Medical Interventions During Labor

Core Concepts

Induction versus augmentation

Induction of labor means starting labor with interventions when it has not begun on its own. Common reasons include prolonged pregnancy (postdates), hypertensive disorders of pregnancy, diabetes, oligohydramnios (low amniotic fluid), fetal growth restriction, premature rupture of membranes, or chorioamnionitis — the specific indications follow the institution's guidelines and the provider's judgment. Augmentation means speeding up a labor already in progress but progressing too slowly (see Labor Dystocia). The starting state — membranes intact or ruptured, cervix ripe or unripe, contractions present or absent — determines which method is chosen.

Cervical ripening

Before induction, the provider assesses cervical "ripeness" (softness, effacement, dilation, position, and station, often scored with a clinical tool such as the Bishop score — a scoring system, not a lab value). If the cervix is unfavorable, cervical ripening may be used first: pharmacologic agents (e.g., prostaglandin preparations given per order — the nurse never chooses the drug or dose) or mechanical methods (e.g., a balloon catheter or hygroscopic dilators). The nurse monitors for uterine activity, FHR changes, and side effects, and reassesses per protocol.

Amniotomy

Amniotomy — artificial rupture of the membranes (AROM) — is done with a sterile instrument by the provider or midwife. It may induce or augment labor, or allow direct fetal assessment. The nurse documents the FHR, notes the color and amount of amniotic fluid (clear versus meconium-stained or bloody), and reports the time of rupture, because the duration of ruptured membranes is a risk factor for infection. After membranes rupture, the nurse also watches for cord prolapse — sudden variable or prolonged decelerations, especially with a position change, warrant immediate provider notification.

Oxytocin infusion

Oxytocin is a uterotonic medication used to induce or augment labor; it is always given per provider order as a continuous infusion with a pump and careful titration. The nurse's responsibilities are intense:

• Monitor the FHR continuously (per protocol) — oxytocin can cause fetal distress.
• Monitor contractions — hyperstimulation (too many or too strong, sometimes called tachysystole) reduces fetal oxygenation between contractions.
• Track fluid balance — oxytocin has an antidiuretic effect and IV fluids are running.
• Know the emergency response: if hyperstimulation or a non-reassuring FHR occurs, the nurse typically stops or reduces the infusion per protocol, repositions the person (usually side-lying), increases IV fluid per orders, and notifies the provider — per unit policy.
• Never adjust the rate on judgment alone — changes are ordered and documented.

Amnioinfusion

Amnioinfusion is the instillation of warmed sterile fluid into the uterus through a catheter, ordered by the provider to relieve cord compression (variable decelerations) or dilute thick meconium. The nurse prepares the fluid, monitors the infusion, and watches for overdistention or FHR changes. It is a targeted intervention — not a routine procedure.

Assisted vaginal birth (vacuum or forceps)

When the second stage is prolonged, the fetus shows signs of intolerance, or the laboring person cannot push effectively, the provider may perform an assisted vaginal birth using a vacuum extractor or forceps. The nurse prepares the equipment, ensures the bladder is empty, provides support, monitors the FHR, and is ready for immediate newborn care — assisted birth is associated with neonatal scalp injuries or cephalohematoma and perineal trauma. The decision, technique, and criteria follow provider judgment and institutional protocols; the nurse does not perform the procedure.

Cesarean birth

If vaginal birth is unsafe or unsuccessful, cesarean birth is performed (see the dedicated topic); the nurse prepares the person for surgery, assists with consent documentation, and provides care before, during, and after — it is major abdominal surgery with its own recovery needs.

The nursing role across all interventions

Across every intervention the nurse: verifies the order and identity/consent status; explains the procedure; monitors the FHR, contractions, and vital signs; documents the intervention, time, findings, and responses; reports abnormal findings promptly; and advocates for the pregnant person's preferences. Scope of practice matters: which actions a nurse may perform independently (monitoring, education, positioning, notification) versus which require an order or a provider (medication decisions, amniotomy, instrument placement) varies by jurisdiction, license, and institutional policy.

Clinical Scenario: Oxytocin and a Sudden Deceleration

During augmentation with an oxytocin infusion, the nurse notices contractions every 90 seconds lasting over 90 seconds — too frequent and too long — and the FHR shows late decelerations. Following the unit's protocol, the nurse turns down (or stops) the infusion as directed, repositions the laboring person to side-lying, increases the IV rate per orders, and calls the provider with a structured report. The FHR recovers, and labor resumes at a safer pace. The nurse documents the event, the actions, the response, and the new orders — a textbook example of recognizing hyperstimulation early and acting without hesitation.

Common Confusions