Association between women's self-diagnosis of labor and labor duration after admission

Symptoms of onset of labour and early labour: A scoping review

BACKGROUND

Early labour care often insufficiently addresses the individual needs of pregnant women leading to great dissatisfaction. In-depth knowledge about symptoms of onset of labour and early labour is necessary to develop women-centred interventions.

QUESTION OR AIM

To provide an overview on the current evidence about pregnant women's symptoms of onset of labour and early labour.

METHODS

We conducted a scoping review in the five databases PubMed, Web of Science, CINHAL Complete, PsychInfo and MIDIRS in May 2021 and August 2022 using a sensitive search strategy. A total of 2861 titles and abstracts and 290 full texts were screened independently by two researchers using Covidence. For this article, data was extracted from 91 articles and summarised descriptively and narratively.

FINDINGS

The most frequently mentioned symptoms were 'Contractions, labour pain' (n = 78, 85.7 %), 'Details about the contractions' (n = 51 articles, 56.0 %), 'Positive and negative emotions' (n = 50, 54.9 %) and 'Fear and worries' (n = 48 articles, 52.7 %). Details about the contractions ranged from a slight pulling to unbearable pain and the emotional condition varied from joy to great fear, showing an extraordinary diversity of symptoms highlighting the very individual character of early labour.

DISCUSSION

A comprehensive picture of varying and contradicting symptoms of onset of labour and early labour was drawn. Different experiences indicate different needs. This knowledge builds a good basis to develop women-centred approaches to improve early labour care.

CONCLUSION

Further research is necessary to design individualised early labour interventions and evaluate their effectiveness.

Development and validation of a predictive model to identify the active phase of labor

Background

The diagnosis of the active phase of labor is a crucial clinical decision, thus requiring an accurate assessment. This study aimed to build and to validate a predictive model, based on maternal signs and symptoms to identify a cervical dilatation ≥4 cm.

Methods

A prospective study was conducted from May to September 2018 in a II Level Maternity Unit (development data), and from May to September 2019 in a I Level Maternity Unit (validation data). Women with singleton, term pregnancy, cephalic presentation and presence of contractions were consecutively enrolled during the initial assessment to diagnose the stage of labor. Women < 18 years old, with language barrier or induction of labor were excluded. A nomogram for the calculation of the predictions of cervical dilatation ≥4 cm on the ground of 11 maternal signs and symptoms was obtained from a multivariate logistic model. The predictive performance of the model was investigated by internal and external validation.

Results

A total of 288 assessments were analyzed. All maternal signs and symptoms showed a significant impact on increasing the probability of cervical dilatation ≥4 cm. In the final logistic model, “Rhythm” (OR 6.26), “Duration” (OR 8.15) of contractions and “Show” (OR 4.29) confirmed their significance while, unexpectedly, “Frequency” of contractions had no impact. The area under the ROC curve in the model of the uterine activity was 0.865 (development data) and 0.927 (validation data), with an increment to 0.905 and 0.956, respectively, when adding maternal signs.

The Brier Score error in the model of the uterine activity was 0.140 (development data) and 0.097 (validation data), with a decrement to 0.121 and 0.092, respectively, when adding maternal signs.

Conclusion

Our predictive model showed a good performance. The introduction of a non-invasive tool might assist midwives in the decision-making process, avoiding interventions and thus offering an evidenced-base care.

High dose vs. low dose oxytocin for labor augmentation: a systematic review and meta-analysis of randomized controlled trials

OBJECTIVES

To compare the safety and efficacy between high dose and low dose oxytocin administration for labor augmentation.

METHODS

We searched for the available studies during March 2020 in PubMed, Cochrane Library, Scopus, and ISI Web of science. All randomized clinical trials (RCTs) that assessed safety and efficacy of high dose vs. low dose oxytocin for labor augmentation were considered. The extracted data were entered into RevMan software. Dichotomous and continuous data were pooled as odds ratio (OR) and mean difference (MD) respectively, with the corresponding 95% confidence intervals (CI). Our main outcomes were cesarean delivery rate, spontaneous vaginal delivery rate, uterine hyperstimulation and tachysystole, and labor duration from oxytocin infusion.

RESULTS

Eight RCTs with 3,154 patients were included. High dose oxytocin did not reduce cesarean delivery rate compared to low dose oxytocin (OR=0.76, 95% CI [0.52, 1.10], p=0.15). After solving the reported heterogeneity, high dose oxytocin did not increase the rate of spontaneous vaginal deliveries vs. low dose oxytocin (OR=1.06, 95% CI [0.84, 1.32], p=0.64). Low dose oxytocin was linked to a significant decline in uterine hyperstimulation and tachysystole (p>0.001). A reduction in labor duration was found in high dose oxytocin group over low oxytocin regimen (MD=-1.02 h, 95% CI [-1.77, -0.27], p=0.008).

CONCLUSIONS

We found no advantages for high dose oxytocin over low dose oxytocin in labor augmentation except in reducing labor duration. Low dose oxytocin is safer as it decreases the incidence of uterine hyperstimulation and tachysystole. More trials are needed to confirm our findings.

Describing latent phase duration and associated characteristics among 1281 low-risk women in spontaneous labor

BACKGROUND

Recent research suggests that latent phase of labor may terminate at 6 rather than 4 centimeters of cervical dilation. The objectives of this study were to: (a) characterize duration of the latent phase of labor among term, low-risk, United States women in spontaneous labor using the women's self-identified onset; and (b) quantify associations between demographic and maternal/newborn health characteristics and the duration of the latent phase.

METHODS

This prospective study (n = 1281) described the duration of the latent phase of labor in hours, stratified by parity at the mean, median, and 80th, 90th, and 95th percentiles. The duration of the latent phase was compared for each characteristic using t tests or Wilcoxon rank-sum tests and regression models that controlled for confounders.

RESULTS

In this sample of predominantly white, healthy women, duration of the latent phase of labor was longer than described in previous studies: The median duration was 9.0 hours and mean duration was 11.8 hours in nulliparous women. The median duration was 6.8 hours and mean duration was 9.3 hours in multiparous women. Among nulliparous women, longer duration was seen in women whose fetus was in a malposition. Among multiparous women, longer durations were noted in women with chorioamnionitis and those who gave birth between 41 and 41 + 6 weeks' gestation (vs between 40 and 40 + 6 weeks' gestation).

CONCLUSIONS

The latent phase of labor may be longer than previously estimated. Contemporary estimates of latent phase of labor duration will help women and providers accurately anticipate, prepare, and cope during spontaneous labor.

Duration of spontaneous labour in 'low-risk' women with 'normal' perinatal outcomes: A systematic review

BACKGROUND

Despite decades of research, the concept of normality in labour in terms of its progression and duration is not universal or standardized. However, in clinical practice, it is important to define the boundaries that distinguish what is normal from what is abnormal to enable women and care providers have a shared understanding of what to expect and when labour interventions are justified.

OBJECTIVES

To synthesise available evidence on the duration of latent and active first stage and the second stage of spontaneous labour in women at low risk of complications with 'normal' perinatal outcomes.

SEARCH STRATEGY

PubMed, EMBASE, CINAHL, POPLINE, Global Health Library, and reference lists of eligible studies.

SELECTION CRITERIA

Observational studies and other study designs.

DATA COLLECTION AND ANALYSIS

Four authors extracted data on: maternal characteristics; labour interventions; duration of latent first stage, active first stage, and second stage of labour; and the definitions of onset of latent and active first stage, and second stage where reported. Heterogeneity in the included studies precluded meta-analysis and data were presented descriptively.

MAIN RESULTS

Thirty-seven studies reporting the duration of first and/or second stages of labour for 208,000 women met our inclusion criteria. Among nulliparous women, the median duration of active first stage (when the starting reference point was 4 cm) ranged from 3.7-5.9 h (95th percentiles: 14.5-16.7 h). With active phase starting from 5 cm, the median duration was from 3.8-4.3 h (95th percentiles: 11.3-12.7 h). The median duration of second stage ranged from 14 to 66 min (95th percentiles: 65-138 min) and from 6 to 12 min (95th percentiles: 58-76 min) in nulliparous and parous women, respectively. Sensitivity analyses excluding first and second stage interventions did not significantly impact on these findings CONCLUSIONS: The duration of spontaneous labour in women with good perinatal outcomes varies from one woman to another. Some women may experience labour for longer than previously thought, and still achieve a vaginal birth without adverse perinatal outcomes. Our findings question the rigid limits currently applied in clinical practice for the assessment of prolonged first or second stage that warrant obstetric intervention.

Diagnosing onset of labor: a systematic review of definitions in the research literature

BACKGROUND

The diagnosis of labor onset has been described as one of the most important judgments in maternity care. There is compelling evidence that the duration of both latent and active phase labor are clinically important and require consistent approaches to measurement. In order to measure the duration of labor phases systematically, we need standard definitions of their onset. We reviewed the literature to examine definitions of labor onset and the evidentiary basis provided for these definitions.

METHODS

Five electronic databases were searched using predefined search terms. We included English, French and German language studies published between January 1978 and March 2014 defining the onset of latent labor and/or active labor in a population of healthy women with term births. Studies focusing exclusively on induced labor were excluded.

RESULTS

We included 62 studies. Four 'types' of labor onset were defined: latent phase, active phase, first stage and unspecified. Labor onset was most commonly defined through the presence of regular painful contractions (71% of studies) and/or some measure of cervical dilatation (68% of studies). However, there was considerable discrepancy about what constituted onset of labor even within 'type' of labor onset. The majority of studies did not provide evidentiary support for their choice of definition of labor onset.

CONCLUSIONS

There is little consensus regarding definitions of labor onset in the research literature. In order to avoid misdiagnosis of the onset of labor and identify departures from normal labor trajectories, a consistent and measurable definition of labor onset for each phase and stage is essential. In choosing standard definitions, the consequences of their use on rates of maternal and fetal morbidity must also be examined.

The current state of midwifery and development of midwifery research in four European countries

OBJECTIVE

to describe the current state of midwifery and explore the development of midwifery research during the last two decades in four non-English speaking European countries in order to understand what factors influenced the course of establishing research as a professional activity.

DESIGN

qualitative collective case study.

SETTING

Germany, Austria, Switzerland and the Netherlands.

FINDINGS

with the ICM Workshop in Germany in 1989 as a central starting point for midwifery research in all four countries, different courses, in timing as well as content, characterised its development in the individual countries. Major factors contributing to this development during the last decades involved the history and character of midwifery, initiatives of individual midwifery researchers, alliances with other professions and the transition of midwifery programmes into higher education. Whereas midwifery research is currently established as a professional role in all countries, future challenges involve the creation of its own profile and identity, while building up its own academic workforce and strengthening the role of midwifery in multidisciplinary alliances.

KEY CONCLUSIONS AND IMPLICATIONS

although a common vision was shared between the four countries in 1989, midwifery research developed as a context-specific phenomenon related to the character of midwifery and education in each country. These factors have to be taken into account in the further development of midwifery as an academic discipline at a national as well as at an international level.

Women's perception of the onset of labour and epidural analgesia: a prospective study

OBJECTIVE

childbearing women and their midwives differ in their diagnoses of the onset of labour. The symptoms women use to describe the onset of labour are associated with the process of labour. Perinatal factors and women's attitudes may be associated with the administration of epidural analgesia. Our study aimed to assess the correlation between women's perception of the onset of labour and the frequency and timing of epidural analgesia during labour.

DESIGN

prospective cohort study.

SETTING

41 maternity units in Lower Saxony, Germany.

PARTICIPANTS

549 nulliparae (as defined in the "Methods" section) and 490 multiparae giving birth between April and October 2005. Women were included after 34 completed weeks of gestation with a singleton in vertex presentation and planned vaginal birth.

MEASUREMENTS

the association between women's symptoms at the onset of labour and the administration of epidural analgesia - frequency, timing in relation to onset of labour and cervical dilatation - was assessed. The analysis was performed by Kaplan-Meiers estimation, logistic regression and Cox regression.

FINDINGS

a total of 174 nulliparae and 49 multiparae received epidural analgesia during labour. Nulliparae received it at a median time of 5.47hrs (range: 0.25-51.17hrs) after onset of labour, at a median cervical dilatation of 3.3cm (range: 1.0-10.0cm). In multiparae, epidural analgesia was applied at a median time of 3.79hrs (range: 0.42-28.55hrs) after onset of labour; the median cervical dilatation was 3.0cm (range: 1.0-8.0cm). Women who were admitted with advanced cervical dilatation received epidural analgesia less often. Women who defined their onset of labour earlier than it was diagnosed by their midwives received epidural analgesia earlier. Gastrointestinal symptoms and irregular pain at the onset of labour were associated with later administration of epidural analgesia. Induction of labour was associated with a reduced interval from the onset of labour to epidural analgesia.

KEY CONCLUSIONS

women's self-diagnosis of the onset of labour and their perception of their labour duration when meeting their midwives has some impact on their admission to the labour ward and the timing of epidural analgesia.

IMPLICATIONS FOR PRACTICE

consideration of women's own perceptions and expectations regarding the onset and process of labour is necessary for individual care during labour.