Article Text
PDF
Abstract
Introduction Gentle assisted pushing (GAP) is an innovative method of applying gentle, steady pressure to a woman’s uterine fundus during second stage of labour. This randomised trial evaluated GAP in an upright position, compared with upright position alone or routine practice (recumbent posture).
Methods An open-label, hospital-based, randomised trial was conducted in Eastern Cape, South Africa. Randomisation occurred following at least 15 min in second stage of labour. Participants were randomly assigned (1:1:1) using computer-generated block randomisation of variable size using opaque, sealed, numbered envelopes. Primary analysis was intention to treat. Participants were healthy, nulliparous, consenting women with a singleton pregnancy in cephalic presentation where vaginal birth was anticipated. The primary outcome was mean time from randomisation to birth.
Results 1158 participants were randomly allocated to GAP (n=388), upright position (n=386) and routine practice (n=384), with no loss to follow-up. Baseline characteristics were largely similar. In the experimental arm, GAP was applied a median of two times (IQR 1.0–3.0). Women in upright position alone spent a median of 6 min (IQR 3.0–10.0) upright. Mean duration from randomisation to birth was not different across groups (mean (SD) duration: 24.1 (34.9) min in GAP group, 24.6 (30.5) min in upright group, 25.0 (39.3) min in routine practice group). There were no differences in secondary outcomes, except that at two sites maternal discomfort was greater for both GAP and upright position compared with routine practice; at the other sites there were no differences.
Conclusion No benefit was identified from GAP in the second stage; some women found the position uncomfortable. The use of fundal pressure should be limited to further research to determine techniques or settings in which it can safely assist vaginal birth. Women should be encouraged to assume the position they find most comfortable.
Trial registration number PACTR201502001034448.
- obstetrics
This is an open access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/
Statistics from Altmetric.com
Key questions
What is already known?
Nine trials have been conducted previously on fundal pressure during the second stage of labour compared with no treatment—five trials (3057 women) of manual fundal pressure and four trials (891 women) of fundal pressure by means of an inflatable belt versus no fundal pressure. Most trials had design limitations, and none were able to blind women or staff to allocation.
There is insufficient evidence to draw conclusions on the beneficial or harmful effects of fundal pressure (either manually or by inflatable belt) for mother or baby.
Because of current widespread use of fundal pressure in clinical settings, and the potential for use in settings where other methods of assisted birth are not available, further good quality trials are needed to guide practice.
What are the new findings?
This trial showed no clear benefit from a new technique of a gentle, controlled form of manual fundal pressure, nor of upright position alone in the second stage of labour. Some women found the upright position (with or without fundal pressure) uncomfortable, although findings were mixed.
What do the new findings imply?
There is insufficient evidence of effectiveness or safety to support the use of fundal pressure, except in the context of research designed to determine whether specific techniques of fundal pressure in certain clinical situations may be beneficial and safe. Given the lack of clear benefits of specific postures in the second stage of labour, women may be encouraged to use the posture they find most comfortable.
Background
Applying manual fundal pressure to expedite birth was originally described by Samuel Kristeller in the 1870s and was known as the Kristeller manoeuvre. While techniques vary, fundal pressure has been described as the application of pressure by the birth attendant to the uppermost part of a woman’s uterus, directed towards the birth canal, in an attempt to assist spontaneous vaginal birth.1 Under controlled conditions, this technique has been shown to increase intrauterine pressure.2 The Cochrane review on fundal pressure during the second stage of labour identified five trials (3057 women) of manual fundal pressure and four trials (891 women) of fundal pressure applied by an inflatable belt.1 The review concluded that there is currently insufficient evidence to draw conclusions on the beneficial or harmful effects of fundal pressure and further good quality trials are needed.
Despite the lack of evidence fundal pressure is used in many countries.3–6 It has been both recommended and condemned as a strategy for assisting birth, particularly for shoulder dystocia management.7 8 It is often applied routinely, or when there is evidence of prolonged second stage of labour, a need to expedite birth (eg, fetal distress), or for maternal medical conditions where prolonged pushing is contraindicated.1 It is also used to assist birth at Caesarean section. It is difficult to quantify or control the amount of force used—it can vary from gentle pressure with one hand, to vigorous force applied using the attendant’s whole weight. Use of rapid thrusting movements may cause sharp rises in intrauterine pressure and increase the risk of maternal and neonatal injury.
Reliable evidence on the benefits and/or harms of fundal pressure applied in a safe and controlled manner can have important implications for clinical practice. We therefore developed and evaluated the gentle assisted pushing (GAP) technique, a gentle fundal pressure manoeuvre performed by a skilled, trained birth attendant (midwife or doctor) with the woman in the upright position. In 2013, we conducted a two-arm pilot randomised controlled trial (GAP vs routine practice) of 120 healthy nulliparous women in South Africa with singleton, cephalic pregnancies using this technique. The pilot study demonstrated GAP is feasible in our clinical setting and further investigation of safety and efficacy was warranted.9
In assessing GAP’s effect on duration of labour and other outcomes, it is important to account for the effect of upright position in the second stage of labour, which may facilitate vaginal birth by enabling the mother to bear down more efficiently, as well as tilting the pelvis to a more favourable orientation. A Cochrane review has shown that in women without epidural anaesthesia, the upright position might reduce duration of second stage (though not in the trials with lower risk of bias) and reduce rates of assisted birth, episiotomy and abnormal fetal heart rate patterns, while second-degree perineal tears and estimated blood loss over 500 mL may increase.10 A recent randomised trial in women with low-dose epidural analgesia found that spontaneous vaginal birth was less frequent with upright posture.11 The objective of this trial was to compare GAP in an upright position to upright position alone, or routine practice (supine/recumbent position) on duration of second stage of labour and neonatal and maternal outcomes.
Methods
The study protocol was registered with the Pan African Clinical Trials Registry (PACTR201502001034448), and published previously (online supplementary appendix 1).12 The trial was conducted in accordance with Good Clinical Practice (GCP) standards and monitored by a data and safety monitoring board (DSMB), and is reported according to Consolidated Standards of Reporting Trials guidance (online supplementary appendix 2).13
Supplemental material
Supplemental material
Study design and participants
The GAP study was a multicentre, randomised, open-label clinical trial with three parallel arms. The study was conducted at four sites across three hospitals in the Eastern Cape, South Africa. Frere Maternity Hospital (midwife-led obstetric unit and obstetrician-led care unit at Frere were separate study sites) and Cecilia Makiwane Hospital are tertiary hospitals in East London, South Africa (with 6840 and 4800 births annually, respectively). Butterworth Hospital is a nearby district hospital with 4800 births annually.
Women were informed about the trial in the antenatal period or latent phase. Eligible women were nulliparous, at least 18 years of age, at 35 or more weeks of gestation with a singleton, cephalic pregnancy, in whom a vaginal birth was anticipated. Women with chronic medical conditions (including heart disease, epilepsy, hypertension, diabetes mellitus and renal disease) and obstetric complications (including hypertensive disorders of pregnancy, cephalopelvic disproportion, antepartum haemorrhage, intrauterine growth restriction and fetal distress) were not eligible. If eligible, the informed consent process was initiated.
Randomisation and allocation
Consenting women who were undelivered following at least 15 min of expulsive efforts in the second stage of labour were randomised by research staff by opening the next sequentially numbered, sealed, opaque envelope containing the participant’s group assignment. The randomisation sequence and envelopes were prepared by the WHO data manager, using a computer-generated random sequence in balanced blocks of variable size, in a ratio of 1:1:1. It was not possible to blind participants and staff to allocation after randomisation.
Participants were randomly allocated to one of the three intervention groups: GAP (in upright position); upright position only; and routine practice (recumbent/supine position). Other than the allocated intervention, routine clinical practice was otherwise used in all arms, including fetal heart monitoring and routine postpartum oxytocin use. Women were encouraged to adopt the allocated position, however at any stage of labour, change in position, oxytocin administration, instrumental birth or caesarean section could be used, as per decisions of the responsible clinician. It was anticipated that some women might find their allocated position uncomfortable. Participants were specifically assured of their right to decline or to withdraw from the study for any reason, and that it would not affect the medical care to which she was entitled. There was no payment for participation.
Arm 1—GAP
The GAP method was specifically developed to avoid vigorous fundal pressure. The woman is assisted to assume an upright kneeling or squatting position on the bed. The trained birth attendant (midwife or doctor) kneels on the bed or stands behind the woman, wraps her arms around her (passing below her axillae) and places both open palms, overlapping, on the uterine fundus. Steady (firm yet gentle) pressure is applied in the long axis of the uterus during contractions for a maximum of 30 s, with at least 30 s rest before the next application. The relative positions of woman and attendant ensure that excessive force cannot be used. Labour ward and study staff at all sites underwent initial and refresher training in applying GAP, using standardised training with video demonstrations and simulation. An example of the GAP technique is available in online supplementary appendix 3.
Supplemental material
Arm 2—Upright position
Participating women were encouraged to assume an upright position (kneeling, squatting or crouching) during the second stage of labour, with no fundal pressure. When the baby’s head crowned, the birth attendant could choose to move the woman to a recumbent position for the birth, if required.
Arm 3—Routine practice
The current position as practised in the participating sites was used (recumbent/supine). If women remained undelivered 30 min after randomisation, fundal pressure or changes in position could be used according to routine local practice. Additional procedures or treatments at the discretion of the attendant were recorded in the participants’ records.
Electronic fetal heart rate monitoring was not routinely used in uncomplicated second-stage pregnancies in the participating hospitals. The fetal monitoring protocol was for auscultation of the fetal heart rate after each contraction. If electronic monitoring was used, the GAP procedure does not interfere as the monitor is positioned on the anterior aspect of the uterus while pressure is applied to the fundal aspect.
Study outcomes
The primary outcome was defined as mean time (minutes) from randomisation to birth. Secondary outcomes were: no spontaneous birth within 15 min of randomisation, operative birth (ie, birth by vacuum, forceps or caesarean section) and the use of episiotomy or perineal trauma (defined as second or higher degree perineal tear). Neonatal outcomes included: cord blood pH <7.2 or lactate ≥8 mmol/L (measured using neonatal intensive care unit blood gas analysers, and/or handheld strip lactate tests), Apgar score less than 7 at 5 min, neonatal injury, neonatal encephalopathy, admission to neonatal high care nursery for >24 hours and neonatal death. Maternal outcomes were discomfort and any adverse events. Maternal discomfort was assessed by asking women how comfortable they were during labour after randomisation (comfortable, uncomfortable or very uncomfortable).
Reporting of adverse events and serious adverse events was done using standard forms and reported to the DSMB on an expedited basis. Women and neonates were followed up until discharge. Any adverse events were followed up until resolution.
Data management, sample size and statistical analysis
All data were entered into paper study forms. Completed forms were checked by another staff member against the original patient records for correctness. The data were double-entered into OpenClinica, a web-based, GCP-compliant data management system. Validation and consistency checks ensured accuracy and completeness of entered data.
The sample size was powered to detect a reduction in the primary outcome of mean time (minutes) from randomisation to birth of ≥3 min, based on Api et al 14 who reported a time from randomisation to birth of 23.1 min (SD 12.2 min) in the control group (n=56), and 18.6 min (SD 9.5 min) in the fundal pressure group (n=34). We assumed that upright position alone would likely lie between these two (ie, approximately 20.0 min). We assumed a power of 90% and alpha of 95%. Using the Bonferroni rule to control for multiplicity, alpha is divided by the number of comparisons (0.05/3≈0.02). The study therefore required 347 women in each arm, that is, 1041 women for all three arms. To allow for 10% non-compliance, we aimed to recruit 382 in each arm, for a total sample size of 1146 women.
The statistical analysis plan was finalised before data analysis. An interim analysis was conducted after approximately 50% of participants were randomised; results reviewed by the DSMB who recommended that the trial continue. The primary analysis (intention to treat, ITT) was based on all participants with outcome data available as per their original allocation, regardless of compliance. Baseline characteristics for the randomised population were tabulated. Frequencies and percentages were reported for categorical outcome variables, while for continuous outcome variables the number of participants, means and SD were reported. Where the distribution was non-normal, medians, IQR, minima and maxima were reported.
In the event the primary outcome distribution was approximately normal, we planned to use crude mean (SD), and analysis of variance (ANOVA) regression models to compare the effect size between the three treatment groups, adjusted for centre. However, the data were non-normal (right skewed), and the natural logarithm (log) of the primary outcome was approximately normally distributed, hence we used a log transformation. In case of a statistically significant difference between the three treatment groups by the ANOVA test, additional pairwise tests were planned. The non-parametric Kruskal-Wallis test was used to compare differences in crude median time to birth, while Kaplan-Meier (K-M) right-censored survival analysis was used to analyse and compare median time to birth, as well as the rates between treatment groups, with significance tested using the log-rank p value stratified for centre.
For the secondary outcomes, log-binomial regression modelling was used to compare the risk of the outcome between treatment groups, adjusted for centre. Where the log-binomial model did not converge, a modified Poisson regression modelling with a robust variance was used.15 The crude proportion of severe adverse events (SAE) per randomised women was computed. A Poisson distributed generalised estimating equation model, with an independent working correlation structure, was used to estimate adjusted incidence rates of SAEs (expressed as events per 100 woman-days of observations, postrandomisation) as well as adjusted incidence rate ratios. The simpler independent correlation structure was chosen as some participants had more than one SAE, and also due to independency between reported SAEs per participant. Two-sided tests and 5% significance levels were used and 95% CIs for all relevant parameters. Statistical analysis was conducted using SAS/STAT software, V.9.4 of the SAS System for Windows.16 The graphs were plotted using R software.17
Results
Between 12 March 2015 and 11 August 2017 we randomly allocated 1158 women to GAP in upright position (n=388), upright position (n=386) and routine practice (n=384) (see figure 1). Ten protocol violations occurred after randomisation. No women or babies were lost to follow-up, hence the ITT analysis population included 1158 women and 1158 babies. The trial ended as the predetermined sample size target had been reached.
Consolidated Standards of Reporting Trials (CONSORT) flow diagram. ‡Completed study, if followed up from randomisation to maternal discharge from maternity unit (with non-missing date of discharge from maternity clinic). †Lost to follow-up is considered if occurred in the period following randomisation and prior to mom being discharged from maternity clinic. GAP, gentle assisted pushing; ITT, intention to treat.
Baseline characteristics were largely similar across all three arms—overall, the median gestational age was 38 weeks and 21.8% of all women were HIV positive (table 1). At baseline, most women were in spontaneous labour (5.3% had labour induced) and 64.4% had not received pain relief medication. Labour augmentation in the second stage (prior to randomisation) was different between groups (5.9% in GAP, 3.1% in upright position, 2.6% in routine group). In the GAP group, GAP was applied a median of two times (IQR 1.0–3.0), and at least once in 320 women (82.5%), compared with four women (1.0%) in the upright group and five women (1.3%) in the routine practice group (table 2). Women in the GAP group spent a median of 5.0 min (IQR 3.0–9.0) in the upright position compared with 6.0 min (IQR 3.0–10.0) for the upright position group and 0.0 min (IQR 0.0–0.0) for the routine practice group. Overall, over 95.6% of women gave birth by spontaneous, cephalic vaginal birth (table 3).
Baseline data
Treatment adherence
Birth outcomes
Data on the primary outcome were available for all women. The median duration from randomisation to birth was similar (14 min) in all three arms (table 4). Significance testing (of crude, natural log and ANOVA model adjusted for study centre) showed no difference between the three arms. The adjusted difference in mean log duration from randomisation to birth showed that GAP did not have an effect compared with routine practice (0.04 log min, 95% CI −0.14 to 0.20), nor when compared with upright position (−0.11 log min, 95% CI −0.28 to 0.06). Compared with routine practice, upright position also did not meaningfully reduce time to birth (0.14 log min, 95% CI −0.03 to 0.31) (online supplementary appendix 4: table 1). The K-M survival analysis did not show substantive differences between arms (online supplementary appendix 4: figure 1 and table 2). We also analysed the primary outcome among women with spontaneous birth only (1112 women), and results were similar.
Supplemental material
Primary outcome: duration from randomisation to birth in minutes
Table 5 reports the effects on maternal and newborn secondary outcomes; several outcomes had few or zero events. There were four neonatal deaths in total—one each in the GAP and upright position arms, and two in the routine practice arm. No substantive differences were seen, except for differences in maternal discomfort during second stage of labour, which were inconsistent between sites (figure 2). At two sites, discomfort was greater for both GAP and upright position compared with routine practice and similar comparing GAP to upright position, while at the other two sites there were no differences between the groups. Given the differences in labour augmentation at baseline, we analysed primary and secondary outcomes adjusted for centre and augmentation in second stage of labour (prior to randomisation), however results were similar (data not shown).
![[bmjgh-2018-000906-SP3.jpg]](https://gh.bmj.com/content/bmjgh/3/3/e000906/DC3/embed/inline-supplementary-material-3.jpg?download=true){kind=link}
Mother was uncomfortable or very uncomfortable during labour. GAP, gentle assisted pushing.
Secondary outcomes
In total, 33 maternal SAEs occurred—24 in the GAP arm, 3 in the upright position arm and 6 in the routine practice arm. While SAEs were significantly different overall, there were few cases per SAE category, and no obvious pattern of cause (online supplementary appendix 4: table 3). Only one SAE was considered possibly related to the intervention (second-degree perineal laceration in the GAP arm). A total of 57 neonatal SAEs occurred—23 in the GAP arm, 15 in the upright arm and 19 in the routine practice arm. There were three cases of neonatal encephalopathy in the GAP arm, one in the upright position arm and five in the routine care arm.
Discussion
Given the extensive use of fundal pressure during childbirth globally and the vehement opinions both for and against its use, there is remarkably little robust evidence available on its benefits or risks.1 While four studies of fundal pressure applied by an inflatable abdominal belt have shown some reduction in duration of second stage of labour but increased anal sphincter injury, we found only five previous randomised trials of manual fundal pressure of variable quality, which showed no evidence of benefit. Our study also did not show any benefit with manual fundal pressure in the second stage. There are two possible reasons: that the method is indeed ineffective, or that the research process was insufficiently robust to demonstrate benefit. Possible inadequacies include that the women selected were not at sufficiently high risk of prolonged second stage for the intervention to change outcomes, or that the procedure was not applied effectively. Our findings do not exclude the possibility that a more robust form of fundal pressure may be effective.
The Cochrane review on the effect of upright posture alone on second stage of labour (without epidural analgesia) identified 30 trials of 9015 women, however the risk of bias was variable and the findings inconsistent.10 Overall, assisted deliveries, episiotomies and abnormal fetal heart rate patterns were reduced, while second-degree perineal tears and blood loss were increased and caesarean sections were similar between groups. The duration of second stage of labour was reduced overall, but no reduction was found in 12 of 21 studies. Among studies assessed as low risk of bias, the reduction was not statistically significant. Our findings are consistent with the lack of effect found in the trials with low risk of bias.
In our trial, there was a trend to fewer neonatal poor outcomes in both upright posture groups compared with the routine care group. While numbers were small and no statistical significance was reached, better neonatal outcomes would be consistent with the finding of fewer abnormal fetal heart rate patterns seen in the Cochrane review.10 Without clear evidence to support one maternal position over another, these results suggest that (in the absence of other clinical indications) women may adopt their preferred position for birth. While this study and other studies in the second stage of labour have been too small to assess the risk of rare adverse events, indirect evidence from large pregnancy posture studies suggests that the supine position may be harmful for babies.18 19
Strengths and limitations
This pragmatic clinical trial had some limitations. The nature of the intervention means that allocation cannot be concealed, which can potentially bias results. While adherence was generally good, women were able to take an alternative birth position if they preferred. Notably, 17.5% of women in the GAP group did not have GAP applied, either due to birth occurring soon after randomisation, or the woman or attendant declining the intervention. While our results suggest that maternal discomfort may be greater in upright positions, this should be interpreted with caution given the variability between study sites. The reason for these differences is not known, however questions relating to discomfort may have been interpreted differently. The SAE data should also be considered with caution. As an unblinded trial, there is the risk of differential SAE reporting in different arms. In addition, while all events met the SAE technical criteria, most were relatively minor clinical events that resolved completely.
Conclusion
We have not found evidence of benefit for a new technique of controlled, sustained fundal pressure in the second stage of labour. Our study was too small to address rarer safety outcomes. Use of fundal pressure in the second stage of labour should be limited to further research to determine whether there are techniques or clinical settings in which fundal pressure can be shown to safely assist vaginal birth. Our study did not show benefit of a supported upright position in second stage, and many women found the position uncomfortable. In the absence of clear evidence of benefits for specific positions, women should be encouraged to assume the position they find most comfortable.
Acknowledgments
We acknowledge the members of the GAP Trial Study Group in South Africa: Noxanti Nondlwana, Nolusindiso Yonto, Nosipho Mkhuzangwe, Mandisa Mdingi, Pamela Njikelana, Xoliswa Williams, Thembeka Likota, Ncebakazi Filtane, Nontuthuzelo Toto, Sinteka Tshali, Ntombekaya Betsha, Khayakazi Shiba, Zodwa Fawule, Sindiswa Nduneni, Nomvuyiseko Mbanda, Thandeka Fata, Nontlakanipho Makubalo, Nokupumla Sogiba, Nondzame Cologu, Nomthandazo Monakali, Xoliswa Dastile, Nolukanyo Madliki, Mihle Nontshinga, Phumla Mvango. We gratefully acknowledge the contribution of Haroon Saloojee, Michel Boulvain and Max Petzold as members of the Data and Safety Monitoring Board; the research, nursing and medical staff at Frere Hospital, Cecilia Makiwane Hospital and Butterworth Hospital; and the women who considered or consented to participate in the study. We gratefully acknowledge Tess Lawrie’s contribution to the development of the study protocol.
References
Footnotes
Handling editor Seye Abimbola
Contributors GJH and MS were coprincipal investigators for the trial. At WHO, JPV was the project manager, NAH was the trial statistician, SL was the data manager and AMG was the project coordinator. All authors had full access to all the data in the study and can take responsibility for the integrity of the data and the accuracy of the data analysis. The named authors had final responsibility for the decision to submit for publication.
Funding The UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP) at the World Health Organization (WHO) was the trial sponsor, and provided funds for the trial.
Disclaimer This article represents the views of the named authors only, and not the views of the World Health Organization.
Competing interests None declared.
Patient consent Not required.
Ethics approval University of the Witwatersrand (M131054) and the WHO (A65866) ethics review committees.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Requests for the anonymised, coded trial data can be made to the Department of Reproductive Health and Research, World Health Organization. Data sharing is subject to WHO data sharing policies and data use agreements with the participating research centres.