Umbilical Cord Arterial Blood pH Research Articles

Perinatal Birth Asphyxia Among Newborns at Jiblah Public Health Hospital in Ibb City, Yemen, During Six Years of Conflict and Its Predictive Factors: A Retrospective Cross-Sectional Study.

Birth asphyxia is a major cause of infant death across the world, especially in developing countries, where the issue is significantly underreported and underestimated, particularly in fragile and conflict-affected states. The purpose of this study was to determine the prevalence and risk factors for birth asphyxia in women at Jiblah University Hospital in Ibb, Yemen, and its predictive factors throughout six years of conflict. We conducted a retrospective cross-sectional chart review and analysis of the birth database spanning from June 2013 to September 2019 at Jiblah University Hospital in Ibb, Yemen. We used APGAR (appearance, pulse, grimace, activity, and respiration) scores <7 at both the first- and fifth-minute post-delivery with umbilical cord arterial blood pH <7 (metabolic acidosis) and/or neurologic manifestations (seizures or an altered tone) within the first 24 hours of life to define birth asphyxia cases. Factors associated with birth asphyxia were analyzed using univariate and multivariate regression analysis with an odds ratio (OR) and 95% confidence interval (CI). A total of 5,193 neonates were delivered during the study period. The prevalence of birth asphyxia in 309 (6%) neonates. In a multivariate analysis, illiteracy (OR: 2.90; 95% CI: 0.98-8.41), referred mothers (OR: 3.04; 95% CI: 1.42-6.40), advanced maternal age (OR: 1.05; 95% CI: 1.02-1.07), home delivery (OR: 6.50; 95% CI: 3.09-12.57), prematurity (OR: 1.43; 95% CI: 1.05-1.93), and low birth weight (OR: 3.09; 95% CI: 1.93-4.93) were predictors for birth asphyxia and were statistically significant (p<0.05). In this study, the prevalence of birth asphyxia was equivalent to that of other underdeveloped nations. However, continual attention and treatments are required to lower the risk of birth asphyxia. Illiteracy, referred mothers, advanced maternal age, home delivery, prematurity, and low birth weight were all predictors of birth asphyxia in this research. Most birth asphyxia factors mentioned in this study can be managed through effective prenatal, intrapartum, and postpartum care, as well as a strict following of national obstetrics and neonatal guidelines.

Umbilical cord arterial blood pH an indicator of rise in cesarean section rate due to false-positive indications by CTG

Background: Cesarean section rate is rising globally, now accounting for more than 1 in 5 (21%) of all childbirths. This number is set to continue increasing over the coming decade unless the factors which increase the rate of cesarean section are kept in check. Intrapartum cardiotocography (CTG) has shown a false-positive rate of cesarean section. This has been correlated with neonatal umbilical cord blood pH analysis. Aims and Objectives: (1) Correlation of non-reassuring CTG, resulting in cesarean section with umbilical cord arterial blood pH. (2) To find the false-positive indications of cesarean section due to CTG. Materials and Methods: This observational study was conducted in the Department of Obstetrics and Gynecology of SKIMS, Soura, from September 2020 to July 2022 over a period of 22 months. Women with a gestational age of more than 34 weeks with singleton pregnancy were included in the study. Those with CTG-documented fetal distress were subjected to umbilical cord arterial blood pH monitoring. Results: A total of 85 patients underwent cesarean sections in view of fetal distress documented by CTG, but only 45 neonates had actual distress as documented by umbilical cord blood sampling. Conclusion: Social and non-medical factors no doubt have caused an alarming rise in cesarean sections, but at the same time, there are some iatrogenic causes, namely CTG, which lead to the rise in the cesarean section rate due to false-positive indications. This has been further supported by the fact that the pH of the umbilical cord blood of neonates with intrapartum non-reassuring CTG does not correspond to fetal acidemia in all cases. Hence, a significant number of cesarean sections is being done for false-positive indications.

Efficiency of the Cerebroplacental Ratio in Identifying High-Risk Late-Term Pregnancies.

Background and Objectives: Over the last few years, great interest has arisen in the role of the cerebroplacental ratio (CPR) to identify low-risk pregnancies at higher risk of adverse pregnancy outcomes. This study aimed to assess the predictive capacity of the CPR for adverse perinatal outcomes in all uncomplicated singleton pregnancies attending an appointment at 40-42 weeks. Materials and Methods: This is a retrospective cohort study including all consecutive singleton pregnancies undergoing a routine prenatal care appointment after 40 weeks in three maternity units in Spain and the United Kingdom from January 2017 to December 2019. The primary outcome was adverse perinatal outcomes defined as stillbirth or neonatal death, cesarean section or instrumental delivery due to fetal distress during labor, umbilical arterial cord blood pH < 7.0, umbilical venous cord blood pH < 7.1, Apgar score at 5 min < 7, and admission to the neonatal unit. Logistic mixed models and ROC curve analyses were used to analyze the data. Results: A total of 3143 pregnancies were analyzed, including 537 (17.1%) with an adverse perinatal outcome. Maternal age (odds ratio (OR) 1.03, 95% confidence interval (CI) 1.01 to 1.04), body mass index (OR 1.04, 95% CI 1.03 to 1.06), racial origin (OR 2.80, 95% CI 1.90 to 4.12), parity (OR 0.36, 95% CI 0.29 to 0.45), and labor induction (OR 1.79, 95% CI 1.36 to 2.35) were significant predictors of adverse perinatal outcomes with an area under the ROC curve of 0.743 (95% CI 0.720 to 0.766). The addition of the CPR to the previous model did not improve performance. Additionally, the CPR alone achieved a detection rate of only 11.9% (95% CI 9.3 to 15) when using the 10th centile as the screen-positive cutoff. Conclusions: Our data on late-term unselected pregnancies suggest that the CPR is a poor predictor of adverse perinatal outcomes.

Real-time imaging as visual biofeedback in active second stage of labor among nulliparas: a randomized controlled trial

A prolonged second stage of labor increases the risk of severe perineal laceration, postpartum hemorrhage, operative delivery, and poor Apgar score. The second stage is longer in nulliparas. Maternal pushing during the second stage of labor is an important contributor to the involuntary expulsive force developed by uterine contraction to deliver the fetus. Preliminary data indicate that visual biofeedback during the active second stage hastens birth. This study aimed to evaluate if visual feedback focusing on the perineum reduced the length of the active second stage of labor in comparison with the control. A randomized controlled trial was conducted in the University Malaya Medical Centre from December 2021 to August 2022. Nulliparous women about to commence the active second stage, at term, with singleton gestation, reassuring fetal status, and no contraindication for vaginal delivery were randomized to live viewing of the maternal introitus (intervention) or maternal face (sham/placebo control) as visual biofeedback during their pushing. A video camera Bluetooth-linked to a tablet computer display screen was used; in the intervention arm, the camera was focused on the introitus, and in the control arm, on the maternal face. Participants were instructed to watch the display screen during their pushing. The primary outcomes were the intervention-to-delivery interval and maternal satisfaction with the pushing experience assessed using a 0-to-10 visual numerical rating scale. Secondary outcomes included mode of delivery, perineal injury, delivery blood loss, birthweight, umbilical cord arterial blood pH and base excess at birth, Apgar score at 1 and 5 minutes, and neonatal intensive care unit admission. Data were analyzed with the t test, Mann-Whitney U test, chi-square test, and Fisher exact test, as appropriate. A total of 230 women were randomized (115 to intervention and 115 to control arm). The active second stage duration (intervention-to-delivery interval) was a median (interquartile range) of 16 (11-23) and 17 (12-31) minutes (P=.289), and maternal satisfaction with the pushing experience was 9 (8-10) and 7 (6-7) (P<.001) for the intervention and control arm, respectively. Women randomized to the intervention arm were more likely to agree to recommend their management to a friend (88/115 [76.5%] vs 39/115 [33.9%]; relative risk, 2.26 [95% confidence interval, 1.72-2.97]; P<.001) and more likely to have less severe perineal injury (P=.018). Real-time viewing of the maternal introitus as visual biofeedback during pushing resulted in higher maternal satisfaction compared with the sham control of viewing the maternal face; however, the time to delivery was not significantly shortened.

Correlation of umbilical cord arterial blood pH with meconium stained liquor

Intrauterine passage of meconium may be due to fetal hypoxia, or it may simply indicate a normal gastrointestinal tract maturation. Umbilical cord blood pH is the best available criterion for detecting fetal hypoxia and making appropriate decisions about care after birth.To determine the correlation of umbilical cord arterial blood pH with meconium stained liquor and neonatal outcome. To determine whether the mode of delivery had any influence on the occurrence of acidemia in the neonate complicated with meconium stained liquor. A prospective observational study was conducted for a period of 6 months. Immediately following delivery in pregnancies complicated with meconium stained liquor, blood was drawn from the umbilical artery and sent for arterial blood gas (ABG) analysis. Neonatal outcome parameters and mode of delivery were then recorded in a pre-designed proforma. There was a statistically significant correlation between abnormal pH (acidosis) and thick meconium stained liquor. Neonatal outcome parameters like Apgar scores at 1 minute and 5 minutes, intravenous antibiotic administration, NICU admission and oxygen supplementation were statistically significant when correlated with the pH level.The degree of meconium thickness independently correlates with the composite adverse neonatal outcome. Cases with meconium stained liquor should be monitored vigorously with timely interventions and proper neonatal resuscitation, especially the ones with thick meconium stained liquor, in order to prevent adverse neonatal outcome.

Accuracy of intrapartum cardiotocography in identifying acidemia at birth by umbilical cord blood gasometry in high-risk pregnancies.

The aim of this study was to evaluate the accuracy of intrapartum cardiotocography in identifying acidemia at birth by umbilical cord blood gasometry in high-risk pregnancies. This was a retrospective cohort study of singleton high-risk parturients using intrapartum cardiotocography categories I, II, and III. The presence of fetal acidemia at birth was identified by the analysis of umbilical cord arterial blood pH (<7.1). Associations between variables were determined using the chi-square test and Kruskal-Wallis tests. We included 105 cases of cardiotocography category I, 20 cases of cardiotocography category II, and 10 cases of cardiotocography category III. cardiotocography category III had a higher prevalence of cesarean sections compared to cardiotocography category I (90.0 vs. 42.9%, p<0.006). Venous pH was higher in patients with cardiotocography category I compared to cardiotocography category III (7.32 vs. 7.23, p=0.036). Prevalence of neonatal intensive care unit (NICU) admission was lower in neonates of patients with cardiotocography category I compared to cardiotocography category III (3.8 vs. 30.0%, p=0.014). Prevalence of composite adverse outcomes was lower in neonates of patients with cardiotocography category I compared to cardiotocography category II (9.5 vs. 30.0%, p=0.022) and cardiotocography category III (9.5 vs. 60.0%, p=0.0004). cardiotocography categories II and III had low sensitivity (0.05 and 0.00, respectively) and high negative predictive value (NPV) (0.84 and 0.91, respectively) for identifying fetal acidemia at birth. The three categories of intrapartum cardiotocography showed high specificities (96.0, 99.0, and 99.0%, respectively). All three categories of intrapartum cardiotocography showed low sensitivity and high specificity for identifying acidemia at birth.

Accuracy of intrapartum cardiotocography in identifying fetal acidemia by umbilical cord blood analysis in low-risk pregnancies

The aim of this study was to evaluate the accuracy of intrapartum cardiotocography in identifying fetal acidemia by umbilical cord blood analysis in low-risk pregnancies.This is a retrospective cohort study of low-risk singleton pregnancies in labor after performing intrapartum cardiotocography categories I, II, and III. The presence of fetal acidemia at birth was identified by analyzing the pH of umbilical cord arterial blood (pH<7.1).No significant effect of the cardiotocography category on the arterial (p=0.543) and venous (p=0.770) pH of umbilical cord blood was observed. No significant association was observed between the cardiotocography category and the presence of fetal acidemia (p=0.706), 1-min Apgar score <7 (p=0.260), hospitalization in the neonatal intensive care unit (p=0.605), newborn death within the first 48 h, need for neonatal resuscitation (p=0.637), and adverse perinatal outcomes (p=0.373). Sensitivities of 62, 31, and 6.0%; positive predictive values of 11.0, 16.0, and 10.0%; and negative predictive values of 85, 89.0, and 87.0% were observed for cardiotocography categories I, II, and III, respectively.The three categories of intrapartum cardiotocography presented low sensitivities and high negative predictive values to identify fetal acidemia at birth in low-risk pregnancies.

Perinatal maternal characteristics predict a high risk of neonatal asphyxia: A multi-center retrospective cohort study in China.

ObjectiveThis study aimed to identify various perinatal maternal characteristics that contributed to neonatal asphyxia (NA) in term and late-preterm newborns based on the data obtained from a Chinese birth registry cohort and to establish an effective model for predicting a high risk of asphyxia.MethodWe retrospectively reviewed and analyzed the birth database from July 1, 2016, to June 30, 2017, in the main economically developed regions of China. Asphyxia was defined as an Apgar score <7 at 5 min post-delivery with umbilical cord arterial blood pH < 7.2 in the infant born after 34weeks. We compared the perinatal maternal characteristics of the newborns who developed asphyxia (NA group, n = 1,152) and those who did not (no NA group, n = 86,393). Candidate predictors of NA were analyzed using multivariable logistic regression. Subsequently, a prediction model was developed and validated by an independent test group.ResultOf the maternal characteristics, duration of PROM ≥ 48 h, a gestational week at birth <37, prolonged duration of labor, hypertensive disorder, nuchal cord, and birth weight <2,500 or ≥4,000 g, abnormal fetal heart rate, meconium-stained amniotic fluid, and placenta previa were included in the predicting model, which presented a good performance in external validation (c-statistic of 0.731).ConclusionOur model relied heavily on clinical predictors that may be determined before or during birth, and pregnant women at high risk of NA might be recognized earlier in pregnancy and childbirth using this methodology, allowing them to avoid being neglected and delayed. Future studies should be conducted to assess its usefulness.

Efficacy of fixed-dose phenylephrine bolus for treating post-spinal hypotension: Comparison between pre-eclamptics and normotensives.

Pre-eclamptic parturients may have an exaggerated response to vasopressors. This study compares the efficacy of a 50 μg fixed bolus of phenylephrine for treatment of post-spinal hypotension in pre-eclamptic versus normotensive parturients. After written informed consent and ethics committee approval, 30 normotensive and 30 pre-eclamptic parturients between 18 and 40 years with singleton term pregnancy about to undergo cesarean section (CS) under spinal anesthesia were included. Post-spinal hypotension was treated with a 50 μg fixed bolus of phenylephrine. The cumulative dose of phenylephrine, the number of boluses, and the median dose required to treat the first hypotensive episode, total number of hypotensive episodes, maternal side effects, neonatal appearance, pulse, grimace, activity, and respiration (APGAR) scores, and umbilical arterial cord blood pH were noted. Statistical analysis was done using Student's t-test, Mann-Whitney U-test, Chi-square test/Fisher's exact test as appropriate. A P <0.05 was considered significant. The cumulative dose and number of boluses of phenylephrine required to treat post-spinal hypotension were comparable. The median dose required to treat the first episode of post-spinal hypotension was also similar (p = 0.792). The time to develop the first hypotensive episode was significantly earlier for group N (p = 0.002). The efficacy of a single fixed bolus of 50 μg phenylephrine was similar in both groups (p = 1.000). Neonatal median APGAR scores at 1 min after birth were significantly higher for group N (p = 0.016). A fixed-dose bolus of 50 μg phenylephrine is safe and effective in treating post-spinal hypotension in pre-eclampsia. The efficacy of phenylephrine is comparable in pre-eclamptic and normotensive parturients.

Cardiotocography combined with ST analysis versus cardiotocography combined with fetal blood sampling in deliveries with abnormal CTG: a randomized trial.

The aim was to investigate if intrapartum monitoring with cardiotocography (CTG) in combination with ST analysis (STAN) results in an improved perinatal outcome. We performed a two-center randomized trial. 1013 women with term fetuses in cephalic presentation entered the trial. If a CTG showed intermediate or pathological abnormalities, they were offered fetal blood sampling (FBS) and inclusion if the pH value was above 7.25. They were randomized to either CTG + FBS or CTG + STAN. The primary outcome was neonatal metabolic acidosis, defined as umbilical cord arterial blood pH below 7.05, and base excess equal to or below -10. The secondary outcomes included operative vaginal delivery for fetal distress. The rate of metabolic acidosis was 0.8% in the CTG + FBS group and 1.5% in women in the CTG + STAN (P = 0.338). More women in the CTG + STAN group delivered by operative vaginal delivery (25.6% vs 33.5%, P = 0.006). Significantly fewer women in the CTG + STAN group had three to five (28.8% vs 11.0%, P = < 0.001) and six to ten fetal blood samples taken (3.4% vs 0.4%, P = < 0.001). CTG + STAN did not reduce the incidence of neonatal metabolic acidosis compared to CTG + FBS. CTG + STAN was, however, associated with an increased risk of operative vaginal delivery and a reduced use of FBS. If STAN is used for fetal surveillance, we recommend that it is combined with other methods, such as FBS, for confirmation of the need for operative delivery. gov ID: NCT01699646. Date of registration: October 4, 2012 (retrospectively registered). https://clinicaltrials.gov/ct2/show/NCT01699646?id=NCT01699646&draw=2&rank=1.

Umbilical cord arterial blood lactate dehydrogenase and pH as predictors of perinatal outcome in high-risk term pregnancies: A cohort study.

Birth asphyxia is a common cause of perinatal morbidity, mortality. To compare the efficacy of umbilical cord arterial blood lactate dehydrogenase (LDH) and pH as predictors of neonatal outcome in high-risk term pregnancies using receiver operating characteristic (ROC) curves. Present retrospective cohort study was conducted in the rural tertiary centre of Northern India over two years (January 2017-December 2018). Neonates delivered to 300 term (≥37 - ≤42 weeks) high-risk antenatal women were enrolled after fulfilling inclusion criteria. Immediately after delivery of a newborn by any mode, the segment of the umbilical cord (10 cm) was double clamped, cut, and arterial blood samples were taken for LDH and pH and were compared with neonatal outcome. Statistical analysis was done using SPSS 22.0 software. For all 300 neonates mean ± SD values of cord blood LDH and pH were 545.19 ± 391.93 U/L and 7.13 ± 0.15, respectively. High cord blood lactate and low pH values were significantly associated with adverse neonatal outcomes including neonatal resuscitation, NICU admission, complications and early neonatal deaths (p=0.000). The sensitivity, specificity and negative predictive value of cord blood LDH in the prediction of neonatal death was 100.00%, 53.17%, 100%, and pH was 93.75%, 53.17%, 99.34%, respectively. Cord blood lactate and pH help in the early prediction of neonatal outcomes, but cord blood lactate is a better predictor.

Association between Intrapartum Cardiotocography and Umbilical Cord Blood pH in Term Pregnancies: A Cross-sectional Study in a Tertiary Care Centre, Kolkata, India

Introduction: Labour, a physiological process for majority of foetuses, often acts as a challenge to foetal reserves causing foetal hypoxia. Foetal monitoring with intrapartum cardiotocography is an important tool to enable timely intervention to reduce adverse neonatal outcomes like postnatal cerebral palsy. Aim: To determine an association between cardiotocography tracing and umbilical artery cord blood pH in term pregnancies in labour where the influence of drugs and the presence of other comorbid medical/obstetric adverse outcomes have been ruled out. Materials and Methods: This cross-sectional, hospital-based, observational study involved singleton uncomplicated term pregnancies with a normal baseline cardiotocography and spontaneous labour onset and progression admitted to the labour ward of R.G. Kar Medical College and Hospital, Kolkata, West Bengal, India. Intrapartum continuous cardiotocography traces were recorded and those showing abnormal traces were documented and delivery expedited within two hours. Total of 90 such consecutive women were included in the study and umbilical arterial cord blood sample was taken for all these pregnancies immediate postpartum. Cardiotocography traces were then statistically compared with cord blood parameters and the findings were computed using Statistical Package for the Social Sciences (SPSS) software version 22.0. Results: Out of 90 participants the mean age was 24.21±3.43 years, most (43, 47.8%) of them were in between 21 to 25 years. Of the abnormal traces, 51 (56.7%) were NICE Category II (Suspicious) and 39 (43.3%) were NICE category III (pathological). Cord blood analysis revealed that 40% had a pH&lt;7, 44.4% had blood lactate levels above 6 mmol/L and another 47.7% had a base deficit ≥12 mmol/L. On crosstabulation and Chi-square analysis, these were all found to be statistically significant (p-value &lt;0.05). Abnormalities of Foetal Heart Rate (FHR) and baseline variability had higher Odds ratio of predicting umbilical artery acidemia with Odd’s ratio for baseline variability abnormality as high as 2.768. Conclusion: Although there has been a rising trend towards operative deliveries, the overall incidence of neonatal morbidity due to cerebral palsy is still on the rise. Cardiotocography can be a very important tool to identify neonatal acidosis in “at risk” foetuses and helps in timely intervention giving long term best outcomes.

A Study on Correlation of Umbilical Cord Arterial Blood pH with Perinatal Asphyxia &amp; Early Neonatal Outcome

Background: Perinatal asphyxia is one of the major causes of neonatal morbidity &amp; mortality. Asphyxia can damage almost every organ of neonate. Our purpose was to determine the correlation of cord blood pH with birth asphyxia &amp; early neonatal outcome. Subjects and Methods: A prospective study was conducted over a period of one year at STH Haldwani. We enrolled 108 term neonates with signs of fetal distress, thick MSL, non-reassuring NST &amp; there were subjected for estimation of umbilical cord blood pH, APGAR score, outcome looked were resuscitation needed, NICU admission, delay in feed &amp; encephalopathy (sarnat &amp; sarnat stage). Results: In our study, cord blood pH had significant correlation with perinatal asphyxia(R=-0.926). Area under ROC curved showed that mean pH &lt;7.1 (ROC=0.998) is very significant in predicting the adverse outcome. Conclusion: Cord blood pH is very sensitive and specific &amp; has good correlation in predicting the birth asphyxia &amp; adverse neonatal outcome. Measurement of cord blood pH is recommended in all the neonates with signs of fetal distress.

Double-balloon catheter versus dinoprostone insert for labour induction: a meta-analysis.

To assess the efficacy and safety of a double-balloon catheter versus dinoprostone insert for labour induction. PubMed, MEDLINE, Embase, ClinicalTrials.gov, and the Cochrane Central Register of Clinical Trials databases were searched from 1985 to April 2018. Randomized controlled trials that compared a double-balloon catheter and dinoprostone insert for cervical ripening were identified. Eligible study populations consisted of women with singleton pregnancies that had any indication for labour induction and were randomly assigned to undergo induction with a double-balloon catheter or dinoprostone insert. The main outcomes were incidence of vaginal delivery within 24h and caesarean section, and neonatal outcomes. Five randomized trials (603 women; 305 with a double-balloon catheter and 298 with a dinoprostone insert) were eligible for inclusion. No differences were observed between the two groups in terms of vaginal delivery within 24h [relative risk (RR) 1.21, 95% confidence interval (CI) 0.93-1.59] and incidence of caesarean section (RR 0.99, 95% CI 0.77-1.27). Compared with the double-balloon catheter, the dinoprostone insert was associated with a reduced need for oxytocin administration in the process of labour induction (RR 1.95, 95% CI 1.45-2.62). However, there was a higher incidence of excessive uterine activity (RR 0.17, 95% CI 0.06-0.54) and neonatal umbilical cord arterial blood pH < 7.1 (RR 0.36, 95% CI 0.15-0.84) in the dinoprostone insert group. This review showed that the efficacy of labour induction using both the double-balloon catheter and dinoprostone insert was similar. However, the double-balloon catheter seemed to be a safer method.

The Assessment of Association between Uterine Artery Pulsatility Index at 30-34 Week's Gestation and Adverse Perinatal Outcome.

Background:Given the high prevalence of adverse perinatal outcome in the developing countries and the association between uterine artery (UtA) blood flow and fetal status in the uterine, in the current study, we assess the association between UtA pulsatility index (UtA-PI) at 30–34 week's gestation and adverse perinatal outcome.Materials and Methods:This cohort study included 100 pregnant women at 30–34 weeks’ gestation. At baseline, UtA-PI was evaluated with color Doppler through abdominal ultrasound. Then, adverse perinatal outcomes including preterm labor, intrauterine fetal death, preeclampsia, low 5-min Apgar score (<7), low umbilical arterial cord blood pH, admitted to Intensive Care Unit in the first 3 days of birth, low birth weight, infant with low weight, death of newborns, cesarean section for respiratory distress, and meconial amniotic fluid were recorded. Ultimately, the collected data were analyzed using SPSS, version 20.Results:The presence of small-for-gestational-age fetuses indicated the highest prevalent adverse prenatal outcome with the incidence of 13.3% and 58.5%, respectively, among pregnancies with normal UtA-PI as well as those with high UtA-PI (P < 0.001). Overall, given that sensitivity and specificity of high UtA-PI were 37.5% and 73.3%, respectively, it could not properly predict adverse perinatal outcome (P = 0.360).Conclusion:According to the results, although the incidence of some of adverse perinatal outcomes in pregnant women with high UtA-PI was higher compared to those with normal UtA-PI, this factor alone cannot predict adverse perinatal outcome well. Therefore, this factor may predict these outcomes well, in the subgroups with high-risk pregnancies or with some blood factors or with pregnancy complications.

The comparison of umbilical cord arterial blood lactate and pH values for predicting short-term neonatal outcomes

ObjectiveCurrent clinical practice of assessing neonatal condition is based on evaluation of umbilical cord arterial blood pH value rather than lactate. However, evidence shows that lactate is direct and more predictive measurement than pH or at least of equal importance. This study is to assess and compare umbilical cord arterial lactate and pH values for predicting short-term neonatal outcomes. Materials and methodsA retrospective cohort study was conducted at the tertiary level hospital, were arterial umbilical cord blood sampling was collected according to the standard procedures. Neonatal morbidity was registered if at least one of the following conditions was noted: Apgar score at 1 min after delivery was 6 or lower, resuscitation performed, including assisted ventilation and requirement of admission to neonatal intensive care unit. Mothers–newborns pairs were allocated into two groups: newborns exposed to perinatal hypoxia (group 1) and observed as healthy newborns (group 2). Receiver operating characteristics curves (ROC) were generated to assess the predictive ability of pH and lactate for the short-term neonatal outcomes. Results901 neonates born at ≥37 weeks of gestation were included. Newborns exposed to perinatal hypoxia (group 1) encompassed 39 (4.3%) patients, and observed as healthy (group 2) – 862 (95.7%). Arterial umbilical cord blood pH in group 1 was 7.160 ± 0.126 as compared to 7.314 ± 0.083 in group 2; p < 0.001. Mean arterial lactate was significantly higher in group 1 than group 2 (6.423 ± 2.335 as compared to 3.600 ± 1.833; p < 0.001). The difference between areas under ROC curves representing pH and lactate was not significant (0.848 and 0.831 respectively; p = 0.6132). ConclusionUmbilical cord arterial lactate and pH predicted short-term neonatal outcomes with similar efficacies.

Perinatal factors associated with umbilical cord blood pH values

Objetivo: El análisis del pH de sangre arterial de cordón umbilical sigue siendo un criterio objetivo usado para determinar el estado metabólico del recién nacido tras el parto, y por tanto del bienestar fetal. El objetivo de este estudio fue identificar los factores perinatales asociados con los valores de sangre arterial de cordón umbilical.&lt;br /&gt;&lt;br /&gt;Material y métodos: Se realizó un estudio descriptivo y analítico entre Enero de 2010 y Enero de 2013 en un hospital de tercer nivel en el sur de España, con mujeres atendidas por parto. Los criterios de inclusión fueron: embarazo sin complicaciones y parto vaginal único, a término, con presentación cefálica. Las variables independientes con gran significación tras un análisis univariante fueron: edad, paridad, edad gestacional, analgesia epidural, plan de parto, episiotomía, duración de la primera fase del parto, y uso de oxitocina. Como variable dependiente se consideró: los valores de pH de sangre arterial de cordón umbilical (&amp;lt; = 7.24; &amp;gt; 7.24). El número total de mujeres fue de 165. El análisis estadístico se realizó mediante regresión logística múltiple. &lt;br /&gt;&lt;br /&gt;Resultados: La analgesia epidural y la edad gestacional mayor o igual a 41 semanas influyeron negativamente en el pH de cordón umbilical neonatal, mientras que haber presentado un plan de parto tuvo una influencia protectora.&lt;br /&gt;&lt;br /&gt;Conclusiones: Los hallazgos de este estudio proporcionan a los profesionales más evidencias sobre los elementos que pueden influenciar en el bienestar neonatal, con el fin de actuar en consecuencia, anticipándose a las situaciones de riesgo y aplicando una atención más eficaz. &lt;br /&gt;&lt;br /&gt;

Uterine artery pulsatility index at 30-34 weeks' gestation in the prediction of adverse perinatal outcome.

To investigate the potential value of uterine artery (UtA) Doppler at 30-34 weeks' gestation in the prediction of adverse perinatal outcome. This was a screening study in 30 780 singleton pregnancies at 30-34 weeks. UtA pulsatility index (UtA-PI) was measured and the values were converted to multiples of the median (MoM) after adjustment for variables relating to maternal characteristics and medical history that affect the measurements. Multivariable logistic regression analysis was used to determine if measuring UtA-PI improved the prediction of adverse perinatal outcome provided by screening with maternal characteristics, medical history and obstetric factors. The detection rate (DR) and false-positive rate (FPR) of screening by UtA-PI were estimated for stillbirth, Cesarean section for fetal distress, umbilical arterial cord blood pH ≤ 7.0 or umbilical venous cord blood pH ≤ 7.1 and 5-min Apgar score < 7. The incidence of adverse perinatal outcome was higher in small-for-gestational-age (SGA) fetuses than in non-SGA fetuses, but the majority of cases with each adverse outcome were in the non-SGA group, including about 70% of stillbirths and more than 80% with Cesarean section for fetal distress, low cord blood pH and low Apgar score. The performance of UtA-PI > 95(th) percentile in screening for each adverse outcome was poor with DR of 6-16% and a FPR of 5-6%. The DR of adverse outcome when screening by high UtA-PI was greater in pregnancies complicated by SGA than in non-SGA pregnancies; 24% vs 13% for stillbirth, 15% vs 5% for Cesarean section for fetal distress, 30% vs 9% for low cord blood pH and 20% vs 3% for low 5-min Apgar score, respectively. High UtA-PI at 30-34 weeks' gestation may be useful in the prediction of adverse perinatal outcome in pregnancies with a SGA fetus, however, in the absence of SGA, UtA-PI is a poor predictor of adverse outcome. Copyright © 2015 ISUOG. Published by John Wiley & Sons Ltd.

Biophysical and biochemical markers at 30-34 weeks' gestation in the prediction of adverse perinatal outcome

To investigate the potential value of biophysical and biochemical markers at 30-34 weeks' gestation in the prediction of adverse perinatal outcome. This was a screening study in 8268 singleton pregnancies at 30-34 weeks' gestation. Estimated fetal weight (EFW), uterine artery (UtA) pulsatility index (PI), umbilical artery (UA) PI, fetal middle cerebral artery (MCA) PI, mean arterial pressure (MAP), serum placental growth factor (PlGF) and soluble fms-like tyrosine kinase-1 (sFlt-1) were measured. The detection rate (DR) and false-positive rate (FPR) of screening by each biomarker were estimated for stillbirth, pre-eclampsia, delivery of small-for-gestational-age (SGA) neonate, Cesarean section for fetal distress before or during labor, umbilical arterial cord blood pH ≤7.0 or umbilical venous cord blood pH ≤7.1, 5-min Apgar score < 7 and admission to the neonatal unit (NNU). Multivariable regression analysis demonstrated that significant prediction of PE was provided by PlGF, sFlt-1, MAP and MCA-PI, with a DR of 98% for PE delivering < 37 weeks' gestation and 56% for those delivering ≥ 37 weeks, at a 10% FPR. Prediction of SGA was provided by EFW, PlGF, sFlt-1, UtA-PI, UA-PI and MCA-PI, with a DR of 88% for SGA delivering < 37 and 51% for those delivering ≥ 37 weeks' gestation, at a 10% FPR. Prediction of stillbirth was provided by EFW, UtA-PI and MCA-PI, with DR of 30% at 10% FPR. Prediction of Cesarean section for fetal distress before labor was provided by EFW, sFlt-1, UtA-PI and UA-PI, with a DR of 90% at a 10% FPR. Prediction of fetal distress in labor was provided by EFW and sFlt-1, with a DR of 16% at a 10% FPR. There were no significant differences from the normal outcome group in any of the biomarkers for low cord blood pH, low Apgar score or NNU admission for cases other than those with PE and/or SGA. At 30-34 weeks' gestation, biomarkers of impaired placentation and fetal hypoxemia provide good prediction of PE, SGA and fetal distress before labor, but poor or no prediction of stillbirth and adverse events in labor or after birth.

Biophysical and biochemical markers at 35-37 weeks' gestation in the prediction of adverse perinatal outcome.

To investigate the potential value of biophysical and biochemical markers at 35-37 weeks' gestation in the prediction of adverse perinatal outcome. This was a screening study in 3953 singleton pregnancies at 35-37 weeks' gestation. Estimated fetal weight (EFW), uterine artery pulsatility index (UtA-PI), umbilical artery (UA)-PI, fetal middle cerebral artery (MCA)-PI, mean arterial pressure (MAP), serum placental growth factor (PlGF) and soluble fms-like tyrosine kinase-1 (sFlt-1) were measured. The detection rate (DR) and false-positive rate (FPR) of screening by each biomarker were estimated for pre-eclampsia (PE), delivery of small-for-gestational-age (SGA) neonates, Cesarean section for fetal distress before or during labor, umbilical arterial cord blood pH ≤ 7.0 or umbilical venous cord blood pH ≤ 7.1, 5-min Apgar score < 7 and admission to the neonatal unit (NNU). Multivariable regression analysis demonstrated that significant prediction of PE was provided by PlGF, sFlt-1 and MAP, with a DR of 73% at a 10% FPR. Prediction of SGA was provided by EFW, PlGF and UtA-PI, with a DR of 63% at a 10% FPR. Prediction of Cesarean section for fetal distress before labor was provided by EFW and UA-PI with DR of 100% at 10% FPR. Prediction of fetal distress in labor was provided by EFW and sFlt-1, with a DR of 15% at a 10% FPR. There were no significant differences between those with a normal outcome and those with low cord blood pH, low Apgar score or NNU admission for any of the biomarkers assessed. At 35-37 weeks' gestation biomarkers of impaired placentation and fetal hypoxemia provide good prediction of PE, SGA and fetal distress before labor, but poor or no prediction of adverse events in labor or after birth.