Tag Archives: hospital policies

Applying medical research to clincial realities

Isabel recently asked over on Uterine rupture rates after 40 weeks:

“I wonder however if there are studies that compare the method of induction. My Doula said that the increase rates of uterine/ scar rupture was due to using high dosages of Pitocin, but now the induction uses lower dosages and administered at longer intervals. Do you know something about this?
Thank you”

 

Isabel,

Great question.

A few factors to consider:

1. Induction protocols can vary by provider, including some providers who don’t induced planned VBACs at all.
2. Induction guidelines can vary by hospital.
3. Women can react to the same drug/dose differently.
4. Some studies do compare the uterine rupture rates among spontaneous, induced, and augmented planned VBACs.

Medical studies on induction are only relevant to your situation if your provider follows the same protocol outlined in the study. However induction protocols are often not spelled out in detail unless that is the focus of the study.

When reading medical research, make special note of the sample size. We need ample participants in order to accurately capture and report the incidence of uncommon events such as uterine rupture. I typically like to see at least 3,000.  

Also remember that it’s ideal to have a experimental group (who receives the induction protocol) and a control group (who does not receive the induction protocol) in order to measure the difference in outcomes, such as fetal distress, uterine rupture, hemorrhage, cesarean hysterectomy, etc. Ideally, we would have a couple thousand, at least, in the experimental and control group.

In terms of the trend that induction now uses lower dosages and is administered at longer intervals, that may be true in some practices, but I would always confirm and not assume.

Anecdotally, I have heard a wide range of induction protocols reported just as research has identified similar variations among cesarean and episiotomy rates that are not linked to medical indication. This California Healthcare Foundation infographic clearly illustrates how hospitals differ:

Tale of Two Births

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In terms of specific studies comparing the method of induction, the first resource that comes to mind is the Guise 2010 Evidence Report.

Search for the word Cytotec and there is a discussion comparing rates of rupture by Pitocin, prostaglandins, and Cytotec.

Pitocin is associated with the lowest rate of rupture among the chemical agents which is likely why ACOG (2010) recommends Pitocin and/or Foley catheter induction in planned VBACs when a medical indication presents. (Learn more about what the Pitocin insert actually says.)

There may be more recent studies out there. Google Scholar is a good place to start. You can often obtain the full texts of medical studies at your local library, university, or graduate school.

Also, if you subscribe to Evidence Based Birth’s newsletter, she will email you a crash course on how to find good evidence.

I hope this helps!

Jen

What is the induction protocol at your facility? Does it differ for those with a prior cesarean? Let me know in the comment section.

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American College of Obstetricians and Gynecologists. (2010). Practice Bulletin No. 115: Vaginal Birth After Previous Cesarean Delivery. Obstetrics and Gynecology, 116 (2), 450-463, http://dhmh.maryland.gov/midwives/Documents/ACOG%20VBAC.pdf

California Healthcare Foundation. (2014, Nov). A Tale of Two Births: High- and Low-Performing Hospitals on Maternity Measures in California. Retrieved from California Healthcare Foundation: http://www.chcf.org/publications/2014/11/tale-two-births

Guise, J.-M., Eden, K., Emeis, C., Denman, M., Marshall, N., Fu, R., . . . McDonagh, M. (2010). Vaginal Birth After Cesarean: New Insights. Rockville (MD): Agency for Healthcare Research and Quality (US). Retrieved from http://www.ncbi.nlm.nih.gov/books/NBK44571/

Friedman, A. M., Ananth, C. V., Prendergast, E., Alton, M. E., & Wright, J. D. (2015). Variation in and factors associated with use of episiotomy. JAMA, 313(2), 197-199. Retrieved from http://jama.jamanetwork.com/article.aspx?articleid=2089343

Kozhimannil, K. B., Arcaya, M. C., & Subramanian, S. V. (2014). Maternal Clinical Diagnoses and Hospital Variation in the Risk of Cesarean Delivery: Analyses of a National US Hospital Discharge Database. PLoS Med, 11(10). Retrieved from http://journals.plos.org/plosmedicine/article?id=10.1371%2Fjournal.pmed.1001745

Why cesareans are a big deal to you, your wife, and your daughter

surgery-surgical-instrumentsI hear a lot, “What’s the big deal about cesareans? What difference does it really make if you have a cesarean?” Of course, if a cesarean is medically necessary, then the benefits outweigh the risks. But in the absence of a medical reason, the risks of cesareans must be carefully considered.

“Once a cesarean, always a cesarean”

If a woman has a cesarean, she is very likely to only have cesareans for future births. This is because while 45% of American women are interested in the option of VBAC (1), 92% have a repeat cesarean (2). Let me say that another way. Only 8% of women with a prior cesarean successfully VBAC.

One might interpret this statistic to mean that planned VBACs often end in a repeat cesarean. However, VBACs are successful about 75% of the time (3-7). The VBAC rate is so low because of the women interested in VBAC, 57% are unable to find a supportive care provider or hospital (1). And I would argue further that even among the women who have a supportive care provider, those women are so bombarded by fear based misinformation masquerading as caring advice from friends and family, they have no chance.  It is shocking to learn how ill-informed both women planning VBACs and repeat cesareans are about their birth options even upon admission to the hospital.  There is a fundamental gap in our collective wisdom about post-cesarean birth options.

Cesareans make subsequent pregnancies riskier

What’s the big deal, right? Who cares if you have a cesarean without a medical reason?

Forget about the immediate risks to mom and baby that cesareans impose. Just set that all aside for a moment.  Much of the risk associated with cesareans is delayed.  Most people are not aware of the long term issues that can come with cesareans and how these complications impact the safety of future pregnancies, deliveries, and children.

It is a well-established fact that the more cesareans a woman has, the more risky subsequent pregnancies and labors are regardless if the mom plans a VBAC or a repeat cesarean.  This was discussed at great lengths during the 2010 National Institutes of Health VBAC conference and was one of the reasons why ACOG released their less restrictive VBAC guidelines later that same year.

Many moms chose repeat cesareans because they believe cesareans are the prudent, safest choice. The fact that cesareans, of which over 1,000,000 occur in the USA each year, increases the complication rates of future pregnancies is often not disclosed to women during their VBAC consult.

A four year study looking at up to six cesareans in 30,000 women reported a startling number of complications that increased at a statistically significant rate as the prior number of cesareans increased:

The risks of placenta accreta [which has a maternal mortality of 7% and hysterectomy risk of 71%], cystotomy [surgical incision of the urinary bladder], bowel injury, ureteral injury [damage to the ureters – the tubes that connect the kidneys to the bladder in which urine flows – is one of the most serious complications of gynecologic surgery], and ileus [disruption of the normal propulsive gastrointestinal motor activity which can lead to bowel (intestinal) obstructions], the need for postoperative ventilation [this means mom can’t breathe on her own after the surgery], intensive care unit admission [mom is having major complications], hysterectomy, and blood transfusion requiring 4 or more units [mom hemorrhaged], and the duration of operative time [primarily due to adhesions] and hospital stay significantly increased with increasing number of cesarean deliveries (8).

Because the growing likelihood of serious complications that comes with each subsequent cesarean surgery, including uterine rupture, this study concluded,

Because serious maternal morbidity increases progressively with increasing number of cesarean deliveries, the number of intended pregnancies should be considered during counseling regarding elective repeat cesarean operation versus a trial of labor and when debating the merits of elective primary cesarean delivery (8).

This is because the risks of placenta accreta and previa in particular increase at a very high rate after multiple cesareans (9).

The largest prospective report of uterine rupture in women without a previous cesarean in a Western country,” concurred:

Ultimately, the best prevention [of uterine rupture] is primary prevention, i.e. reducing the primary caesarean delivery rate. The obstetrician who decides to perform a caesarean has a joint responsibility for the late consequences of that decision, including uterine rupture (10).

“Well, I just plan on having two kids…”

Unfortunately, many women don’t think about these future risks until they are pregnant again. And we all know the great difference between intended and actual family size.

According to the CDC, 49% of American pregnancies are unintentional (11). Thus, these theoretical risks quickly and suddenly become a reality for hundreds of thousands of American women every year. How women birth their current baby has real and well-documented implications and risks for their future pregnancies, children, and health.

VBAC bans and emergency response

In light of these increasing risks, VBAC bans do not make moms safer (12). Hospitals are either prepared for obstetrical complications, like uterine rupture in moms who plan VBACs and placenta accreta, previa, and cesarean hysterectomies among moms who plan repeat cesareans, or they are not. It is hard to understand how hospitals can claim that they are simultaneously capable of an adequate response to cesarean-related complications and yet they are unable or ill-equipped to respond to complications related to vaginal birth after cesarean.  Especially in light of the fact that we know motivated hospitals currently offer VBAC even in the absence of 24/7 anesthesia (13).

A recent Wall Street Journal article discusses how hospitals are trying to create a standard response to obstetrical emergencies:

The CDC is funding programs in a number of states to establish guidelines and protocols for improving safety and preventing injury.  And obstetrics teams are holding drills to train doctors and nurses to rapidly respond to maternal complications. They are using simulated emergencies that include fake blood, robots that mimic physiologic states, and actresses standing in as patients (14).

Because hospitals vary so greatly in their ability to coordinate a expeditious response to urgent situations,

Vivian von Gruenigen, system medical director for women’s health services at Summa Health System in Akron, Ohio, advises that pregnant women discuss personal risks with their doctor and ask hospitals what kind of training delivery teams have to respond in an emergency. ‘People think pregnancy is benign in nature but that isn’t always the case, and women need to be their own advocates,’ Dr. von Gruenigen says.

Impact of VBAC on future births

Counter the increasing risks that come with cesareans to the downstream implications for VBAC. After the first successful VBAC, the future risk of uterine rupture, uterine dehiscence, and other labor related complications significantly decrease (15). Thus, family size must be considered as VBAC is often the safer choice for women planning large families.

Bottom line? I defer to two medical professionals and researchers:

“There is a major misperception that TOLAC [trial of labor after cesarean] is extremely risky” – Mona Lydon-Rochelle PhD, MPH, MS, CNM (16-17).

In terms of VBAC, “your risk is really, really quite low” – George Macones MD, MSCE (16-17).

Women deserve the facts

Women are entitled to accurate, honest data explained in a clear, easy to understand format (18). They don’t deserve to have the risks exaggerated by an OB who wishes to coerce them into a repeat cesarean nor do they deserve to have risks sugar-coated or minimized by a midwife or birth advocate who may not understand the facts or whose zealous desire for everyone to VBAC clouds their judgement (19-20).

If you would like to get the opinions of actual VBAC supportive medical professionals who support a woman’s right to informed consent, there are several obstetricians and midwives who you can talk to on the VBAC Facts Community.

Take home message

Cesareans are not benign and the more you have, the more risky your future pregnancies become regardless of your preferred mode of delivery.

Almost half of the pregnancies in America are unintentional.

If hospitals can attend to cesarean-related complications, they can attend to VBAC-related complications.

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1. Declercq, E. R., & Sakala, C. (2006). Listening to Mothers II: Reports of the Second National U.S. Survey of Women’s Childbearing Experiences. New York: Childbirth Connection. Retrieved from Childbirth Connection: http://www.childbirthconnection.org/article.asp?ck=10068

2. Osterman, M. J., Martin, J. A., Mathews, T. J., & Hamilton, B. E. (2011, July 27). Expanded Data From the New Birth Certificate, 2008. Retrieved from CDC: National Vital Statistics Reports: http://www.cdc.gov/nchs/data/nvsr/nvsr59/nvsr59_07.pdf

3. Coassolo, K. M., Stamilio, D. M., Pare, E., Peipert, J. F., Stevens, E., Nelson, D., et al. (2005). Safety and Efficacy of Vaginal Birth After Cesarean Attempts at or Beyond 40 Weeks Gestation. Obstetrics & Gynecology, 106, 700-6.

4. Huang, W. H., Nakashima, D. K., Rumney, P. J., Keegan, K. A., & Chan, K. (2002). Interdelivery Interval and the Success of Vaginal Birth After Cesarean Delivery. Obstetrics & Gynecology, 99, 41-44.

5. Landon, M. B., Hauth, J. C., & Leveno, K. J. (2004). Maternal and Perinatal Outcomes Associated with a Trial of Labor after Prior Cesarean Delivery. The New England Journal of Medicine, 351, 2581-2589.

6. Landon, M. B., Spong, C. Y., & Tom, E. (2006). Risk of Uterine Rupture With a Trial of Labor in Women with Multiple and Single Prior Cesarean Delivery. Obstetrics & Gynecology, 108, 12-20.

7. Macones, G. A., Cahill, A., Pare, E., Stamilio, D. M., Ratcliffe, S., Stevens, E., et al. (2005). Obstetric outcomes in women with two prior cesarean deliveries: Is vaginal birth after cesarean delivery a viable option? American Journal of Obstetrics and Gynecology, 192, 1223-9.

8. Silver, R. M., Landon, M. B., Rouse, D. J., & Leveno, K. J. (2006). Maternal Morbidity Associated with Multiple Repeat Cesarean Deliveries. Obstetrics & Gynecology, 107, 1226-32.

9. Kamel, J. (2012, Mar 30). Placenta problems in VBAMC/ after multiple repeat cesareans. Retrieved from VBAC Facts: http://vbacfacts.com/2012/03/30/placenta-problems-in-vbamc-after-multiple-repeat-cesareans/

10. Zwart, J. J., Richters, J. M., Ory, F., de Vries, J., Bloemenkamp, K., & van Roosmalen, J. (2009, July). Uterine rupture in the Netherlands: a nationwide population-based cohort study. BJOG: An International Journal of Obstetrics and Gynaecology, 116(8), pp. 1069-1080. Retrieved January 15, 2012, from http://onlinelibrary.wiley.com/doi/10.1111/j.1471-0528.2009.02136.x/full

11. National Center for Chronic Disease Prevention and Health Promotion, Division of Reproductive Health. (2012, Apr 4). Unintended Pregnancy Prevention. Retrieved from Centers for Disease Control and Prevention: http://www.cdc.gov/reproductivehealth/UnintendedPregnancy/index.htm

12. Kamel, J. (2012, Mar 27). Just kicking the can of risk down the road. Retrieved from VBAC Facts: http://vbacfacts.com/2012/03/27/just-kicking-the-can-of-risk-down-the-road/

13. Kamel, J. (2010, July 22). VBAC ban rationale is irrational. Retrieved from VBAC Facts: http://vbacfacts.com/2010/07/22/vbac-ban-rationale-is-irrational/

14.  Landro, L. (2012, Dec 10). Steep Rise Of Complications In Childbirth Spurs Action. Retrieved from Wall Street Journal: http://online.wsj.com/article/SB10001424127887324339204578171531475181260.html?mod=rss_Health

15. Mercer BM, Gilbert S, Landon MB. et al. Labor Outcomes With Increasing Number of Prior Vaginal Births After Cesarean Delivery. Obstet Gynecol. 2008 Feb;111(2):285-291. Retrieved from: http://journals.lww.com/greenjournal/Fulltext/2008/02000/Labor_Outcomes_With_Increasing_Number_of_Prior.6.aspx

16. NIH Consensus Development Conference. (2010). Vaginal Birth After Cesarean: New Insights. Bethesda, Maryland. Retrieved from http://consensus.nih.gov/2010/vbac.htm

17. Kamel, J. (2012, Apr 11). The best compilation of VBAC research to date. Retrieved from VBAC Facts: http://vbacfacts.com/2012/04/11/best-compilation-of-vbac-research-to-date/

18. Kamel, J. (2012, Dec 7). Some people think I’m anti-this/ pro-that: My advocacy style. Retrieved from VBAC Facts: http://vbacfacts.com/2012/12/07/some-people-think-im-anti-thispro-that-my-advocacy-style/

19. Kamel, J. (n.d.). Birth myths. Retrieved from VBAC Facts: http://vbacfacts.com/category/vbac/birth-myths

20. Kamel, J. (n.d.). Scare tactics. Retrieved from VBAC Facts: http://vbacfacts.com/category/vbac/scare-tactics/

Myth: VBACs should never be induced

Note: When I refer to a spontaneous labor, I mean a non-induced/augmented labor. Also, given that the risk of rupture increases with induction, a hospital is the best location for an induction.

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Many of the comments left at the Forced Cesarean mom story questioned the safety of inducing a VBAC mom. Many people believe that is it excessively dangerous and that VBACs should never been induced or augmented. This is just not the case.

Spontaneous labor is always preferable to induced or augmented labor but there are medical conditions that can necessitate the immediate birth of a baby. It’s nice for those women for whom vaginal birth is still an option to have a choice: gentle induction/ augmentation or repeat cesarean. Of course, reviewing the risks and benefits of available options, including doing nothing, is essential. Some women might be more comfortable scheduling a cesarean whereas others might want to give a gentle Pitocin and/or Foley catheter induction a go.

ACOG’s stance on inducing VBACs

The latest 2010 VBAC Practice Bulletin No. 115 produced by the American Congress of Obstetricians & Gynecologists (ACOG) asserts:

Induction of labor for maternal or fetal indications remains an option in women undergoing TOLAC [trial of labor after cesarean]… However, the potential increased risk of uterine rupture associated with any induction, and the potential decreased possibility of achieving VBAC, should be discussed… Misoprostol [Cytotec] should not be used for third trimester cervical ripening or labor induction in patients who have had a cesarean delivery or major uterine surgery.

Stuart Fischbein MD, a vaginal breech/twins and VBAC supportive Southern California OB, recently shared this on my Facebook page,

According to ACOG, prior low transverse c/section is not a contraindication to induction (other than the use of Misoprostol [Cytotec]) so a Foley balloon or Pitocin may be used safely in these women. The problem arises when a practitioner does not believe in doing inductions on women with prior c/section. Despite the evidence and the ACOG clinical guideline the reality is that many doctors will just not want to deal with it.

“Many doctors will just not want to deal with it” for a variety of reasons including experiencing a recent uterine rupture or lawsuit and pressure from hospital administrators or other OBs in their practice. It’s good to know from the beginning if your care provider is open to a gentle VBAC induction and under what conditions they would recommend induction. (See below for the Mayo Clinic’s reasons for induction.) This is why I suggest asking care providers when you first meet with them: “Under what circumstances would you induce a VBAC?” and “What induction methods do you use?”

Medical reasons for induction

While many women are induced for non-medical reasons, such as being pregnant for 40 weeks and one day, there are many medical conditions where induction is a reasonable option. According to the Mayo Clinic’s article Inducing labor: when to wait, when to induce dated July 23, 2011:

Your health care provider might recommend inducing labor for various reasons, primarily when there’s concern for your health or your baby’s health. For example:

  • You’re approaching two weeks beyond your due date, and labor hasn’t started naturally
  • Your water has broken, but you’re not having contractions
  • There’s an infection in your uterus
  • Your baby has stopped growing at the expected pace
  • There’s not enough amniotic fluid surrounding the baby (oligohydramnios)
  • Your placenta has begun to deteriorate
  • The placenta peels away from the inner wall of the uterus before delivery — either partially or completely (placental abruption)
  • You have a medical condition that might put you or your baby at risk, such as high blood pressure or diabetes

ACOG’s 2009 recommendations on induction lists the following reasons:

  • Abruptio placentae [placental abruption]
  • Chorioamnionitis [infection in your uterus]
  • Fetal demise [baby has passed away]
  • Gestational hypertension
  • Preeclampsia, eclampsia
  • Premature rupture of membranes
  • Postterm pregnancy [after 42 weeks]
  • Maternal medical conditions (eg, diabetes, mellitus, renal [kidney] disease, chronic pulmonary disease, chronic hypertension, antiphospholipid syndrome)
  • Fetal compromise (eg, severe fetal growth restriction, isoimmunization, oligohydramnios)

Big babies & going overdue

ACOG’s latest VBAC Pratice Bulletin No. 115 states that going over 40 weeks or suspecting a “big baby” should not prevent a woman from planning a VBAC. I suggest asking your care provider at your first appointment about what they would recommend doing if you go past 40 weeks, past 42 weeks, or if they believe your baby is large. They may suggest a cesarean, a gentle induction, or they be open to waiting for spontaneous labor. Then you decide how you feel about their answer. If you decide that their answer is not a good fit for you, you can weigh that against the responses of other VBAC supportive care providers in your area.

Uterine rupture rates in induced/augmented labors

There are two primary factors when looking at uterine rupture during an induction: the drug and the dose. Keep in mind that while the risk of rupture generally increases as the dosage increases, two women can respond very differently to the same dose of the same drug. According to JHP Pharmaceuticals, LLC, the manufacturer of Pitocin,

Oxytocin has specific receptors in the myometrium and the receptor concentration increases greatly during pregnancy, reaching a maximum in early labor at term. The response to a given dose of oxytocin is very individualized and depends on the sensitivity of the uterus, which is determined by the oxytocin receptor concentration.

Additionally, they assert that Pitocin should not be used for induction without medical indication:

Elective induction of labor is defined as the initiation of labor in a pregnant individual who has no medical indications for induction. Since the available data are inadequate to evaluate the benefits-to-risks considerations, Pitocin is not indicated for elective induction of labor.

Many women point to the fact that the Pitocin drug insert states, “Except in unusual circumstances, oxytocin should not be administered in the following conditions” and then lists “previous major surgery on the cervix or uterus including cesarean section.” However, a prior cesarean is not listed under contraindications and the drug insert is clear:

The decision [to use Pitocin in a woman with a prior cesarean] can be made only by carefully weighing the potential benefits which oxytocin can provide in a given case against rare but definite potential for the drug to produce hypertonicity or tetanic spasm.

The elevated risk of rupture due to induction has been documented in several studies. Landon (2004) found that spontaneous labors had a 0.4% rate of rupture. That increased 2.5 times for induced labors (1.0%) and 2.25 times for augmented labors (0.9%).

Landon further broke out rupture rates by type of induction:

  • 1.4% (N = 13) with any prostaglandins (with or without oxytocin)
  • 0% with prostaglandins alone
  • 0.9% (n = 15) with no prostaglandins (includes mechanical dilation with a foley catheter with or without oxytocin), and
  • 1.1% (N = 20) with oxytocin alone.

Overall, they found 0.7% of women experienced an uterine rupture with an additional 0.7% experiencing a dehiscence.

Landon (2004) did a great job in providing rates of rupture per drug, but we don’t know the dose used in the induced/ augmented labors that ruptured versus those that didn’t rupture.

ACOG quotes a couple studies in their 2010 VBAC Practice Bulletin (emphasis mine):

One study of 20,095 women who had undergone prior cesarean delivery (81) found a rate of uterine rupture of 0.52% for spontaneous labor, 0.77% for labor induced without prostaglandins, and 2.24% for prostaglandin induced labor. This study was limited by reliance on the International Classification of Diseases, 9th Revision coding for diagnosis of uterine rupture and the inability to determine whether prostaglandin use itself or the context of its use (eg, unfavorable cervix, need for multiple induction agents) was associated with uterine rupture.

In a multicenter study of 33,699 women undergoing TOLAC, augmentation or induction of labor also was associated with an increased risk of uterine rupture compared with spontaneous labor (0.4 % for spontaneous labor, 0.9% for augmented labor, 1.1% for oxytocin alone, and 1.4% for induction with prostaglandins with or without oxytocin) (4). A secondary analysis of 11,778 women from this study with one prior low transverse cesarean delivery showed an increase in uterine rupture only in women undergoing induction who had no prior vaginal delivery (1.5% versus 0.8%, P=.02). Additionally, uterine rupture was no more likely to occur when labor induction was initiated with an unfavorable cervix than with a favorable cervix (91). Another secondary analysis examined the association between maximum oxytocin dose and the risk of uterine rupture (94). They noted a dose response effect with increasing risk of uterine rupture with higher maximum doses of oxytocin. Because studies have not identified a clear threshold for rupture, an upper limit for oxytocin dosing with TOLAC has not been established.

Induced labor is less likely to result in VBAC than spontaneous labor (44, 47, 92, 99). There is some evidence that this is the case regardless of whether the cervix is favorable or unfavorable, although an unfavorable cervix decreases the chance of success to the greatest extent (91, 100, 101). These factors may affect patient and health care provider decisions as they consider the risks and benefits of TOLAC associated with labor induction.

Given the lack of compelling data suggesting increased risk with mechanical dilation and transcervical catheters, such interventions may be an option for TOLAC candidates with an unfavorable cervix.

The Guise 2010 Evidence Report is another excellent resource that reviewed VBAC research published to date. It talks extensively about uterine rupture in induced births on pages 58 – 69 and concluded (emphasis mine):

The strength of evidence on the risk of uterine rupture with pharmacologic IOL [induction of labor] methods was low due to lack of precision in estimates and inconsistency in findings. The overall risk of rupture with any IOL method at term was 1.5 percent [1 in 67] and 1.0 percent [1 in 100] when any GA [gestational age] is considered. Among women with GA greater than 40 weeks, the rate was highest at 3.2 percent [1 in 31]. Evaluation of the evidence on specific methods of IOL reveal that the lowest rate occurs with oxytocin [Pitocin] at 1.1 percent [1 in 91], then PGE2 [prostaglandin E2] at 2 percent [1 in 50], and the highest rate with misoprostol [Cytotec] at 6 percent [1 in 17]. These findings should be interpreted with caution as there was imprecision and inconsistency in the results among these studies. The risk of uterine rupture with mechanical methods of IOL is understudied. Other harms were inadequately reported to make conclusions. Relative to women with spontaneous labor, there was no increase in risk of rupture among those induced at term. However, the available evidence on women with induced labor after 40 weeks GA indicates an increased risk compared with spontaneous labor (risk difference 1.8 percent; 95 percent CI: 0.1 to 3.5 percent). The NNH [number needed to harm] in this group is 56 (for every 56 women greater than 40 weeks GA with IOL during a TOL [trial of labor], one additional rupture will occur compared with having spontaneous labor).

So the bottom line is: more large, good quality studies that control for induction are needed.

What is too risky?

As ACOG (2010) states in their latest Practice Bulletin:

Respect for patient autonomy supports the concept that patients should be allowed to accept increased levels of risk, however, patients should be clearly informed of such potential increase in risk and management alternatives.

I agree and believe that each individual woman has the right to informed consent and, together with her care provider, can make the best decision for her individual situation. I think it’s hard to argue that women seeking VBA2C, home birth, or unassisted birth should have the right to accept the elevated levels of risk that come with those decisions and yet say that the elevated risk that comes with induced VBACs is unacceptable.

Keep in mind that while the risk of rupture is higher in an induced VBAC, the risk is similar to the risk of rupture in a VBA2C (0.9% per Landon 2006). So it’s hard for one to support VBA2C and yet demonize a VBA1C induced for medical indication by saying the risk of rupture is to high.

It is also important to note that 90 out of 91 Pitocin induced TOLACs do not rupture (Landon, 2004 & Guise, 2010). So while the risk is generally higher in induced/ augmented labors, the overall risk is still low and occurs at a rate comparable to other obstetrical emergencies.

Myth: Most ruptures occur in induced/augmented labors

It’s imperative that women seeking VBAC understand that the single factor that increases their risk of uterine rupture the most is their prior cesarean section. And while having your labor induced/augmented does increase your risk of rupture, please do not believe the myth that a spontaneous labor provides complete protection from uterine rupture.

To disprove this myth, I direct you to “the largest prospective report of uterine rupture in women without a previous cesarean in a Western country” which found that most ruptures occur in spontaneous labors (Zwart, 2009). Zwart differentiated between uterine rupture and dehiscence and found (emphasis mine):

of the 208 scarred and unscarred uterine ruptures, 130 (62.5%) occurred during spontaneous labor reflecting 72% of scarred ruptures and 56% of unscarred ruptures.

It is interesting to note that 16% of unscarred ruptures (representing 4 unscarred women) and 9% of scarred ruptures (representing 16 scarred women) happened before the onset of labor (Zwart, 2009).

What I would do

If there was a medical reason for my baby to born (as detailed by the Mayo Clinic above), and it was the difference between a VBAC and a repeat cesarean, and I had a favorable Bishop’s score (download the app), I would consent to a foley catheter and/or low-dose Pitocin induction (not Cytotec or Cervidil).

If I was induced or augmented with Pitocin, I would be comfortable with continuous external fetal monitoring. Some hospitals do offer telemetry which is wireless monitoring giving you more freedom of movement. I’ve even seen telemetry in tube tops (naturally I can’t find a link to it now, if you have a link, can you leave a comment?) and units that can be worn in birth tubs. It’s good to call the hospital beforehand to determine what kind of telemetry monitoring units they offer and to confirm that it’s not lost in a closet.

Final thoughts

There is no doubt that Pitocin is overused in America and often results in unnecessary emergency cesareans. However, it’s important not to cloud the two issues: medically unnecessary inductions and inductions with medical indication. There are situations where induction/ augmentation are reasonable and can give the mom one last option before having a cesarean. Thankfully, a low-dose Pitocin and/or foley catheter induction “remains an option” in women planning a VBAC according to ACOG. I think that is a good thing.

Further reading

What can you do when your hospital bans VBAC?

Amber recently left this comment on the Quick Facts page:

i am pregnant for the second time my first child was delivered by c-section my goal is to have my second child natural but the obgyns in my area will not allow someone who has had a c-section to have a natural birth they said it is hospital policy what would you recommend?

And here is what people recommended: 

1. Let hospital administrators and the board of directors know.

Mamas that are passing on a hospital because of their VBAC policy, need to then write the hospital administrators and the boards of directors to tell them that they birthed at XXX Hospital instead of theirs because of their VBAC policy. Hospitals need to hear that they are losing births (aka $$$) because of their policies.

2. Find an ICAN chapter near you.

She needs to get in touch with her closest local ICAN chapter TODAY. They will know details on the exact situation in her area. She should not put stock in what one person tells her- there is a lot of misinformation and myth out there. She can find both a local chapter and information about fighting a VBAC ban at www.ican-online.org

3. Sign a waiver and exercise your legal right to refuse surgery.

I had a VBAC at a hospital where no doctor staff supported it but low and behold all the nurses were amazing! I went in at 5 cm and 3 hours later baby was in my arms. Strong support is a must – I had a midwife, my husband, mom and sister. Stay focused. Don’t sign anything- except the refusal of c/section form- get in there and push your baby out!

and . . .

I would encourage her to ask to see this policy & ask if she would be allowed to sign a waiver. Ask friends if anyone they know has VBAC’d there or at another area facility. I had an experience in my last VBAC where I was told of a “policy” that didn’t really exist except in that person’s mind.

and . . .

Under the right to informed decision making she has the right to say “no thank you”. Absent a court order for a cesarean they cant force her. I’m not a huge fan of the “show up pushing” crowd, but it may appeal to her. Or she could labor in a nearby hotel with a midwife or montrice to monitor the baby and then go in to the hospital at the last minute. Again, not a fan but we’re looking at options here.

and . . .

Regarding stories of VBAC-ban hospitals. I don’t have experience myself, as my VBAC was done with a CNM at a supportive facility – but I’ve attended a VBAC at a local hospital with a VBAC ban. Mama had a RCS [repeat cesarean section] scheduled (though she didn’t intend on going in) but went into spontaneous labor 6 days prior. She labored at home several hours until contractions were about 3 minutes apart. When we arrived and they realized she had a previous c/s, they began calling in a team to prep the OR.

The mama was beyond calm – and in the middle of labor – requested to speak with the staff. The nurses (there were maybe 4 in there?), the attending OB, and the anesthesiologist (who had already been paged for the spinal for surgery) were in her room (ready to wheel her to the OR). Between contractions, she quickly and quietly explained that she was aware it wasn’t typical policy to attend a VBAC, but she was there and it was their legal duty to treat her and she was exercising her legal right to refuse unnecessary surgery.

The nurses looked shocked, the anesthesiologist said something about he was clearly not needed, and the OB (who I swear was VBAC accepting but just was staffed at a VBAC-ban hospital) told her that she was correct, they had to treat her and couldn’t force her to do anything unless her baby was in danger but she’d need to sign quite a bit of paperwork documenting the situation. He had the most odd grin/smirk on his face while he said that as if to somehow thank her for having the nerve to stand up for herself. He left the room and we didn’t see him again until she was crowning.

I in no way, shape, or form feel that that scenario is typical of a VBAC-ban situation, but it was certainly enjoyable and entertaining to have experienced that with my client.

and . . .

I just refused the c-section at a VBAC ban hospital. With my first, I pushed for 4 hours, and he didn’t get past the 0 station (he was presenting transverse) — We lived too far away from the hospital for a homebirth at our own home, but I hired the homebirth midwife for concurrent care. She was going to monitor us at a hotel near the hospital for labor, but thankfully everything went so fast we just met her at the hospital. She served as doula there. I found out from an OB nurse that one of the OBs did support a woman’s right to refuse (though not enthusiastically). I knew I needed care I could trust, so that the only c-section I got was medically necessary. You can read where my midwife tells our story here.

You have every right to refuse an unnecessary c-section, I’d just HIGHLY recommend laboring out of the hospital, and having a doula or knowledgeable advocate with you!

and . . .

This is my advice for VBACing at a banned hospital –

– Sign your informed refusal ahead of time, and be aware that when presented with the risks of VBAC, it will majorly underplay RCS risks; it might be a good idea not to bring your husband to this appointment if he’s feeling nervous about VBAC. [Or have your husband read this article beforehand.]

– Don’t let them give you a late term ultrasound for anything other than a medical problem (in other words — refuse the late ultrasound for size)

– Plan to labor out of the hospital; use a monitrice if you are nervous about that, or a good doula

– Have a smart advocate with you at the hospital so you don’t have to fight any battles yourself and can just focus on laboring

– Get good prenatal care — I did acupuncture and chiropractic, and both of those people had offered to help me in labor if I needed; having that support and belief was very empowering, because my OB absolutely didn’t think we “could” VBAC

– Own your decision; don’t be wishy-washy… be stubborn… this is YOUR BODY. I had a personal mantra that I repeated to myself over and over, “I will only have a medically necessary c-section.”

– Learn ways to get through labor naturally; I really liked the strategies in “Birthing from Within” — even more than hypno or Bradley techniques

– Show up in advanced labor (I was complete when we got to the hospital)

– Know your personal hang-ups — I pushed for 4 hours with my son and am SO GLAD that I labored down in a small bathroom until my urge to push was really strong and spontaneous; I am so glad I wasn’t on the bed pushing for a long time, because this would have brought back too many bad memories and made me feel panicky, tired, and out of control. When I got on the bed to push, I was practically crowning. THAT was very empowering for a “failure to descend” mama

To bottom line – do what you have to to get the care you need, even with limited options; own your body and decision, and give yourself every advantage and tool that you can to help ensure success.

and a VBAC supportive OB who worked in a VBAC ban hospital says:

I’m supposed to tell patients that they have to go elsewhere if they want a VBAC, that they can’t stay in their own community, that they have to drive 50 miles. … I’m not supposed to tell them that they have the option of showing up in labor and refusing surgery. The hospital actually put in writing that I should avoid telling them that. They’re telling me to skew my counseling, and they have no shame in doing so.

4. Ask a different person at the hospital.

Remember that not everyone is knowledgeable about VBAC or a specific hospital’s VBAC policy, even if they work at that hospital.

I have heard an OB tell a mother that her only option was repeat cesarean because the hospital didn’t allow VBAC. The director of Maternal Child Health said it absolutely wasn’t true and gave her the names of VBAC friendly providers.

5. Find another hospital via the VBAC Policies by US Hospitals database compiled by ICAN.

Remember you are buying a service. Why pay for something you don’t want. Shop elsewhere.

6. Find another provider and ask these questions.

7. Birth in another city, county, or state.

Know what you’re comfortable with, hire a doula as well as a midwife or doctor especially if you have a hospital birth, and do your research so you know your rights and options. I’m currently about to “relocate” to Seattle at 37 weeks, from Juneau, AK where there is a hospital VBAC ban at our one hospital in town so I can try to have a VBAC in a more supportive environment. I didn’t think I wanted to fight the VBAC ban while in labor, I’d rather do my political activism in a clearer state of mind! It has been a stressful journey but I know I’m doing what’s right for me so I’m feeling really good about things now. I know this isn’t an option for many and a few women since the beginning of 2011 have refused repeat c/s at our hospital. Good luck!

and . . .

Go somewhere else. . . I traveled 40 mins for my vbac in 2010 because the 6 hospitals around here wouldn’t let them either.

and . . .

I even know a family who crossed state lines to have her baby the way she desired because her states laws wouldn’t allow her.

Joy Szabo said

I found a sane doctor 5 hours away. I got slightly famous for it, too.

and I’ve heard of women traveling to Mexico to VBAC at Plenitude with Dr. José Luis.

8. Consider a homebirth.

Fighting the hospital system while trying to push out a baby is not a simple task. Yes, a support team can be a big help. Personally, I felt more comfortable staying home than going to the hospital with my boxing gloves. It’s a personal choice and she’ll have to see what she’s most comfortable with. At the end of the day, I played out both options in my mind and went with the one that I felt most at peace with.

and. . .

Hello, my personal story in a nutshell… iatrogenically necessitated c/s with my first. For #2, it was a last minute change of plans… I’m a physician and I discovered through the grapevine that OB was planning to resection me without medical indication so #2 turned into planned HBAC. Homebirth VBAC successful with my second. The second was so beautiful, so peaceful, so uncomplicated!

9. Connect with resources for more ideas.

Stratton, B. (2006). 50 Ways to Protest a VBAC Denial. Retrieved from Midwifery Today: http://www.midwiferytoday.com/articles/50ways_vbac.asp

A good closing thought:

The term “will not allow” always bothers me. Perhaps they “won’t attend a VBAC” but they definitely can not stop you. Stand up for your rights. Show them the ACOG recommendation which is to allow a trial of labor! Seek out support. Call every OB you can think of. Look into a midwife. Hire a doula. You can do this.

Do you have more ideas?

Did you deliver at a VBAC ban hospital?

What was your strategy?

Are you a health care provider at a VBAC ban hospital and have some insight?

Two Doctors Encourage Native American Women to VBAC!

Here is another response to the statement dated December 2007 from Hastings Indian Medical Center explaining why they no longer offer VBAC.

Wow is this article amazing for being published in the post-2004 “anti-VBAC per ACOG” era, by two MDs no less! If your OB gives you the third degree about VBAC, you might want to give him a copy of this article. The tide against VBAC might be turning!

Dated February 2008, not only does it openly and explicitly encourage VBAC, but it also:

  • declares VBAC as the “safest option”
  • encourages efforts to “minimize the primary cesarean delivery rate”
  • asserts that cesareans increase the risk of “placenta accreta, increta and percreta” which “may be particularly difficult to address in a rural community hospital setting”
  • puts the high cesarean rate squarely on the shoulders of OBs: “Physician specific practices influence cesarean delivery rates”
  • notes that OB attitudes towards cesareans is the “largest stumbling block” in lowering the rate
  • concludes that, “An important ingredient in reducing cesarean delivery, either in nulliparous or parous women, is to place value on vaginal delivery”
  • supports “labor management strategies to reduce cesarean rates in the Native American population in the Oklahoma Area and nationwide”
  • questions why smaller hospitals state they can’t accommodate VBAC, yet offer maternity services, when there are other emergencies that occur during non-VBAC labors at a greater rate than uterine rupture
  • encourages hospitals to revaluate their policies and support VBAC
  • asserts that VBAC is successful 75% of the time
  • reaffirms that spontaneous VBAC labors are more successful (80.6%) than VBAC labors that are induced (67.4%) or augmented (73.9%)
  • reaffirms that women who are more than 4 centimeters dilated upon admission have greater VBAC success (83.8% vs. 66.8%)
  • found VBAC success can be had among women with “larger babies” (over 4000 grams or 8 lb, 12 oz) (62%) and women who are ‘overdue’ as defined as 41 weeks or more (64.8%).  I would personally take these odds over the 0% chance of VBAC success if you have a scheduled repeat cesarean!

Maybe the pendulum is finally swinging the other way and this will be the beginning of VBAC support for all women.

The emphasis below is mine.  Note that VBAC is referred to as ‘trial of labor after cesarean’ or TOLAC.

Leeman, Larry, MD, MPH and Eve Espey, MD, MPH. “Concern for rising Cesarean rates in Native American populations.” CCC Corner 6.2 (February 2008)

Concern for rising Cesarean rates in Native American populations

By Larry Leeman MD, MPH and Eve Espey MD, MPH

Editorial Note : The following is in response to a Point / Counterpoint discussion of trial of labor after cesarean (TOLAC) in rural hospitals, December CCC Corner*

We appreciate the willingness to engage in discussion about trial of labor after cesarean (TOLAC) availability and the approach to cesarean delivery at W. W. Hastings Hospital. Every facility faces unique factors in the decision to offer TOLAC services. However, we fear that the high total cesarean rate and lack of TOLAC services will ultimately result in worse perinatal outcomes considered from a population level.

Not only is vaginal birth after cesarean (VBAC) highly desired by many women, but it is preferable to a repeat cesarean delivery in certain women, including those with a single cesarean delivery who have had a successful vaginal birth before or after their cesarean delivery. Evidence suggests that such women should be encouraged to have a TOLAC particularly if they plan to have additional children. Given these data, anesthesia staff should be strongly encouraged to change their policy and offer 1 VBAC services in accordance with guidelines similar to those developed in the Northern New England Perinatal Quality Improvement Network (NNEPQIN). Ethically, it is difficult to justify withholding TOLAC when it is the safest option. If services were offered to this group of women, obstetrical and anesthesia staff could develop greater comfort with TOLAC and expand the local eligibility criteria.

Annual cesarean rates at some Indian Health facilities in Oklahoma are > 37% and short term rates over 40%, hence are above the recently published 2006 national rates for the total U.S population (31.1%), the Oklahoma state population (33.3%), and the US Native American population (27.5%) 2 We note that the Native American cesarean rate increased 1.5% from 2005 to 2006, almost double the 0.8% increase for the total US population. The rising cesarean rate is likely a reflection of both rising primary cesarean delivery rates and decreased vaginal birth after cesarean delivery.

Given the limited availability of TOLAC services for women in the Oklahoma service area, efforts should be made to minimize the primary cesarean delivery rate. The decision to lower the threshold for primary cesarean delivery as evidenced by an acceptance of the high rate and an unwillingness to look at physician specific factors will result in higher adverse outcomes in future pregnancies 3, particularly when combined with the lack of TOLAC services. Women in the Hastings area with primary cesareans can be anticipated to have cesareans in all future births placing them at increased risk for placenta accreta, increta and percreta 5. These complications of abnormal placentation may be particularly difficult to address in a rural community hospital setting.

Although Healthy People 2010 does not include a recommendation for the total cesarean rate due to varying patient factors, it recommends that efforts be made to decrease the primary cesarean rate to 15% in women who are giving birth for the first time 6. ACOG similarly recommends that comparative cesarean delivery rates for populations, hospitals, or physicians should be based on the subgroup of nulliparous women with term singleton vertex gestations 7. We would be interested in seeing the rate for this population at those affected facilities in Oklahoma Area.

We worked in at the Gallup Indian Medical Center (GIMC) and Zuni-Ramah Hospitals in the 1990s and continue to work with Native populations in Albuquerque and New Mexico. Our study of the population based CS rate in Zuni-Ramah in the 1990s demonstrated a 7.3% cesarean rate despite an incidence of diabetes and hypertensive disorders well above national rates 8. Physician specific practices influence cesarean delivery rates 9. We believe that the cesarean delivery review initiated at GIMC in the early 1990s was important in identifying factors in patient management that can result in a high cesarean rate.

An important ingredient in reducing cesarean delivery, either in nulliparous or parous women, is to place value on vaginal delivery. The attitude that “None of the physicians in our department are concerned with our cesarean delivery rate” may prove the largest stumbling block in developing strategies more consistent with national goals.

We suggest that the maternity care providers in Hastings present the evidence for improved maternal outcomes in women with prior vaginal delivery to their anesthesia colleagues and make TOLAC available at least for this group of women. Addressing the high total (and presumably) primary cesarean rates will require analysis of the indications and physician specific patterns. Given the increasing evidence for adverse outcomes with multiple repeat cesareans and the limited ability of community hospitals to address problems with placenta accreta, increta and percreta, we support labor management strategies to reduce cesarean rates in the Native American population in the Oklahoma Area and nationwide.

OB/GYN CCC Editorial comment:

An argument for better teamwork: Trial of labor after cesarean in Indian Country

First, I want to thank the leaders of the Indian Health Midwives listserv for raising these important issues, as this discussion was originally begun in the Midwives Corner feature. Though the current discussion revolves around Indian Health facilities, it is reflective of most small rural hospitals and increasingly some larger urban facilities.

Next, the availability of the trial of labor after cesarean option is really a ‘systems’ issue not just a problem confined to midwives or physicians. To decrease the long term morbidity and mortality associated with cesarean rates that now exceed 40%, we need to approach this issue systematically. Specifically, how can we engage our Indian Health administrative staff to foster an environment whereby anesthesia, pediatric, and nursing services work together with the provider staff to decrease excess morbidity in Native women.

Should you offer vaginal birth after cesarean delivery at your facility?

Should your referral facility be offering VBAC?

Let’s put some of the above issues into perspective.

What are just a few of the risks that you should currently handle very well:

Incidence per 100
Shoulder dystocia 0.2 -3.0
Cord Prolapse 0.14 – 0.62
Abruptio placenta, overall 0.4 – 1.3
Abruptio placenta, severe – stillbirth 0.12
Placenta previa, third trimester 0.1 to 0.4
Placenta accreta, overall 0.18
Placenta accreta / previa unscarred 1 – 5
Placenta accreta / previa with 1 Ces Del. 11 to 25
Placenta accreta / previa with 2 Ces 35 to 47
Placenta accreta / previa with > 3 Ces 50 to 67
Post partum hemorrhage 1 – 5
Trauma 7

In all but one of the above cases the incidence of these obstetric emergencies is actually increasing each year.

If you can’t provide VBAC because of the 0.5% risk of uterine rupture, then should your facility be offering intrapartum care at all? [emphasis theirs]

If you work at a facility that can not develop a rapid response for a clinical issue like symptomatic uterine rupture in a VBAC setting, which happens ~0.5 percent of the time, then your facility, should re-evaluate its ability to manage obstetric intrapartum care.

Taken on their own individual merit, most of the above common urgencies and emergencies occur more frequently than 0.5 percent. Taken as an aggregate, the risks above far outweigh the risks of VBAC. Now seeing the above risks, if you feel you need to re-evaluate offering obstetric intrapartum care because the above risks, then please contact me as soon as possible.

For those facilities that feel they are able to continue to offer obstetric intrapartum care within the risk environment above, then I would suggest a program of emergency obstetric drills, pan-ALSO** certification for all nurses and providers, and an ongoing quality assurance.

Each of the last three national Indian Women’s Health and MCH Conferences has devoted significant blocks of lecture time and workshops to improve systems of care and specific content updates. (Link to Meeting Lecture notes below)

Lastly, there seems to be some confusion as some providers at times combine the risk of a TOLAC sequela vs the relative success of a vaginal birth in TOLAC. These are two separate issues that need to be discussed with our patients separately for a fully informed consent.

1.) Success of vaginal delivery

Overall the rate of successful vaginal delivery in TOLAC is actually quite high, often in the range of 75% in the general population, and much higher success rate in the AI/AN population at 85-90% over the years.

A previous successful VBAC is probably the best predictor of future success; about 90 percent of such women deliver vaginally with trial of labor. By comparison, women delivered abdominally for dystocia are least successful, although approximately two-thirds are delivered vaginally.

Among the previous dystocia group, the success rate is higher if cesarean delivery was performed in the latent phase of labor and lower if performed after full dilatation. Within the former group, 79% of women who originally had surgery while still in the latent phase of labor had a successful trial of labor, compared with 61% of patients who had an arrest of dilation in the active phase of labor and 65% of those who had an arrest of descent. (Duff et al Obstet Gynecol 1988 Mar;71 (3 Pt 1):380-4.)

Multivariate logistic regression analysis identified as predictive of TOL success: previous vaginal delivery (OR 3.9; 95% CI 3.6-4.3), previous indication not being dystocia (CPD/FTP) (OR 1.7; 95% CI 1.5-1.8), spontaneous labor (OR 1.6; 95% CI 1.5-1.8), birth weight <4000 g (OR 2.0; 95% CI 1.8-2.3), and Caucasian race (OR 1.8, 95% CI 1.6-1.9) (all P < .001).

The overall TOL success rate in obese women (BMI > or = 30) was lower (68.4%) than in nonobese women (79.6%) (P < .001), and when combined with induction and lack of previous vaginal delivery, successful VBAC occurred in only 44.2% of cases. (Landon et al The MFMU Cesarean Registry: factors affecting the success of trial of labor after previous cesarean delivery. Am J Obstet Gynecol. 2005 Sep;193(3 Pt 2):1016-23. )

The combination of previous cesarean for dystocia, no previous vaginal delivery, and induced labor had a particularly poor prognosis in the Flamm system, e. g., fewer than 50 percent of such women achieved a successful TOL.

A decision analysis model favored TOL if the chance of success was >50 percent and if the desire for additional pregnancies was 10 to 20 percent. (Mankuta et al Am J Obstet Gynecol 2003 Sep;189(3):714-9.)

Trial of labor success rates: obstetrical and historical factors

Characteristic VBAC success, percent Odds ratio (95% CI)
Previous CD indication
Dystocia 63.5 0.34 (0.30-0.37)
NRFWB [nonreassuring fetal well-being] 72.6 0.51 (0.45-0.58)
Other 77.5 0.67 (0.58-0.76)
Malpresentation* 83.8 1.0
Previous vaginal delivery
Yes* 86.6 1.0
No 60.9 0.24 (0.22-0.26)
Previous VBAC
Yes* 86.6 1.0
No 64.4 0.21 (0.19-0.23)
Labor type
Induction 67.4 0.50 (0.45-0.55)
Augmented 73.9 0.68 (0.62-0.75)
Spontaneous 80.6 1.0
Admit cervical dilation
< 4 66.8 0.39 (0.36-0.42)
≥ 4* 83.8 1.0
Birth weight (g)
< 2500 (5.5 lbs) 77.2 1.14 (0.89-1.47)
2500-3999* (5.5 lbs – 8.8 lbs) 74.9 1.0
≥ 4000 (over 8.8 lbs) 62.0 0.55 (0.49-0.61)
Gestational age (week/day)
37 0/7-40 6/7* 75.0 1.0
≥ 41 64.8 0.61 (0.55-0.68)

All overall P values are <.001; for categorical characteristics, only the comparison of birth weight <2500 g to 2500 to 3999 is not significant (P=.33).
CI: confidence interval; CD: cesarean delivery; VBAC: vaginal birth after CD; NRFWB: nonreassuring fetal well-being.
* Women with this characteristic served as the reference group.
Modified from: Landon, MB, Leindecker, S, Spong, CY, et al. Am J Obstet Gynecol 2005; 193:1016.

Flamm scoring system tool

Variable Point value
Age under 40 years 2
Vaginal birth history
Before and after 1st cesarean 4
After 1st cesarean 2
Before 1st cesarean 1
None 0
Reason other than FTP for 1st cesarean 1
Cervical effacement at admission
> 75 percent 2
25 percent – 75 percent 1
< 25 percent
Cervical dilation 4 cm or more at admission 1
Score (percent) VBAC successful
0 to 2 49
3 60
4 67
5 77
6 89
7 93
8 to 10 95

FTP: failure to progress.
Data from: Flamm, BL, Geiger, AM. Obstet Gynecol 1997; 90:907.

2.) Risks:

Numerous risk factors have been cited for uterine rupture during labor in women with a previous CD. However, these risk factors are not consistent across studies, which are generally hampered by small numbers of patients with uterine rupture. Unfortunately, no single factor or combination of risk factors is sufficiently reliable to be clinically useful for prediction of uterine rupture.

Purported risk factors include maternal age greater than 30 years, induction of labor, more than one prior CD, postpartum fever, interdelivery interval less than 18 to 24 months, dysfunctional labor, and one layer uterine closure. Within this framework of incomplete data the New England Perinatal Quality Improvement Network (NNEPQIN) has developed a system to appropriately manage the risks.

Low Risk Patient:

  • 1 prior low transverse cesarean delivery
  • Spontaneous onset labor
  • No need for augmentation
  • No repetitive FHR abnormalities
  • Patients with a prior successful VBAC are especially low risk.
    (However, their risk status escalates the same as other low risk patients)

Medium Risk Patient:

  • Induction of labor
  • Pitocin augmentation
  • 2 or more prior low transverse cesarean deliveries*
  • < 18 months between prior cesarean delivery and current delivery

High Risk Patient:

  • Repetitive non-reassuring FHR abnormalities not responsive to clinical intervention. /li>
  • Bleeding suggestive of abruption
  • 2 hours without cervical change in the active phase despite adequate labor

* NB: ‘Two prior uterine scars and no vaginal deliveries’ is listed as a circumstance under which trial of labor should not be attempted by the American College of Obstetricians and Gynecologists ACOG Practice Bulletin No. 54, ‘Vaginal birth after previous cesarean delivery’.

Here is a suggested management system per NNEPQIN

Low risk

Notify Pediatrics, Anesthesia, and operating room crew of admission
OB/GYN on campus during active phase
Perinatal Guidelines of Care, ACOG, observed

Medium risk

Notify Pediatrics, Anesthesia, and operating room crew of admission
Operating room on campus in active phase or other plan if crew is busy

High risk

OB/GYN, Anesthesia, and Pediatrics available
No other acute care responsibilities
Rapid decision to incision

Please see the Midwives Corner and Oklahoma Perspective, below, for further discussion on this topic. A complete discussion of risk, benefits, and systems issues is available in the Perinatology Corner module: Vaginal Birth after cesarean http://www.ihs.gov/MedicalPrograms/MCH/M/PNC/VB01.cfm

Other Resources:

Vaginal birth after cesarean (VBAC) in rural hospitals Counterpoint: David Gahn, M.D.

http://www.ihs.gov/MedicalPrograms/MCH/M/obgyn1207_Feat.cfm#MidWives

New England Perinatal Quality Improvement Network (NNEPQIN)

http://www.nnepqin.org/

Indian Health Meeting lecture notes

http://www.ihs.gov/MedicalPrograms/MCH/F/lecNotes.cfm

OB Emergency Drills in Indian Country

http://www.ihs.gov/medicalprograms/mch/F/documents/OBEmergDrills.ppt

2007 Indian Health Data Summary (Deliveries, VBAC rates, etc…)

http://www.ihs.gov/MedicalPrograms/MCH/F/documents/DataTally81107.doc

** ALSO = Advanced Life Support in Obstetrics

http://www.aafp.org/online/en/home/cme/aafpcourses/clinicalcourses/also.html

Leeman and Espey References:

1 Cahill AG, Stamilio DM, ADibo AO, Pelpert JF, et al. Is vaginal birth after cesarean (VBAC) or elective repeat cesarean safer in women with a prior vaginal delivery? Am J Obstet Gynecol 2006; 195:1143-7.

2 Hamilton BE, Martin JA, Ventura SJ. Births: Preliminary data for 2006. National vital statistics reports; vol 56 no 7. Hyattsville, MD: National Center for Health Statistics. 2007.

3 Kennare R, Tucker G, Heard A, Chan A. Risks of adverse outcomes in the next birth after a first cesarean delivery. Obstet Gynecol 2007; 109:270-6.

4 Silver RM, Landon MB, Rouse DJ, Leveno KJ, Spong CY, Thom EA, et al. Maternal morbidity associated with multiple repeat cesarean deliveries. Obstet Gynecol 2006;107:1226–32.

5 Getahun D, Oyelese Y, Salihu HM, Ananth CV. Previous cesarean delivery and risks of placenta previa and placental abruption. Obstet Gynecol 2006;107:771–8.

6 U.S. Department of Health and Human Services. Healthy People 2010. 2nd ed. With Understanding and Improving Health and Objectives for Improving Health. 2 vols. Washington, DC: U.S. Government Printing Office, November 2000.

7 American College of Obstetricians and Gynecologists, Task Force on Cesarean Delivery Rates. Evaluation of cesarean delivery. Washington, DC: American College of Obstetricians and Gynecologists, 2000.

8 Leeman L, Leeman R. A Native American community with 7% cesarean delivery rate: Case mix analysis, risk factors and operative indications. Ann Fam Med. 2003;1:36-43.

9 Luthy DA, Malmgren JA, Zingheim RW, Leininger C. Physician contribution to a cesarean delivery risk model. Am J Obstet Gynecol. 2003;188:1579-85

Cahill AG, Stamilio DM, ADibo AO, Pelpert JF, et al. Is vaginal birth after cesarean (VBAC) or elective repeat cesarean safer in women with a prior vaginal delivery? Am J Obstet Gynecol 2006; 195:1143-7.