Intrapartum Cardiotocography Research Articles

Monitoring Intrapartum Fetal Distress by Cardiotocography & Observe its Relation with Umbilical Cord Blood Sampling & Perinatal Outcome

Background: Cardiotocography (CTG) being a simple noninvasive tool has been used more frequently in recent decades to detect fetal distress & to reduce neonatal mortality &morbidity related to fetal hypoxia. On the other hand, umbilical cord blood gas can be used to detect fetal acidaemia due to fetal distress more accurately. This study aimed to correlate fetal monitoring findings by intrapartum CTG with umbilical cord blood pH & lactate level &test the ability of CTG to predict fetal distress & neonatal outcome. Materials and Methods: This prospective cross-sectional observational study was conducted in the Department of Obstetrics and Gynecology of Chittagong Medical College Hospital, Chattogram, Bangladesh for one year from July 2020 to June 2021. It included 80 term singleton pregnancies in active labour. Intrapartum CTG was taken and classified into normal, suspicious and pathological according to FIGO guidelines of CTG monitoring 2015. Mode of delivery, liquor colour, Apgar scores at 1 and 5 minutes, and admission to the neonatal intensive care unit (NICU), adverse neonatal outcomes were observed. Immediately after delivery of the baby 10 cm of the umbilical cord was clamped doubly and 2-3 ml of umbilical cord arterial blood was taken immediately in a pre-heparinized syringe and sent to a laboratory for assessment of pH and lactate to detect fetal acidosis. Antenatal CTG was correlated to neonatal outcomes and cord blood acidosis by statistical analysis. Results: In this study, 40.0% of the women had normal CTG, 38.8% had suspicious CTG, and 21.2% had pathological CTG. There was a significant worsening of neonatal outcomes across these three groups concerning depressed (<7) Apgar scores at 1 minute (40.6%, 80.6%, and 100%; P<0.001), depressed Apgar scores at 5 minutes (3.1%, 22.6%, and 47.1%; P<0.001), and admission to the NICU (9.4%, 38.6%, and 70.7%; P<0.001). When CTG was pathological or suspicious CTG delivery by LSCS was 5.33 times higher (RR: 5.33; 95% CI: 2.09 -13.63) compared to subjects with normal CTG. There was also a progressive worsening of cord blood pH (7.25±0.05, 7.20±0.06, and 7.13±0.09; P<0.001) and a progressive increase in lactate (3.66±1.01 mmol/l, 4.79±1.61 mmol/l, and 6.63±2.18 mmol/l; P<0.001). Conclusions: It should be concluded that pathological CTG which correlates intrapartum fetal hypoxia with cord blood acidaemia and adverse neonatal outcomes. As cardiotocography is a simple, cost-effective noninvasive tool it can be used to detect fetal distress in labour. Continues CTG monitoring can be offered or recommended in every labour room setting to detect fetal distress & early intervention to prevent neonatal morbidity & mortality.

Measuring the Impact of Cardiotocograph Decision Support Software on Neonatal Outcomes: A Propensity Score-Matched Observational Study

(Abstracted from Aust N Z J Obstet Gynaecol 2021;61:876–881) Continuous intrapartum cardiotocograph (CTG) monitoring during labor is thought to be a method to prevent fetal hypoxia-related birth injury. Although its use has been associated with fewer neonatal seizures, its impact on perinatal mortality or cerebral palsy is unclear.

IMPROVING PHASE-RECTIFIED SIGNAL AVERAGING FOR FETAL HEART RATE ANALYSIS.

Low umbilical artery pH is a marker for neonatal acidosis and is associated with an increased risk for neonatal complications. The phase-rectified signal averaging (PRSA) features have demonstrated superior discriminatory or diagnostic ability and good interpretability in many biomedical applications including fetal heart rate analysis. However, the performance of PRSA method is sensitive to values of the selected parameters which are usually either chosen based on a grid search or empirically in the literature. In this paper, we examine PRSA method through the lens of dynamical systems theory and reveal the intrinsic connection between state space reconstruction and PRSA. From this perspective, we then introduce a new feature that can better characterize dynamical systems comparing with PRSA. Our experimental results on an open-access intrapartum Cardiotocography database demonstrate that the proposed feature outperforms state-of-the-art PRSA features in pH-based fetal heart rate analysis.

Hazard and cumulative incidence of umbilical cord metabolic acidemia at birth in fetuses experiencing the second stage of labor and pathologic intrapartum fetal heart rate requiring expedited delivery

PurposeThe aim of the study was to determine the cause-specific hazard (CSH) and the cumulative incidence function (CIF) for umbilical cord metabolic acidemia at birth (MA; pH < 7.0 and/or BE le − 12 mmol/L) at delivery in patients experiencing the 2nd stage of labor (2STG), stratified for both FIGO-2015 pathologic intrapartum cardiotocography requiring expedited delivery (CTG_RED) and duration of 2nd stage of labor.Methods3459 pregnancies experiencing the 2nd stage of labor and delivering at the Division of Obstetrics and Prenatal Medicine, IRCCS Sant’Orsola-Malpighi Hospital, Bologna (Italy), were identified between 2018 and 2019. Survival analysis was used to assess CSH and CIF for MA, stratified for FIGO-2015 pathologic CTG and relevant covariates.ResultsFIGO-2015 pathological CTG with expedited operative delivery or urgent cesarean section within 10 or 20 min from diagnosis, respectively occurred in 282/3459 (8.20%). The rate of MA at delivery was 3.32% (115/3459). The spline of CSH for MA showed a direct correlation with the duration of 2STG always presenting higher values and greater slope in the presence of pathologic CTG, with plateau between 60 and 120 min and rapid increase after 120 min. The CIF at 180 min in the 2STG was 2.67% for nonpathological and 10.63% for pathological CTG_RED. Nulliparity, pathological CTG, and meconium-stained amniotic fluid resulted significant predictors of MA in our multivariable model.ConclusionThe risk for MA increases moderately across the 2STG with nonpathological CTG and quadruples with pathological CTG_RED. Adjustment for other predictors of MA including meconium-stained amniotic fluid and nulliparity reveals a significant hazard increase for MA associated with pathologic CTG_RED.

Intrapartum cardiotocography in pregnancies with and without fetal CHD.

Congenital heart defects (CHD) are the most common inherited abnormalities. Intrapartum cardiotocography (CTG) is still considered a "gold standard" during labor. However, there is a lack of evidence regarding the interpretation of intrapartum CTG in fetuses with CHD. Therefore, the study aimed to compare intrapartum CTG in normal fetuses and fetuses with CHD and describe the association between CTG and neonatal outcomes. The present study is a retrospective analysis of the CTG of 395 fetuses. There were three study groups: Group 1: 185 pregnancies with a prenatal diagnosis of CHD, Group 2: 132 high-risk pregnancies without CHD, and Group 3: 78 low-risk pregnancies without CHD. Abnormal CTG was present statistically OR=3.4 (95%CI: 1.61-6.95) more often in Group 1. The rate of the emergency CS was higher in this group OR=3 (95%CI: 1.3-3.1). Fetuses with CHD and abnormal CTG were more often scored≤7 Apgar, with no difference in acidemia. The multivariate regression model for Group 1 does not show clinical differences between Apgar scores or CTG assessment in neonatal acidemia prediction. CTG in fetuses with CHD should be interpreted individually according to the type of CHD and conduction abnormalities. Observed abnormalities in CTG are associated with the fetal heart defect itself. Preterm delivery and rapid cesarean delivery lead to a higher rate of neonatal complications. Health practitioners should consider this fact during decision-making regarding delivery in cases complicated with fetal cardiac problems.

Fetal and maternal outcomes of trial of Labour with uterine scar.

Objective: To ascertain the vaginal birth rate following the trial of uterine scar and its outcomes. Study Design: Cross-sectional Observational study. Setting: Department of Gynecology Bakhtawar Amin Trust Teaching Hospital Multan. Period: 6th August 2020 to 6th August 2021. Material &amp; Methods: After passing through selection criteria, all enrolled women underwent serial ultrasound including pelvis ultrasound to access scar thickness up to thirty-six gestation weeks. All women were evaluated for baseline investigations, clinical history, and underwent cardiotocography (CTG) which was then followed by a trial of labor (TOL). Women who experienced spontaneous labor after TOL were observed through partogram and intrapartum CTG. All maternal and fetal outcomes were observed. Results: Out of these 80 women, 51 (63.7%) had successfully given birth through the vaginal route while 29 (36.2%) underwent emergency CS following TOL. The majority of enrolled women, 62 (77.5%) had age less than 35 years, 45 (56.2%) had parity 1-4, and 74 (92.5%) had gestation age &gt;36 weeks. 3 (5.8%) women had a history of VBAC and all had parity &gt;4. Among the women with successful VBAC, the majority were younger than 35 years (88.2%), parity less than 4 (62.7%), and all were positive for previous successful VBAC. Postpartum hemorrhage was the most reported maternal complication (3.9%). Three (4.4%) experienced intra-uterine deaths which were the major fetal complications. Conclusion: Trial of vaginal birth following cesarean section could be a preferable option given its association with low fetal and maternal complications and considerable success rate.

Association of Intrapartum CTG with Fetomaternal Outcome

Objective: To determine the association of intrapartum CTG with fetomaternal outcome Material and Methods: A total number of 120 pregnant females who presented in the department of obstetrics and gynecology with labour pain were included in this cross-sectional analysis. A written informed consent was taken from all patients. The study was conducted in the department of Obstetrics &amp; Gynaecology at Islam Teaching Hospital, Sialkot from January, 2021 to September, 2021. At presentation in the labor room, 20 minutes CTG was performed and patients were divided into two groups, those having abnormal trace including suspicious and pathological trace (Group A) and normal cardiotocography (CTG) pattern (Group B). After that the patients were followed till delivery to determine the feto-maternal outcomes e.g. APGAR score, NICU admission, perinatal mortality and caesarean section rate. Results: The mean age was 26.9±4.12 years in group A and 27. 1 ± 3.9 years in group B (p-value 0.78). On comparison of maternal outcomes, caesarean section was done in 38 (63.3%) patients in group-A and in 17 (28.3%) patients in group-B (p-value &lt;0.0001).Regarding neonatal outcomes, NICU admission was needed in 9 (15%) patients in group A, versus in 4 (6.7%) patients in group B (p-value 0.14). Perinatal mortality occurred in 03 (5.0%) patients in group A and in no patient in group B (p-value 0.07). APGAR score at 5 minutes was &gt;7 in 46 (76.7%) patients in group A versus in 52 (86.7%) patients in group B (p-value 0.18). Conclusion: The intrapartum abnormal CTG cannot be used as the only tool to identify fetal hypoxia during labor. It may lead to increased caesarean section rate because of high false positive rate of abnormal CTG. Keywords: Cardiotocography, Fetal Distress, Cesarean section

Association of Intrapartum CTG with Fetomaternal Outcome

Objective: To determine the association of intrapartum CTG with fetomaternal outcome Material and Methods: A total number of 120 pregnant females who presented in the department of obstetrics and gynecology with labour pain were included in this cross-sectional analysis. A written informed consent was taken from all patients. The study was conducted in the department of Obstetrics &amp; Gynaecology at Islam Teaching Hospital, Sialkot from January, 2021 to September, 2021. At presentation in the labor room, 20 minutes CTG was performed and patients were divided into two groups, those having abnormal trace including suspicious and pathological trace (Group A) and normal cardiotocography (CTG) pattern (Group B). After that the patients were followed till delivery to determine the feto-maternal outcomes e.g. APGAR score, NICU admission, perinatal mortality and caesarean section rate. Results: The mean age was 26.9±4.12 years in group A and 27. 1 ± 3.9 years in group B (p-value 0.78). On comparison of maternal outcomes, caesarean section was done in 38 (63.3%) patients in group-A and in 17 (28.3%) patients in group-B (p-value &lt;0.0001).Regarding neonatal outcomes, NICU admission was needed in 9 (15%) patients in group A, versus in 4 (6.7%) patients in group B (p-value 0.14). Perinatal mortality occurred in 03 (5.0%) patients in group A and in no patient in group B (p-value 0.07). APGAR score at 5 minutes was &gt;7 in 46 (76.7%) patients in group A versus in 52 (86.7%) patients in group B (p-value 0.18). Conclusion: The intrapartum abnormal CTG cannot be used as the only tool to identify fetal hypoxia during labor. It may lead to increased caesarean section rate because of high false positive rate of abnormal CTG. Keywords: Cardiotocography, Fetal Distress, Cesarean section

Cardiotocography and Clinical Risk Factors in Early Term Labor: A Retrospective Cohort Study Using Computerized Analysis With Oxford System.

ObjectiveThe role of cardiotocography (CTG) in fetal risk assessment around the beginning of term labor is controversial. We used routinely collected clinical data in a large tertiary hospital to investigate whether infants with “severe compromise” at birth exhibited fetal heart rate abnormalities in their first-hour CTGs and/or other clinical risks, recorded as per routine care.Materials and MethodsRetrospective data from 27,927 parturitions (single UK tertiary site, 2001–2010) were analyzed. Cases were included if the pregnancy was singleton, ≥36 weeks' gestation, cephalic presentation, and if they had routine intrapartum CTG as per clinical care. Cases with congenital abnormalities, planned cesarean section (CS), or CS for reasons other than “presumed fetal compromise” were excluded. We analyzed first-hour intrapartum CTG recordings, using intrapartum Oxford System (OxSys) computer-based algorithms. To reflect the effect of routine clinical care, the data was stratified into three exclusive groups: infants delivered by CS for “presumed fetal compromise” within 2 h of starting the CTG (Emergency CS, n = 113); between 2 and 5 h of starting the CTG (Urgent CS, n = 203); and the rest of deliveries (Others, n = 27,611). First-hour CTG and clinical characteristics were compared between the groups, sub-divided to those with and without severe compromise: a composite outcome of stillbirth, neonatal death, neonatal seizures, encephalopathy, resuscitation followed by ≥48 h in neonatal intensive care unit. Two-sample t-test, X2 test, and Fisher's exact test were used for analysis.ResultsCompared to babies without severe compromise, those with compromise had significantly higher proportion of cases with baseline fetal heart rate ≥150 bpm; non-reactive trace; reduced long-term and short-term variability; decelerative capacity; and no accelerations in the first-hour CTG across all groups. Prolonged decelerations(≥3 min) were also more common. Thick meconium and small for gestational age were consistently more common in compromised infants across all groups. There was more often thick meconium, maternal fever ≥38 C, sentinel events, and other clinical risk factors in the Emergency CS and Urgent CS compared to the Others group.ConclusionA proportion of infants born with severe compromise had significantly different first-hour CTG features and clinical risk factors.

Implementation of a revised classification for intrapartum fetal heart rate monitoring and association to birth outcome: Anational cohort study.

A revised intrapartum cardiotocography (CTG) classification was introduced in Sweden in 2017. The aims of the revision were to adapt to the international guideline published in 2015 and to adjust the classification of CTG patterns to current evidence regarding intrapartum fetal physiology. This study aimed to investigate adverse neonatal outcomes before and after implementation of the revised CTG classification. A before-and-after design was used. Cohort I (n=160210) included births from June 1, 2014 through May 31, 2016 using the former CTG classification, and cohort II (n=166558) included births from June 1, 2018 through May 31, 2020 with the revised classification. Data were collected from the Swedish Pregnancy and Neonatal Registers. The primary outcome was moderate to severe neonatal hypoxic ischemic encephalopathy (HIE 2-3). Secondary outcomes were birth acidemia (umbilical artery pH <7.05 and base excess < -12mmol/L or pH <7.00), A-criteria for neonatal hypothermia treatment, 5-min Apgar scores <4 and <7, neonatal seizures, meconium aspiration, neonatal mortality and delivery mode. Logistic regression was used (period II vs period I), and results are presented as adjusted odds ratios (aORs) with 95% confidence intervals (95% CIs). There were no statistically significant differences in HIE 2-3 (aOR 1.27; 95% CI 0.97-1.66), proportion of neonates meeting A-criteria for hypothermia treatment (aOR 0.96; 95% CI 0.89-1.04) or neonatal mortality (aOR 0.68; 95% CI 0.39-1.18) between the cohorts. Birth acidemia (aOR 1.36; 95% CI 1.25-1.48), 5-min Apgar scores <7 (aOR 1.27; 95% CI 1.18-1.36) and <4 (aOR 1.40; 95% CI 1.17-1.66) occurred more often in cohort II. The absolute risk difference for HIE 2-3 was 0.02% (95% CI 0.00-0.04). Operative delivery (vacuum or cesarean) rates were lower in cohort II (aOR 0.82; 95% CI 0.80-0.85 and aOR 0.94; 95% CI 0.91-0.97, respectively). Although not statistically significant, a small increase in the incidence of HIE 2-3 after implementation of the revised CTG classification cannot be excluded. Operative deliveries were fewer but incidences of acidemia and low Apgar scores were higher in the latter cohort. This warrants further in-depth analyses before a full re-evaluation of the revised classification can be made.

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.

Intrapartum cardiotocographic monitoring and its correlation with neonatal outcome.

Despite the advancements in perinatal care in past decades, perinatal asphyxia remains a serious problem leading to significant perinatal morbidity and mortality. Therefore, foetal monitoring during the intrapartum period is of paramount importance. Among various methods of fetal monitoring, cardiotocography is a form of electronic foetal monitoring in which there is simultaneous recording of foetal heart rate and uterine contractions. This cross-sectional observational study was done in the labour room and neonatal intensive care unit (NICU) of a teaching Municipal Hospital in North India including 500 pregnant women of age group 18-45 years with singeleton fetus of gestation ≥36 weeks without any known congenital anomaly. Intrapartum cardiotocography (CTG) for 20 minutes was done within 12 hours prior to delivery and babies born to them were observed for birth asphyxia as Apgar score <7 at 1 minute as per using APGAR score less than 7 at 1 minute as per south east asia regional neonatal perinatal database (SEAR-NPD), world health organization (WHO) working definition. CTG tracing was normal/reassuring in 92% of pregnant women, nonreassuring in 7% and was abnormal in only 1%. In patients with abnormal and nonreassuring CTG, delivery by lower segment cesarian section (LSCS) was significantly high (P < .0001). APGAR scoring was done at 1 minute and 5 minutes of life, it was found that 4% babies were having score less than 7 at 1 minute with incidence of birth asphyxia 40 per 1,000 live births Neonatal seizure was significantly more in nonreassuring and abnormal CTG group (P value <.0001). Abnormal CTG tracings result in higher incidence of operative interventions for deliveries. Abnormal CTG pattern during intrapartum CTG has high specificity and negative predictive value but has low sensitivity and positive predictive value for detection of birth asphyxia and need for NICU admission.

Combination of XGBoost Analysis and Rule-Based Method for Intrapartum Cardiotocograph Classification

PurposeThe two major components of a cardiotocograph (CTG) are uterine contraction (UC) and fetal heart rate (FHR) signals. CTG has been widely used to monitor fetal well-being in the past 50 years. The guideline provided by the National Institute of Child Health and Human Development (NICHD) classifies CTG patterns into three categories (I, II, and III) in evaluating the status of a fetus. However, manual interpretation of CTG is time-consuming and is subjected to inter-personal bias.MethodsIn this study, we combined the rule-based method and eXtreme Gradient Boosting (XGBoost) analysis in classifying CTG patterns. Because of the persistent controversies about the Category II of NICHD, XGBoost analysis was used to classify it into IIa and IIb. A total of 68 pregnant women were enrolled in this study.ResultsThree categories (I, II, and III) were consistent in both manual interpretation by clinicians and our algorithm across all categories, and the average Kappa was about 0.72. The probability of fetal distress (FD) was 28.8% and 71.2% in the categories IIa and IIb, respectively.ConclusionThese findings show the proposed method has the potential to provide a clinical assistant tool to monitor fetal well-being and has high potential to be an assistive and warning system to reduce the burden of medical staff.

Time to reconsider: Have the 2015 FIGO and 2017 Swedish intrapartum cardiotocogram classifications led us from Charybdis to Scylla?

In 2015, FIGO revised the 1987 intrapartum cardiotocography (CTG) classification (FIGO1987). A less radical FIGO2015 version was introduced in Sweden 2017 (SWE2017). Now, post hoc simulation studies show that FIGO2015 and SWE2017 are less reliable than (a modified) FIGO1987. FIGO2015shows significantly better interobserver agreement for normal CTG traces than FIGO1987, but significantly worse for pathological traces. Agreements between templates are moderate to good, but different classifications of mainly variable decelerations and tachycardia cause significant heterogeneities. FIGO2015shows insufficient sensitivity to identify fetal acidemia compared with FIGO1987. In connection with fetal electrocardiogram ST analysis, one study showed no template was superior in identifying fetal acidemia, but in a series of only academia, FIGO1987had significantly higher sensitivity than FIGO2015 (73% vs. 43%) and set of an alarm for fetal acidemia considerably earlier. With SWE2017, operative interventions declined significantly in Sweden but several adverse neonatal outcomes increased significantly. It remains to investigate the development with FIGO2015.

Absence of fetal heart rate cycling on the intrapartum cardiotocograph (CTG) is associated with intrapartum pyrexia and lower Apgar scores

Background Cycling consists of alternating periods of reduced and normal fetal heart variability, reflecting changes in fetal behavioral states. Occurrence of active and quiet sleep cycles is considered to be a hallmark of fetal autonomic nervous system integrity, demonstrating healthy interaction between the parasympathetic and sympathetic nervous systems. Cycling is an overlooked feature in most international cardiotocography (CTG) guidelines. The authors tested the hypothesis that fetuses showing no cycling in the intrapartum period have poorer outcomes. Aim To investigate whether the absence of cycling at the commencement of intrapartum fetal monitoring is associated with poorer neonatal outcomes (umbilical arterial cord pH, Apgar scores and neonatal unit admission). Methods Analysis of a database of sequentially acquired intrapartum CTG traces from a single center. Only cases of singleton pregnancies over 36 weeks gestation in cephalic presentation with recorded umbilical artery cord pH were considered. Neonatal outcomes were assessed based on umbilical cord artery pH, Apgar ≤7 at 5 min and unexpected admission to the neonatal unit. Intrapartum pyrexia, presence of meconium-stained amniotic fluid and mode of delivery were also recorded. Results A total of 684 cases were analyzed. Absence of cycling from the beginning of the intrapartum CTG recording was noted in 5% of cases. Cases with no cycling were more likely to have maternal pyrexia (≥37.8 °C) (p = .006) and Apgars ≤7 at 5 min (p = .04). There was an association between increasing baseline fetal heart rate and the proportion of cases with no cycling. There was no significant difference between the two groups with regard to the mode of delivery or umbilical cord arterial pH <7.05 (p = .53). Conclusion Absence of cycling is associated with intrapartum maternal pyrexia and fetuses with the absence of cycling are more likely to have poorer perinatal outcomes measured by Apgar ≤ 7 at 5 min, despite no association with fetal acidosis. Results from this research were presented at the XXVI European Congress of Perinatal Medicine in September 2018.

Does training in intrapartum fetal monitoring actually work?

Intrapartum cardiotocograph (CTG) monitoring is widely used in the provision of maternity care in high-income countries. First introducedintoclinicalpractice in the 1960s, it was anticipated thattheuse ofCTG monitoring in labour would dramatically reduce theperinatal mortalityrate and prevent long term neurological injury, whilealsoreducing the caesarean section rate(Paul & Hon, 1970, Obstetrics & Gynaecology 35(2), 161-9).

Crowdsourcing citation-screening in a mixed-studies systematic review: a feasibility study

BackgroundCrowdsourcing engages the help of large numbers of people in tasks, activities or projects, usually via the internet. One application of crowdsourcing is the screening of citations for inclusion in a systematic review. There is evidence that a ‘Crowd’ of non-specialists can reliably identify quantitative studies, such as randomized controlled trials, through the assessment of study titles and abstracts. In this feasibility study, we investigated crowd performance of an online, topic-based citation-screening task, assessing titles and abstracts for inclusion in a single mixed-studies systematic review.MethodsThis study was embedded within a mixed studies systematic review of maternity care, exploring the effects of training healthcare professionals in intrapartum cardiotocography. Citation-screening was undertaken via Cochrane Crowd, an online citizen science platform enabling volunteers to contribute to a range of tasks identifying evidence in health and healthcare. Contributors were recruited from users registered with Cochrane Crowd. Following completion of task-specific online training, the crowd and the review team independently screened 9546 titles and abstracts. The screening task was subsequently repeated with a new crowd following minor changes to the crowd agreement algorithm based on findings from the first screening task. We assessed the crowd decisions against the review team categorizations (the ‘gold standard’), measuring sensitivity, specificity, time and task engagement.ResultsSeventy-eight crowd contributors completed the first screening task. Sensitivity (the crowd’s ability to correctly identify studies included within the review) was 84% (N = 42/50), and specificity (the crowd’s ability to correctly identify excluded studies) was 99% (N = 9373/9493). Task completion was 33 h for the crowd and 410 h for the review team; mean time to classify each record was 6.06 s for each crowd participant and 3.96 s for review team members. Replicating this task with 85 new contributors and an altered agreement algorithm found 94% sensitivity (N = 48/50) and 98% specificity (N = 9348/9493). Contributors reported positive experiences of the task.ConclusionIt might be feasible to recruit and train a crowd to accurately perform topic-based citation-screening for mixed studies systematic reviews, though resource expended on the necessary customised training required should be factored in. In the face of long review production times, crowd screening may enable a more time-efficient conduct of reviews, with minimal reduction of citation-screening accuracy, but further research is needed.

Quantification of Posterior Risk Related to Intrapartum FIGO 2015 Criteria for Cardiotocography in the Second Stage of Labor

Introduction: Intrapartum cardiotocography (CTG) was used for several decades to detect a stressed fetus so that delivery can be expedited to prevent birth asphyxia. The main aim of the study was to calculate the risk of neonatal acidemia (pH ≤ 7.10) according to duration of the 2nd stage of labor and occurrence of the International Federation of Gynecology and Obstetrics (FIGO) 2015 CTG classification parameters. Materials and Methods: This was a retrospective case-control study on 552 pregnancies receiving continuous CTG monitoring in labor and immediate hemogasanalysis at birth. Cases with umbilical artery (UA) pH ≤ 7.10 and controls with UA pH ≥ 7.10 were matched for parity and gestational age at delivery, with ratio 1:5. Logistic regression analysis, adjusted for the expected risk in the general population, was used to calculate the baseline risk of UA pH ≤ 7.10 in the absence of any CTG pathological feature and those associated with pathological CTG patterns occurring in the 2nd stage according to FIGO 2015. Results: Seventy-three cases and 387 controls reached 2nd stage and were included in the analysis. For those reaching 2nd stage, the mean adjusted risk of acidemia associated with nonpathological CTG was 1.6%. Stratification of risk according to duration of the 2nd stage yielded risks of neonatal acidemia of 1.23, 2.08, 5.81, and 15.22% at 30, 60, 120, and 180 min, respectively. Bradycardia >10 min was associated with risk of neonatal acidemia of 9.9 and 15.8% for 2nd-stage durations of 30 and 60 min, respectively. Risks associated with 1 prolonged deceleration >5 min were 6.80, 11.08, 27.0, and 51.0% at 30, 60, 120, and 180 min, respectively. Repetitive late or prolonged decelerations >30 min were associated with risk of neonatal acidemia of 2.43, 4.14, 11.17, and 26.45% at 30, 60, 120, and 180 min, respectively. Conclusion: The risk of neonatal acidemia is directly proportional to duration of the 2nd stage, irrespective of the presence of CTG abnormalities, increasing 12-fold (1.2–15.3%) from 30 to 180 min. Occurrence of FIGO 2015 pathological CTG patterns showed a decreasing impact from bradycardia >10 min to decelerations >5 min, recurrent later or prolonged decelerations >30 min, and nonpathological CTG.

Training in the use of intrapartum electronic fetal monitoring with cardiotocography: systematic review and meta‐analysis

BackgroundSub‐optimal classification, interpretation and response to intrapartum electronic fetal monitoring using cardiotocography are known problems. Training is often recommended as a solution, but there is lack of clarity about the effects of training and which type of training works best.ObjectivesSystematic review of the effects of training healthcare professionals in intrapartum cardiotocography (PROSPERO protocol: CRD42017064525).Search strategyCENTRAL, Cochrane Library, MEDLINE, EMBASE, PsycINFO, British Nursing Database, CINAHL, ERIC, Scopus, Web of Science, ProQuest, grey literature and ongoing clinical trials were searched.Selection criteriaPrimary studies that reported impact of training healthcare professionals in intrapartum cardiotocography. Title/abstract, full‐text screening and quality assessment were conducted in duplicate.Data collection and analysisData were synthesised both narratively and using meta‐analysis. Risk of bias and overall quality were assessed with the Mixed Methods Appraisal Tool and GRADE.Main resultsSixty‐four studies were included. Overall, training and reporting were heterogeneous, the outcomes evaluated varied widely and study quality was low. Five randomised controlled trials reported that training improved knowledge of maternity professionals compared with no training, but evidence was of low quality. Evidence for the impact of cardiotocography training on neonatal and maternal outcomes was limited, showed inconsistent effects, and was of low overall quality. Evidence for the optimal content and method of delivery of training was very limited.ConclusionsGiven the scale of harm and litigation claims associated with electronic fetal monitoring, the evidence‐base for training requires improvement. It should address intervention design, evaluation of clinical outcomes and system‐wide contexts of sub‐optimal practice.Tweetable abstractTraining in fetal monitoring: systematic review finds little evidence of impact on neonatal outcomes.

Non-invasive Fetal Electrocardiography for Intrapartum Cardiotocography.

Fetal monitoring is important to diagnose complications that can occur during pregnancy. If detected timely, these complications might be resolved before they lead to irreversible damage. Current fetal monitoring mainly relies on cardiotocography, the simultaneous registration of fetal heart rate and uterine activity. Unfortunately, the technology to obtain the cardiotocogram has limitations. In current clinical practice the fetal heart rate is obtained via either an invasive scalp electrode, that poses risks and can only be applied during labor and after rupture of the fetal membranes, or via non-invasive Doppler ultrasound technology that is inaccurate and suffers from loss of signal, in particular in women with high body mass, during motion, or in preterm pregnancies. In this study, transabdominal electrophysiological measurements are exploited to provide fetal heart rate non-invasively and in a more reliable manner than Doppler ultrasound. The performance of the fetal heart rate detection is determined by comparing the fetal heart rate to that obtained with an invasive scalp electrode during intrapartum monitoring. The performance is gauged by comparing it to performances mentioned in literature on Doppler ultrasound and on two commercially-available devices that are also based on transabdominal fetal electrocardiography.