Operative Vaginal Delivery

Operative (assisted) vaginal delivery is the use of an instrument — a vacuum extractor (ventouse) or obstetric forceps — to assist the birth of the baby through the vagina, typically in the second stage of labour. Although the procedure is performed by an appropriately trained practitioner, midwives need a working understanding of its indications, prerequisites, instruments, and risks to support women and to participate in safe care and informed choice.

Definition

Operative vaginal delivery is the assisted birth of a baby through the vagina using a vacuum extractor or obstetric forceps, undertaken when there is an indication and the prerequisites for safe instrumental birth are met.

Scope

The entry covers the concept of assisted vaginal birth: the broad indications and prerequisites, the two main instrument types (vacuum and forceps) and how they compare, the relationship to perineal trauma and episiotomy, and the place of the procedure relative to caesarean birth. It is a reference overview and does not describe operative technique, instrument selection for an individual, or any dosing or treatment advice.

Core questions

• What are the broad indications for and prerequisites of assisted vaginal birth?
• How do vacuum extraction and forceps compare in outcomes?
• What maternal and neonatal risks are associated with operative vaginal delivery?
• How does the option relate to caesarean birth and to perineal trauma and episiotomy?

Key concepts

• Assisted (instrumental) vaginal birth
• Vacuum extraction (ventouse)
• Obstetric forceps
• Indications and prerequisites
• Perineal trauma and obstetric anal sphincter injury
• Episiotomy
• Comparison with caesarean birth
• Operator training and informed consent

Mechanisms

An operative vaginal birth applies traction (forceps) or suction-assisted traction (vacuum) to the fetal head, coordinated with maternal pushing and uterine contractions, to assist descent and delivery during the second stage. The instruments differ in their mechanism and risk profile: vacuum extraction is generally associated with less maternal trauma but more failure to deliver and certain neonatal effects, whereas forceps are more likely to achieve birth but carry a higher risk of significant maternal perineal trauma (O'Mahony et al., 2010). Episiotomy and perineal practices interact with the risk of severe perineal injury during assisted birth (Jiang et al., 2017).

Clinical relevance

Assisted vaginal birth is one of the options for a prolonged or complicated second stage or when expediting birth is indicated, and it is weighed against caesarean birth; structured guidance sets out the prerequisites and safeguards for performing it (Murphy et al., 2020). For midwives, understanding the procedure supports preparation of the woman, informed choice, and safe team care. This entry is a reference overview and does not describe how to perform the procedure or select an instrument for any individual.

Epidemiology

Rates of operative vaginal birth and the balance between vacuum and forceps vary substantially between countries and institutions and have shifted over time alongside changes in caesarean birth rates and training. Assisted vaginal birth is associated with a recognised risk of obstetric anal sphincter injury, the frequency of which depends on instrument, technique, and perineal management.

Evidence & guidelines

A Cochrane review comparing instruments finds trade-offs between vacuum and forceps in success and maternal and neonatal outcomes (O'Mahony et al., 2010); evidence on episiotomy supports selective rather than routine use, including in the context of assisted birth (Jiang et al., 2017); and the RCOG Green-top Guideline on Assisted Vaginal Birth synthesises indications, prerequisites, and safeguards (Murphy et al., 2020). WHO (2018) intrapartum recommendations address the broader context of second-stage care.

History

Obstetric forceps have a long history in assisted birth, while the vacuum extractor was developed and popularised in the mid-twentieth century as an alternative. Over recent decades, attention to maternal trauma, neonatal safety, and operator training — together with rising caesarean rates — reshaped practice and the relative use of the two instruments, and guideline bodies codified the prerequisites for safe assisted vaginal birth.

Debates

Vacuum or forceps as the preferred instrument?

Vacuum extraction tends to cause less maternal trauma but fails to achieve birth more often, while forceps are more likely to succeed but carry greater risk of severe perineal injury, so the preferred instrument remains a context- and operator-dependent judgement.

Seminal works

• omahony-2010
• murphy-2020

Frequently asked questions

What instruments are used for operative vaginal delivery?

The two main instruments are the vacuum extractor (ventouse) and obstetric forceps; each has a different mechanism and risk profile, and the choice depends on the clinical situation and operator experience.

Is assisted vaginal birth performed by midwives?

It is performed by an appropriately trained practitioner; many midwives support the woman and the team around the procedure, and in some settings specially trained midwives perform vacuum births. This entry is a reference overview and not training in technique.