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Oxytocin use and high newborn weight are associated with increased episiotomy risk during vaginal birthOxytocin use and newborn weight linked to higher episiotomy risk

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Key Takeaway
Note that oxytocin use and high newborn weight are associated with increased episiotomy risk during vaginal birth.

This meta-analysis evaluated the risk factors associated with performing an episiotomy in 17,502 individuals undergoing vaginal birth. The study synthesized data to determine how clinical and demographic variables influence the likelihood of an episiotomy procedure.

The analysis found that both oxytocin use (OR = 2.341; 95% CI [1.652-3.318]; P <.001) and higher newborn weight (OR = 2.393; 95% CI [1.627-3.520]; P <.001) were significantly associated with an increased risk of episiotomy. These findings suggest that these two factors are primary drivers for the decision or necessity of an episiotomy during labor.

In contrast, maternal age (OR = 0.978; P =.466), type of childbirth attendant (OR = 0.920; P =.733), and duration of the second stage of labor (OR = 1.299; P =.314) did not show statistically significant associations with episiotomy risk. The authors noted a lack of sufficient evidence for some specific risk factors.

Clinically, these results suggest that oxytocin use and newborn weight are relevant indicators when assessing the likelihood of an episiotomy during vaginal delivery. However, as this is a meta-analysis of observational data, the findings indicate associations rather than direct causation.

How this fits prior evidence

This meta-analysis identifies oxytocin use as a significant risk factor for episiotomy (OR = 2.341). This finding extends previous evidence regarding oxytocin's role in physiological processes, such as its influence on amygdala activity during stress and its modulation of sleep and stress responses, by identifying a specific clinical association with obstetric outcomes.

When a person goes into labor, doctors sometimes perform an episiotomy. This is a surgical cut made in the vaginal area to help the baby pass through more quickly. New data from a large review of over 17,000 births helps clarify what factors actually increase the risk of this procedure.

The study found that two specific things are linked to a higher chance of an episiotomy: the use of oxytocin and the weight of the newborn. Both of these factors showed a significant link to the procedure. Other factors, like how old the mother is or how long the second stage of labor lasts, did not show a clear connection.

While these findings highlight important patterns for doctors and parents, it is important to remember that this was a meta-analysis. This means it looks at existing data to find trends rather than testing a new treatment directly. Because of this, we cannot say for certain that one factor causes the other, but the link between oxytocin, baby weight, and episiotomy risk is clear.

What this means for you:
Oxytocin use and higher newborn weights are linked to an increased risk of undergoing an episiotomy.

Common questions

What factors increase the risk of an episiotomy?

The study found that both the use of oxytocin and the weight of the newborn are significant risk factors for an episiotomy. These two factors were linked to a much higher likelihood of the procedure compared to other factors like maternal age or the length of labor.

Does the mother's age affect the risk of an episiotomy?

No, the data did not show a statistically significant link between maternal age and the risk of an episiotomy. Other factors like the type of childbirth attendant or the duration of the second stage of labor also did not show a significant impact.

How many people were included in this study?

The data came from a meta-analysis that included a large sample size of 17,502 individuals undergoing vaginal birth. This large number helps provide a clearer picture of the risks associated with oxytocin and newborn weight.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
BACKGROUND: Despite the numerous harms associated with episiotomy during vaginal birth, the risk factors for this procedure remain a topic of controversy. This study aimed to identify the potential risk factors for episiotomy during vaginal birth. METHODS: A systematic search was conducted across 7 databases, including PubMed/MedLine, Embase, Cochrane, Web of Science, Chinese Knowledge Infrastructure (CNKI), and Wanfang, up to January 2025. Statistical analyses, including heterogeneity tests, sensitivity analysis, and publication bias assessment, were conducted using Stata 18.0 and Review Manager 5.4. RESULTS: A total of 16 articles were included in this meta-analysis, comprising a sample size of 17,502 individuals. Newborn weight (odds ratio [OR] = 2.393; 95% confidence interval [CI] = 1.627-3.520; P < .001) and oxytocin use (OR = 2.341; 95% CI = 1.652-3.318; P < .001) were identified as significant risk factors for episiotomy. In contrast, maternal age (OR = 0.978; 95% CI = 0.922-1.038; P = .466), the type of childbirth attendant (OR = 0.920; 95% CI = 0.569-1.488; P = .733), and the duration of the second stage of labor (OR = 1.299; 95% CI = 0.781-2.162; P = .314) were not statistically significant risk factors for episiotomy. CONCLUSION: High newborn weight and oxytocin use are associated with higher rates of episiotomy. However, other potential risk factors are still controversial due to a lack of sufficient evidence, highlighting the need for more rigorous studies to strengthen the evidence base.
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