CAPA-IVM Culture With Low Oxygen Tension
- Conditions
- In Vitro Fertilization
- Interventions
- Other: Air Oxygen Concentration CAPA-IVM cultureOther: Low Oxygen Concentration CAPA-IVM culture
- Registration Number
- NCT06367985
- Lead Sponsor
- Mỹ Đức Hospital
- Brief Summary
Capacitation in-vitro maturation (CAPA-IVM) has recently been advanced in culturing oocytes from the germinal vesicle (GV) stage following mild or no controlled ovarian stimulation. Recent research suggested that O2 concentration may significantly regulate oocyte maturation and early embryo development through hypoxia-inducible factor (HIF). Nonetheless, it has been challenging to create the environmental culture conditions for addressing the optimal number of oocytes and the highest possibility of embryo development since consensus on the oxygen (O2) concentration index in the IVM culture environment has not been reached. Based on the outcomes of atmospheric O2 concentration (20%) and low O2 concentration (5%) during CAPA-IVM culture in mice, it has been hypothesized that a 5% O2 was the optimal culture condition for the pre-IVM step. A 20% O2 was more suitable for the IVM culture step. Therefore, this study is designed to enhance the CAPA-IVM culture system, improving treatment efficiency and providing various benefits for patients undergoing assisted reproductive technology.
- Detailed Description
Capacitation in-vitro maturation (CAPA-IVM) has recently been advanced in culturing oocytes from the germinal vesicle (GV) stage. This approach is a modified version of conventional in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI), following mild stimulation or no controlled ovarian stimulation occurred. Specifically, IVM can be indicated for patients diagnosed with polycystic ovary syndrome (PCOS), a higher number of secondary follicles (constituting nearly 15% of total patients), and treat a range of patients with the risks of ovarian hyperstimulation, venous thromboembolism or ovarian torsion. Additionally, CAPA-IVM helps shorten treatment time, is less expensive, and upgrades patient convenience without multiple follow-up examinations. The live birth rate after the first embryo transfer in the CAPA-IVM group was 35.2%, which was not statistically significantly different from the IVF group at 43.2% (risk difference -8.1%; 95% confidence interval from -16.6% to 0.5%). However, the number of high-quality embryos in each cycle and the cumulative clinical pregnancy rate in CAPA-IVM were still lower than in cIVF.
Moreover, further investigation should be considered due to the lack of high-quality evidence of concurrent reports. Therefore, improving the oocyte maturation conditions in CAPA-IVM to harvest the optimal number of oocytes and the highest possibility of embryo development is essential. Many studies conducted on both animal and human models have demonstrated that the effectiveness of CAPA-IVM depends on various factors. Among these, the environmental culture conditions such as oxygen (O2) concentration play a crucial role in producing healthy mature oocytes. O2 is a vital physical and chemical component of the fallopian tube, uterus and ovarian follicle, it is closely related to metabolic activity, oocyte maturation, and early embryo development. Recent research suggested that O2 concentration may significantly regulate oocyte maturation and early embryo development through hypoxia-inducible factor (HIF). A consensus on the O2 concentration index in the IVM culture environment has not been reached. Oocyte-embedded culture systems have been commonly used in two O2 concentrations, 5% and 20% worldwide. In the human body, cumulus-oocyte complexes (COCs) mature in conditions with low O2 concentrations ranging from 2% to 9%.
Conversely, COCs are exposed to an atmospheric O2 concentration of 20% during IVM manipulation and culture. Although the concentration of 5% mimics the most proper environment in the fallopian tube and uterus, the 20% O2 is widely applied in IVM techniques. The use of high concentrations facilitates a better progression of differentiation processes and increases the maturation rate of oocytes. However, some referential frames indicated that a 20% O2 may pose a risk of reactive oxidative stress (ROS), leading to an imbalance in the ratio of pro-oxidants to antioxidants, resulting in cellular damage. Furthermore, real-time respiration analysis of oocytes cultured at 5% O2 is similar to in vivo-developed oocytes but induced cellular activity and oxygen consumption at 20% O2. The impact of atmospheric O2 concentration (20%) and low O2 concentration (5%) during CAPA-IVM culture in mice shown in the study of Vrije Universiteit Brussel (VUB) - Belgium that the respiratory capability of COCs cultured at 5% O2 was relatively similar to COCs developing and maturing in vivo.
Nonetheless, COCs cultured at 20% O2 increased respiratory activity and oxygen consumption remarkably. The study observed that pre-IVM culture of COCs at 20% O2 caused developmental disruptions. Also, the result was unfavorable if mouse COCs were cultured at the IVM step with 5% O2. Based on these analyses, the researchers hypothesized that a 5% O2 was the optimal culture condition for the pre-IVM step, while a 20% O2 was more relevant to the IVM culture step. Combining these findings with results from VUB and characteristics of the differentiation process in CAPA-IVM oocytes, this study is divided into two main groups, including 5% pre-IVM and 20% IVM versus 20% pre-IVM and IVM) and demonstrates whether this hypothesis should be applied CAPA-IVM in human. The enhancement of the CAPA-IVM culture system leads to improved treatment efficiency of this technique and provides various benefits for patients undergoing assisted reproductive technology.
Study procedure:
Screening for eligibility
* This trial will be conducted at My Duc Hospital, Ho Chi Minh City, Viet Nam.
* Women who are potentially eligible will be provided information about the trial at the time of IVM treatment indication.
* Screening for eligibility will be performed on the day of the first visit when the IVM treatment is indicated.
* Patients will be provided information related to the study together with the informed consent documents. Signed informed consent forms will be obtained by the investigators from all women before the enrolment.
Oocytes will be divided into 2 groups:
Group 1 (includes 2 subgroups: 1A and 1B): Air Oxygen Concentration CAPA-IVM culture T = Total number of oocytes after OR and there are two subgroups.
The number of oocytes is divided below:
If T is an even number:
* Number of oocytes in Group 1A: One oocyte.
* Number of oocytes in Group 1B: T1B = (T-2)/2.
If T is an odd number:
* Number of oocytes in Group 1A: One oocyte.
* Number of oocytes in Group 1B: T1B = (\[T-1\]-2)/2. One oocyte remainder of the first patient will be assigned to group 1B, and the remainder of the next patient will be assigned to group 2B. Continuing to do so sequentially for the next remainder.
Group 2 (includes 2 subgroups: 2A and 2B): Low Oxygen Concentration CAPA- IVM culture T = Total number of oocytes after OR and there are two subgroups.
The number of oocytes is divided below:
If T is an even number:
* Number of oocytes in Group 2A: One oocyte.
* Number of oocytes in Group 2B: T2B = (T-2)/2.
If T is an odd number:
* Number of oocytes in Group 2A: One oocyte.
* Number of oocytes in Group 2B: T2B = (\[T-1\]-2)/2. One oocyte remainder of the first patient will be assigned to group 1B, and the remainder of the next patient will be assigned to group 2B. Continuing to do so sequentially for the next remainder.
Group 1A, 2A: Collecting after capacitation: oocyte and cumulus cell.
Group 1B, 2B: Collecting after capacitation: spent media, blank well. Collecting after maturation: spent media, cumulus cell, blank well.
Recruitment & Eligibility
- Status
- NOT_YET_RECRUITING
- Sex
- Female
- Target Recruitment
- 20
- 18-42 years of age
- Diagnosed with polycystic ovary syndrome according to the Rotterdam criteria (2003)
- Indicating CAPA-IVM treatment
- Having at least 40 antral follicles in two ovaries by transvaginal ultrasound at the time of CAPA-IVM indication
- Agreeing to have frozen embryo transfer
- Agreeing to participate in the trial
- Cycles with oocyte donation, preimplantation Genetic Testing (PGT)
- Couples with severe male factor (sperm concentration <5 million/ml, motility < 10%), surgical sperm retrieval
- Previous history of unexplained immature oocytes after IVF treatment
- Uterine abnormalities
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Air Oxygen Concentration CAPA-IVM culture Air Oxygen Concentration CAPA-IVM culture Half of the COCs will be cultured in the CAPA step and IVM step at 37 degrees Celsius in air oxygen concentration (20%) and 6% carbon dioxide. Low Oxygen Concentration CAPA-IVM culture Low Oxygen Concentration CAPA-IVM culture Half of the COCs will be cultured in the CAPA step at a low oxygen concentration (5%) and IVM step at an air oxygen concentration (20%); all two steps combine 6% carbon dioxide at 37 degrees Celsius.
- Primary Outcome Measures
Name Time Method Maturation rate Two day after oocyte retrieval The oocyte maturation rate was usually defined by MII oocyte number divided by total COCs number
- Secondary Outcome Measures
Name Time Method Number of good quality Day-3 embryos Three days after intra-cytoplasmic sperm injection Number of grade 1 and grade 2 day-3 embryos
Number of patients with no blastocyst Five or six days after ICSI Counting the number of patients with no blastocyst
Number of 2PN oocytes 16-18 hours after ICSI Number of zygotes with 2 pronuclei after ICSI
Small for gestational age rate At birth Large for gestational age was defined as a birth weight below the 10th percentile
Large for gestational age rate At birth Large for gestational age was defined as a birth weight above the 90th percentile
Number of patients with no matured oocyte Two day after oocyte retrieval Counting the number of patients with no matured oocyte
Fertilization rate 16-18 hours after ICSI Number of fertilized oocytes / number of oocytes inseminated
Abnormal fertilization rate 16-18 hours after ICSI The percentage of zygotes with 1,3, or 4 pronuclei after ICSI / number of oocytes inseminated
Number of patients with no day-3 embryo Five day after oocyte retrieval Counting the number of patients with no embryo
Total number of oocytes retrieval On the day of oocyte retrieval Counting the number of oocytes retrieved
Number of GV oocytes Two day after oocyte retrieval Counting the number of GV oocytes
Number of day-3 embryos Three days after intra-cytoplasmic sperm injection Counting the number of day-3 embryos at 64±2h after ICSI
Number of good quality blastocysts Five days after intra-cytoplasmic sperm injection Number of grade 1 and grade 2 blastocysts
Implantation rate At 3 weeks after embryo transfer after the completion of the embryo transfer Implantation rate is explained as the number of gestational sacs per number of embryos transferred.
Ectopic pregnancy rate 3 weeks after embryo transfer A pregnancy outside the uterine cavity, diagnosed by ultrasound, surgical visualization or histopathology
Very low birth weight rate At birth Birth weight less than 1.500 g
Number of MII oocytes Two day after oocyte retrieval The oocyte maturation was usually defined by MII oocyte number
Number of frozen day-3 embryos Three days after ICSI Counting the numer of frozen day-3 embryos
Number of blastocyst (day 5 or day 6 embryo) Five or six days after ICSI Counting the number of blastocyst at 114±2h/140±2h after ICSI
Number of frozen blastocysts Three days after ICSI Counting the numer of frozen blastocysts
Clinical pregnancy rate 5 weeks after embryo transfer Diagnosed by ultrasonographic visualization of one or more gestational sacs or definitive clinical signs of pregnancy at 6 weeks or more after the onset of last menstrual period. In addition to intra-uterine pregnancy, it includes a clinically documented ectopic pregnancy
Gestational age at birth At birth Calculated by gestational age of all live births
Number of patients with no oocyte retrieved On the day of oocyte retrieval Counting the number of patients with no oocyte retrieved
Quality of embryos transferred (Grade 1, Grade 2, Grade 3) On the day of embryo transfer The quality of transferred embryo is classified according to Alpha Scientists in Reproductive Medicine and ESHRE Special Interest Group of Embryology, 2011; D. Gardner, 1999; D. K. Gardner \& Schoolcrati, 1999
Positive pregnancy test rate 11 days after the day of blastocyst transfer and 13 days after the day of day-3 embryo transfer Positive pregnancy test defined as serum human chorionic gonadotropin level greater than 25 mIU/mL
Mode of delivery At birth Vaginal delivery, C-section (elective, suspected fetal distress, non-progressive labor)
Low birth weight rate At birth Birth weight less than 2.500 g
Very high birth weight rate At birth Birth weight over than 4.500 g for women with diabetes, and a threshold of 5000 g for women without diabetes
Reason for NICU admission At birth Respiratory distress, Intraventricular Hemorrhage, Necrotizing enterocolitis, Sepsis
Number of embryos transferred On the day of embryo transfer Total embryos transferred
Ongoing pregnancy rate 10 weeks after embryo transfer Ongoing pregnancy is defined as pregnancy with a detectable heart rate at 12 weeks' gestation or beyond.
Miscarriage <12 weeks rate (Early miscarriage) 2-10 weeks after embryo transfer Spontaneous loss of pregnancy up to 12 weeks of gestation is referred to as an early
Miscarriage <22 weeks rate (late miscarriage) At >10 to 20 weeks after the transfer Spontaneous loss of pregnancy between 12 to 22 weeks is termed as late miscarriage
Multiple pregnancy rate 4 weeks after embryo transfer Defined as the presence of more than one gestational sac at early pregnancy ultrasound (6-9 weeks gestation)
Birth weight At the time of delivery in grams; of singletons and twins
High birth weight rate At birth Implies growth beyond an absolute birth weight, historically 4.000 g or 4.500 g, regardless of the gestational age
Gestational diabetes mellitus rate At 24 to 28 weeks of gestation Diagnosed according to the latest version of ADA guidelines. a 75-g OGTT, with plasma glucose measurement when patient is fasting and at 1 and 2 h, at 24-28 weeks of gestation in women not previously diagnosed with diabetes.
* Fasting: 92 mg/dL (5.1 mmol/L)
* 1 h: 180 mg/dL (10.0 mmol/L)
* 2 h: 153 mg/dL (8.5 mmol/L)Premature birth rate On the day of delivery Defined as delivery at \<24, \<28, \<32, \<37 completed weeks. A birth that takes place after 22 weeks and before 37 completed weeks of gestational age.
NICU admission rate At birth Counting number of babies admited to neonatal intensive care unit
Live birth rate At 22 weeks of gestation Live birth is defined as the complete expulsion or extraction from a woman of a product of fertilization, after 22 completed weeks of gestational age; which, after such separation, breathes or shows any other evidence of life, such as heartbeat, umbilical cord pulsation or definite movement of voluntary muscles, irrespective of whether the umbilical cord has been cut or the placenta is attached. A birth weight of 500 grams or more can be used if gestational age is unknown. Twins counted as one live birth.
Still birth rate After 20 completed weeks of gestational age defined as the death of a fetus prior to the complete expulsion or extraction from its mother after 20 completed weeks of gestational age. The death is determined by the fact that, after such separation, the fetus does not breathe or show any other evidence of life, such as heartbeat, umbilical cord pulsation, or definite movement of voluntary muscles. It includes deaths occurring during labor
Neonatal mortality rate between eight and 28 days after delivery Neonatal mortality defined as the death of a live-born baby within 28 days of birth. This can be divided into early neonatal mortality, if death occurs in the first seven days after birth, and late neonatal if death occurs between eight and 28 days after delivery
Multiple delivery rate At 22 weeks' gestation Defined as the complete expulsion or extraction from a woman of more than one fetus, after 22 completed weeks of gestational age, irrespective of whether it is a live birth or stillbirth
Major congenital abnormalities rate At birth Structural, functional, and genetic anomalies, that occur during pregnancy, and identified antenatally, at birth, or later in life, and require surgical repair of a defect, or are visually evident, or are life-threatening, or cause death. Any congenital anomaly will be included as followed definition of congenital abnormalities in Surveillance of Congenital Anomalies by Division of Birth Defects and Developmental Disabilities, NCBDDD, Centers for Disease Control and Prevention (2020).
Hypertension in pregnancy rate At 20 weeks of gestation or beyond Comprising pregnancy-induced hypertension (PIH), pre-eclampsia (PET), eclampsia, and HELLP syndrome.
Antepartum haemorrhage rate At birth Defined as bleeding from or into the genital tract, occurring from 24 weeks of pregnancy and prior to the birth of the baby.
Trial Locations
- Locations (1)
My Duc Hospital
🇻🇳Ho Chi Minh City, Vietnam