum prolonged oxygen exposure on fetal metabolic status: secondary analysis from a randomized controlled trial. Front Endocrinol (Lausanne). 2023 Jun 27;14:1204956. doi: 10.3389/fendo.2023.1204956. eCollection 2023. | |
| 35580635 | Background |
Not provided
Not provided
Not provided
| ID | Term |
|---|---|
| D005316 | Fetal Distress |
| ID | Term |
|---|---|
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
The Apgar scale is determined by evaluating the newborn baby on five simple criteria on a scale from 0 to 2, then summing up the five values thus obtained. The resulting Apgar score ranges from 0 to 10. The five criteria are summarized using words chosen (Appearance, Pulse, Grimace, Activity, Respiration). The infant is given a score of 0, 1 or 2. The scores are added up and the total sum is their Apgar score. The test is generally done at one and five minutes after birth, and may be repeated later if the score is and remains low. Scores 7 and above are generally normal, 4 to 6 fairly low, and 3 and below are generally regarded as critically low. |
| at 1 and 5 minutes after birth |
| Rate of serious neonatal morbidity or death | within 28 days of birth |
| Cord arterial plasma liquid chromatography mass spectrometry analysis | The systematic identification and quantitation of all the metabolic products (mainly endogenous small molecule compounds with relative molecular weight within 1000 Da) of cord arterial plasma under oxygen and room air conditions. Immediately after delivery (within 30-60 seconds of birth), blood plasma sample will be obtained. | within 30 to 60 seconds of birth |
| Department of Obstetrics and Gynecology, Seventh Medical Center, Chinese PLA General Hospital |
| Beijing |
| China |
| Department of Obstetrics and Gynecology, Sixth Medical Center, Chinese PLA General Hospital | Beijing | China |
| Chuai Y, Jiang W, Zhang L, Chuai F, Sun X, Peng K, Gao J, Dong T, Chen L, Yao Y. Effect of long-duration oxygen vs room air during labor on umbilical cord venous partial pressure of oxygen: a randomized controlled trial. Am J Obstet Gynecol. 2022 Oct;227(4):629.e1-629.e16. doi: 10.1016/j.ajog.2022.05.028. Epub 2022 May 14. |