Fertility Treatment Is Associated with Stay in the Neonatal Intensive Care Unit and Respiratory Support in Late Preterm Infants

Single-centre comparative study of in vitro fertilisation and naturally conceived babies in Indonesia

BACKGROUND

In vitro fertilisation (IVF) offers a solution for infertility but poses increased obstetrical and perinatal risks, including higher rates of preterm birth, low birth weight and congenital anomalies. Particularly, IVF-related multiple pregnancies face significantly higher risks for preterm birth and prolonged hospital stays. This study compares neonatal outcomes between IVF and natural conception, as well as between singleton and IVF-related multiple pregnancies over the past decade.

METHOD

This retrospective study reviewed the medical records of babies born at Cipto Mangunkusumo Kencana Hospital from 2013 to 2023. Neonatal morbidities (hypothermia, hypoglycaemia, respiratory distress, circulation problems, sepsis, congenital anomalies, all stages of intraventricular haemorrhage and retinopathy of prematurity of all babies, neonatal intensive care unit (NICU) admission and length of stay) were dependent variables, with the mode of conception as the independent variable.

RESULT

Of 609 subjects, 169 were IVF conceptions and 435 natural conceptions. The IVF group had higher rates of prematurity (27.8% vs 10.8%, p<0.001), multiple conceptions (37.9% vs 7.4%, p<0.001) and older maternal age (35 vs 30 years, p<0.001). Prematurity in the IVF group had an increased rate of respiratory distress (18.9% vs 12.6%, p=0.05), higher NICU admission rates (13.6% vs 3.2%, p<0.001) and longer hospital stays.

CONCLUSION

IVF pregnancies had higher risks of prematurity and respiratory distress, necessitating personalised antenatal care and close monitoring to optimise neonatal outcomes.

Effects of Assisted Reproductive Technology on Genetics, Obstetrics, and Neonatal Outcomes

The prevalence of infertility has increased in the United States over the past decade with 1 in 5 reproductive-aged women suffering from this diagnosis. The use of assisted reproductive technology (ART) to achieve pregnancy has correspondingly steadily increased. After examining the outcomes of ART births, clear trends of increased preterm birth rate, higher-order multiples, and imprinting disorders have been established among ART-related outcomes. However, the relationship between ART and birth defects, abnormal placentation, and stillbirth require further investigation. This review aims to highlight current literature surrounding ART and its relationship with key obstetrical outcomes, neonatal outcomes, and medical genetics.

In vitro fertilization as an independent risk factor for perinatal complications: Single-center 10 years cohort study

OBJECTIVES

Assisted Reproductive Technology (ART) has made great strides in the past forty-years, but no medical treatment comes without side effects. Despite several studies reporting high incidences of perinatal complications, the association is inconclusive. Also, the effect of racially and ethnically distinguished Asian population undergoing ART on perinatal outcomes is not well studied. Therefore, this study attempts to compare various perinatal outcome parameters in ART, and spontaneously conceived singleton pregnancies from a single high-volume tertiary care center.

METHODS

This is a retrospective cohort study from a single tertiary infertility center, carried out from January 2011 to September 2020. The study included 1,125 IVF conceived babies (AB group) and 7,193 spontaneous conceived babies (SB group). The groups were compared using the Pearson Chi-square test and adjusted odds ratio, calculated using the multivariate analysis.

RESULTS

Most of the perinatal complications, such as preterm birth (PTB), early preterm birth, low birth weight (LBW), extremely low birth weight, small for gestational age, large for gestational age babies, neonatal intensive care unit (NICU) admission, need for surfactant, meconium aspiration syndrome, neonatal seizures, intraventricular hemorrhage, hypoxic-ischemic encephalopathy, and patent ductus arteriosus was significantly increased in the AB group when compared to the SB group (p<0.05). In-vitro fertilization (IVF) independently increases the risk of LBW (aOR 2.530; 95% CI 2.194-2.917), PTB (aOR 4.004; 95% CI 3.496-4.587), NICU admission (aOR 2.003; 95% CI 1.610-2.492) and neonatal seizures (aOR 9.805; 95% CI 5.755-16.706).Conclusions: All ART-conceived pregnant patients should receive antenatal counselling regarding perinatal complications and should deliver at a tertiary care center with appropriate NICU support.

Female fertility treatment and adverse birth outcomes: a multistate analysis of pregnancy risk assessment monitoring system data

OBJECTIVE

The popularity of fertility treatments has continued to rise, however, the potential health risks of these treatments for both mother and infant are not fully known. Our objective was to determine the association between fertility treatments and adverse birth outcomes of intended pregnancies using the Pregnancy Risk Assessment Monitoring System (PRAMS) data.

METHODS

Data from 27,018 intended pregnancies, collected from 2009 to 2018 in the United States, were included in our analysis. PRAMS data consisted of questionnaire and birth certificate data. SAS 9.4 was used for analyses accounting for complex survey weights. All analyses were conducted separately for singleton and twin births. Weighted percentages with 95% confidence intervals (CIs) were estimated for maternal characteristics and birth outcomes. Multivariable logistic regression was used to determine adjusted odds ratios (OR) and 95% CIs for associations of fertility treatment use and adverse birth outcomes.

RESULTS

Close to 12% of women reported the use of any fertility treatment. Among those using fertility treatments, the most common type was assisted reproductive technology (ART) for both twin (68.7%, 95% CI: 62.3, 75.2) and singleton births (45.1%, 95% CI: 42.0, 48.1). Use of any type of fertility treatment for singleton births was associated with increased odds of a cesarean delivery (OR: 1.31, 95% CI: 1.16, 1.47), preterm birth (OR: 1.42, 95% CI: 1.20, 1.67), a small-for-gestational age infant (OR: 1.20, 95% CI: 1.00, 1.44), and an infant hospital stay >5 days (OR: 1.34, 95% CI: 1.11, 1.62). Use of fertility treatment for twin births was associated with cesarean delivery only. In analyses examining associations for specific types of treatment (medication alone, ART, insemination) with birth outcomes, results varied by treatment type.

CONCLUSIONS

In this large population-based sample of women who intended to become pregnant and had a live birth, fertility treatment was associated with adverse birth outcomes. Patients seeking fertility treatment should be appropriately counseled on the risks of adverse maternal and infant birth outcomes overall and by treatment type. Maternal support and resources to prevent adverse birth outcomes among women using fertility treatments are warranted.

Respiratory pathology in late preterm infants conceived by in vitro fertilization

This study aimed to identify the incidence of in vitro fertilization (IVF) in late preterm infants and the presence of respiratory pathology in this premature category compared with those conceived naturally. This retrospective study was performed over 6 months, including newborns with a gestational age between 34–36 weeks and 6 days in the Department of Obstetrics, Gynecology and Neonatology, Alessandrescu-Rusescu National Institute of Mother and Child Health. The following variables were assessed: infants' gestational age, delivery mode, respiratory morbidity, and the need for respiratory support. During the mentioned period, 112 late preterm infants were born, out of whom 9.8% represented late preterm infants conceived by in vitro fertilization. The delivery mode of late preterm infants conceived by in vitro fertilization was exclusively by C-section (100%) compared to those conceived spontaneously (44.5%). 18.1% of IVF late preterm infants developed transient tachypnea of the newborn. In the non-IVF group, respiratory distress syndrome was present in 5.9% and transient tachypnea in 33.6% of cases. No IVF late preterm infant required hospitalization in neonatal intensive care for more than 3 days, compared to 19.8% of naturally conceived late preterm infants. Respiratory distress syndrome very seldom occurs in late preterm IVF infants due to prenatal prophylactic treatment with corticosteroids. Respiratory pathology is rarely present due to very careful monitoring during pregnancy, the presence of a neonatal team in the delivery room for possible resuscitation, and providing proper care according to the good state of health during the short, one-week hospitalization.

Outcomes of Very Preterm Infants Conceived with Assisted Reproductive Technologies

OBJECTIVE

To compare mortality and early respiratory outcomes of very preterm infants conceived via assisted reproductive technology (ART) vs spontaneously.

STUDY DESIGN

We identified inborn infants (July 2014-July 2019) with gestational age <32 weeks (n = 439); 54 cases were ART conceived. Spontaneously conceived controls (n = 103) were matched by multiple gestation status and gestational age. Primary outcome was 1-year mortality. Secondary outcomes were receipt of respiratory support and supplemental oxygen at 7 and 28 days and 36 weeks of postmenstrual age. We evaluated the association between conception method and outcomes by logistic regression, with adjustment for sociodemographic status.

RESULTS

Women who conceived via ART had increased rates of prepregnancy and gestational diabetes, and no differences in rates of hypertensive disorders. Infant 1-year mortality was not different by mode of conception (ART 11.8% vs spontaneous 7.1%, P = .49). Infants conceived by ART were less likely to receive respiratory support or supplemental oxygen at all time points, but this relationship only reached significance for receipt of oxygen at 28 days (ART 20.8% vs spontaneous 39.0%, P = .03); this remained true after adjustment for race/ethnicity and socioeconomic index.

CONCLUSIONS

When controlling for gestational age and multiple gestation status, very preterm infants conceived following ART had similar outcomes as those conceived spontaneously.

Outcomes of pulmonary vascular disease in infants conceived with non-IVF fertility treatment and assisted reproductive technologies at 1 year of age

BACKGROUND

Assisted reproductive technologies (ARTs) have been associated with the development of endothelial dysfunction.

OBJECTIVE

To determine potential differences in outcomes associated with pulmonary vascular disease in infants born to mothers receiving any infertility treatment including ART and non-IVF fertility treatments (NIFTs).

DESIGN/METHODS

The sample was derived from an administrative database containing detailed information on infant and maternal characteristics for live-born infants in California (2007-2012) with gestational age (GA) 22 to 44 weeks. Cases were defined as infants with ICD-9 code for pulmonary vascular disease (PVD) and records for ART/NIFT. Controls were randomly selected at a 1:4 ratio. The primary outcome was 1-year mortality. Crude and adjusted odds ratio (OR) with 95% confidence interval (CI) were calculated.

RESULTS

We identified 159 cases and 636 controls. Mothers that utilized ART/NIFT were older, to be of the Caucasian race, to have pre-eclampsia, private insurance, and education >12 years (P < .001). Cases compared to controls were more premature, had lower birth weights, and were more often the product of a multiple gestation pregnancy (P < .001). Cases had a higher 1-year mortality (18.2% vs 9.1%; OR: 2.2; 95% CI: 1.4, 3.6), more severe PVD (86.2% vs 72.3%; OR: 2.4; 95% CI: 1.5, 3.9), and a longer hospital stay (66.7 ± 73.0 vs 32.5 ± 47.2 days; P < .001) than controls. However, when adjusting for GA these differences become statistically insignificant.

CONCLUSION

Children born following ART/NIFT with PVD had increased mortality compared to infants with PVD but without ART/NIFT. The primary driver of this relationship is prematurity.

Genetics and Epigenetics of Infertility and Treatments on Outcomes

CONTEXT

Infertility affects 10% of the reproductive-age population. Even the most successful treatments such as assisted reproductive technologies still result in failed implantation. In addition, adverse pregnancy outcomes associated with infertility have been attributed to these fertility treatments owing to the presumed epigenetic modifications of in vitro fertilization and in vitro embryo development. However, the diagnosis of infertility has been associated with adverse outcomes, and the etiologies leading to infertility have been associated with adverse pregnancy and long-term outcomes.

EVIDENCE ACQUISITION

We have comprehensively summarized the data available through observational, experimental, cohort, and randomized studies to better define the effect of the underlying infertility diagnosis vs the epigenetics of infertility treatments on treatment success and overall outcomes.

EVIDENCE SYNTHESIS

Most female infertility results from polycystic ovary syndrome, endometriosis, and unexplained infertility, with some cases resulting from a polycystic ovary syndrome phenotype or underlying endometriosis. In addition to failed implantation, defective implantation can lead to problems with placentation that leads to adverse pregnancy outcomes, affecting both mother and fetus.

CONCLUSION

Current research, although limited, has suggested that genetics and epigenetics of infertility diagnosis affects disease and overall outcomes. In addition, other fertility treatments, which also lead to adverse outcomes, are aiding in the identification of factors, including the supraphysiologic hormonal environment, that might affect the overall success and healthy outcomes for mother and child. Further studies, including genome-wide association studies, epigenomics studies, and experimental studies, are needed to better identify the factors leading to these outcomes.

Outcomes of preterm infants conceived with in vitro fertilization

OBJECTIVES

To determine if there is increased risk of prematurity-related complications for in vitro fertilization (IVF)-conceived preterm infants compared to matched controls.

STUDY DESIGN

Cohort study of 23-34 weeks' preterm infants from 329 US NICUs discharged from 2009 to 2016. Each IVF patient was matched to three controls.

RESULTS

We identified 6,756 IVF-conceived preterm infants who were matched with 20,268 controls. IVF-conceived infants had no increase in non-respiratory morbidities but had significantly higher rates of bronchopulmonary dysplasia (8.4% vs 7%, p < 0.001) and significantly greater exposure to common chronic respiratory medications.

CONCLUSIONS

In this large cohort of IVF-conceived preterm infants we found similar outcomes to controls with the exception of bronchopulmonary dysplasia and respiratory medication exposure. Further research is needed to explore the influence of in vitro fertilization on the development of neonatal respiratory disease.

Differences in First-Trimester Maternal Metabolomic Profiles in Pregnancies Conceived From Fertility Treatments

CONTEXT

Maternal metabolic status reflects underlying physiological changes in the maternal-placental-fetal unit that may help identify contributors to adverse pregnancy outcomes associated with infertility and treatments used.

OBJECTIVE

To determine if maternal metabolomic profiles differ between spontaneous pregnancies and pregnancies conceived with fertility treatments that may explain the differences in pregnancy outcomes.

DESIGN

Metabolon metabolomic analysis and ELISAs for 17-β-estradiol and progesterone were performed during the late first trimester of pregnancy.

SETTING

Academic institution.

SUBJECTS

Women in the Spontaneous/Medically Assisted/Assisted Reproductive Technology cohort (N = 409), 208 of whom conceived spontaneously and 201 with infertility [non in vitro fertilization treatments (NIFT), n=90; in vitro fertilization (IVF), n=111].

INTERVENTION

Mode of conception.

MAIN OUTCOME MEASURES

Levels of of 806 metabolites within eight superpathways, 17-β-estradiol, and progesterone in maternal plasma in the late first trimester.

RESULTS

Metabolomic differences in the lipid superpathway (i.e., steroid metabolites, lipids with docosahexaenoyl acyl chains, acyl cholines), and xanthine and benzoate metabolites (P < 0.05) were significant among the spontaneous and two infertility groups, with greatest differences between the spontaneous and IVF groups. 17-β-estradiol and progesterone levels were significantly elevated in the infertility groups, with greatest differences between the spontaneous and IVF groups.

CONCLUSION

Metabolomic profiles differ between spontaneous and infertility pregnancies, likely driven by IVF. Higher levels of steroids and their metabolites are likely due to increased hormone production from placenta reprogrammed from fertility treatments, which may contribute to adverse outcomes associated with infertility and the treatments used.

Differential gene expression during placentation in pregnancies conceived with different fertility treatments compared with spontaneous pregnancies

OBJECTIVE

To identify differences in the transcriptomic profiles during placentation from pregnancies conceived spontaneously vs. those with infertility using non-in vitro fertilization (IVF) fertility treatment (NIFT) or IVF.

DESIGN

Cohort study.

SETTING

Academic medical center.

PATIENT(S)

Women undergoing chorionic villus sampling at gestational age 11-13 weeks (n = 141), with pregnancies that were conceived spontaneously (n = 74), with NIFT (n = 33), or with IVF (n = 34), resulting in the delivery of viable offspring.

INTERVENTION(S)

Collection of chorionic villus samples from women who conceived spontaneously, with NIFT, or with IVF for gene expression analysis using RNA sequencing.

MAIN OUTCOME MEASURE(S)

Baseline maternal, paternal, and fetal demographics, maternal medical conditions, pregnancy complications, and outcomes. Differential gene expression of first-trimester placenta.

RESULT(S)

There were few differences in the transcriptome of first-trimester placenta from NIFT, IVF, and spontaneous pregnancies. There was one protein-coding differentially expressed gene (DEG) between the spontaneous and infertility groups, CACNA1I, one protein-coding DEG between the spontaneous and IVF groups, CACNA1I, and five protein-coding DEGs between the NIFT and IVF groups, SLC18A2, CCL21, FXYD2, PAEP, and DNER.

CONCLUSION(S)

This is the first and largest study looking at transcriptomic profiles of first-trimester placenta demonstrating similar transcriptomic profiles in pregnancies conceived using NIFT or IVF and spontaneous conceptions. Gene expression differences found to be highest in the NIFT group suggest that the underlying infertility, in addition to treatment-related factors, may contribute to the observed gene expression profiles.