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Labor Induction and Augmentation
Labor induction
As the end of pregnancy nears, the cervix normally becomes soft (ripe) and begins to open (dilate) and thin (efface), preparing for labor and delivery. When labor does not naturally start on its own and vaginal delivery needs to happen soon, labor may be started artificially (induced).
Even though inducing labor is a fairly common practice, childbirth educators encourage women to learn about it and about the medicine for stimulating a stalled labor (augmentation) so that the women can help decide what is right for them.
When labor does not happen as expected or as necessary, inducing labor is preferred over delivering by cesarean section. If labor induction isn't successful, another attempt may be possible. In some cases, a cesarean delivery is best for the mother and baby, depending on their conditions.
Your labor may be induced for one of the following reasons:
- Your pregnancy has gone 1 to 2 weeks past the estimated due date.
- You have a condition (such as high blood pressure, placenta abruptio, infection, lung disease, preeclampsia, or diabetes) that may threaten your health or the health of your baby if the pregnancy continues.1
- Your water (amniotic sac) has broken but active labor contractions have not started.
- Your baby has a condition that needs treatment, and the risks of vaginal delivery are low. Induction and vaginal delivery are not attempted if the baby may be harmed or is in immediate danger. In such cases, a cesarean delivery (C-section) is usually performed.
There are several ways to induce labor contractions.
- Medicine may be used to soften the cervix and help it thin (efface).
- Medicine may be used to cause the uterus to contract.
- A balloon catheter (such as a Foley catheter) may be used to help the cervix open.
- If your cervix is soft and slighty open, sweeping the membranes or rupturing the amniotic sac (amniotomy) may start or increase contractions.
- If labor does not progress after an amniotomy, medicine such as oxytocin (Pitocin) can be used to stimulate contractions.
Medicine to ripen the cervix and induce labor
- Misoprostol (Cytotec) is a pill taken by mouth or placed in the vagina (using a smaller dose). It is a medicine currently approved for treating ulcers. Using it for cervical ripening is a widely accepted but unlabeled use of this medicine.
- Oxytocin (Pitocin) can be given through a vein (intravenously) in small amounts to ripen the cervix. But it usually is given after the cervix softens, to cause the uterus to contract. Labor that is induced by oxytocin usually starts off harder and progresses faster than labor that starts on its own, especially in first-time mothers. If oxytocin does not induce labor or if the baby's heart rate indicates distress, a cesarean delivery (C-section) may be necessary.
- Dinoprostone (such as Cervidil or Prepidil Gel) can be inserted as a suppository into your vagina (intravaginally). It can also be given as a gel that is gently squirted into the opening of the cervix (intracervically). When the cervix is ripe, labor may start on its own.
The cervix is considered ripe and ready for active labor when it is soft, well-dilated, and effaced, and when the cervix and baby are positioned low in the pelvis. If the cervix is not ripe enough, medicines may be continued until it is.
Balloon catheter to help induce labor
A balloon catheter, such as a Foley catheter, is a narrow tube with a small balloon on the end. The doctor inserts it into the cervix and inflates the balloon. This helps the cervix open (dilate). The catheter is left in place until the cervix has opened enough for the balloon to fall out (about 3 cm).
Sweeping of the membranes to help induce labor
Sweeping, or stripping, of the amniotic membranes is a simple first step used to try to start labor. Sweeping of the membranes separates the amniotic membrane from the uterus enough so that the uterus starts making prostaglandins. This type of chemical helps trigger contractions and labor. After the cervix is open a little, this step can easily be done in your doctor's or nurse-midwife's office.
Sweeping the membranes works in 1 out of 8 women. This means that it starts labor without needing to use oxytocin or artificially rupture the membranes.2 To sweep the membranes, your doctor or nurse-midwife reaches a gloved finger through the cervix. He or she then "sweeps" the finger around the inside edge of the opening.
Sweeping the membranes is low-risk. It does not raise your risk of infection. You may start to feel uncomfortable afterward, with irregular contractions and some bleeding.2
Artificial rupture of the membranes to induce labor
To help start or speed up labor, your doctor may rupture your amniotic sac (rupture of the membranes). This should only be done after your cervix has started to open (dilate) and the baby's head is firmly descended (engaged) in your pelvis. If the membranes are ruptured too early, there is a risk of the umbilical cord slipping down around or below the baby's head (cord prolapse). If the cord gets squeezed between the baby's head and the pelvis bones, the blood supply to the baby may be reduced or stopped.
To rupture your amniotic sac (amniotomy), your doctor inserts a sterile plastic device into your vagina. This device may look like a long crochet hook or may be a smaller hook attached to the finger of a sterile glove. The hook is used to pull gently on the amniotic sac until the sac breaks. This procedure is usually not painful. A large gush of fluid usually follows the rupture of the amniotic sac. The uterus continues to produce amniotic fluid until the baby's birth, so you may continue to feel some leaking, especially right after a hard contraction.
Augmentation
If active labor has started on its own but contractions have slowed down or completely stopped, steps need to be taken to help labor progress (augmentation). Augmentation will be done when:
- Active labor has started, but your contractions are weak or irregular or have stopped entirely.
- You have gone into active labor, but the amniotic sac has not ruptured on its own. In this case, your doctor or nurse midwife may rupture the amniotic sac (amniotomy) to augment labor. If labor still does not progress, oxytocin (Pitocin) may be given to make the uterus contract.
- Active labor has started and the amniotic sac has ruptured on its own, but labor still is not progressing. Oxytocin (Pitocin) may be given to make the uterus contract.
For some women, laboring in a warm tub or whirlpool (under medical care) helps with a slow labor. This can make augmentation unnecessary.3
If labor fails to progress in spite of membrane sweeping, an amniotomy, oxytocin, or a combination of these measures, delivery by cesarean section may be considered.
| By: | Healthwise Staff | Last Revised: February 24, 2010 |
| Medical Review: | Kathleen Romito, MD - Family Medicine Sarah Anne Marshall, MD - Family Medicine Kirtly Jones, MD - Obstetrics and Gynecology | |
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