I’ve been meaning to post this post for ages, but was never able to finish it during the school year last year. All of this comes from the research project that I worked on last year for 2 semesters as part of my research class, and even though I had to radically alter the goal and purpose of my research proposal in the end, along the way I had the opportunity to do some of the research I was really interested in doing in the first place, and it definitely needs to be shared. This is rather a long post, and it gets somewhat technical in places, but bear with me; a lot of the information here can help you fend off an unnecessary induction or cesarean, so it’s well worth reading. And with that, here we go:
Premature rupture of membranes (or prelabor rupture of membranes, aka PROM) occurs when a woman’s water breaks before she actually goes into active labor. It can happen to women at any point in their pregnancy, and when it happens to women who are still preterm, the danger to herself and her baby is much higher, as are the risks of infection (and many studies have demonstrated that in fact, preterm PROM, aka PPROM, is often caused by infection in the first place). However, the majority of PROM occurs in women who are at term gestation (37+ weeks)—90% of all cases, in fact (Zamzami, 2005), and it’s pretty common, too: PROM at term occurs in 8% of all births. (Hannah et. al., 1996)
In our hospitals today, there is sort of an unspoken rule—let’s call it the 24-Hour Rule. It goes something like this: if you haven’t delivered your baby within 24 hours of breaking your water, something is going to have to be done. In many cases, this something is induction, and in many cases, waiting a full 24 hours before inducing is something that never happens. Providers are often way too impatient and antsy for that, and will generally talk a woman into induction long before the 24 hours has passed. Many providers have the policy of immediately inducing a woman with PROM, either by using prostaglandin gels like cervadil followed by IV oxytocin (pitocin), or by just starting on the pit right away. The rationale for this type of management (often called active management) stems from research that was done in the 1960s (Shubeck, 1966; Rusell & Anderson, 1962) which found that the longer a woman was ruptured, the greater the chance of infection, chorioamnionitis (an acute infection of the chorion, which is part of the placenta), and maternal and/or fetal sepsis.
These early studies advocated immediate induction, and were the beginning of active management. The idea that the length of PROM is responsible for maternal infection is something which has sort of been hard-wired into modern obstetrical practice right now, and in my own experience, I have seen the 24-Hour Rule in effect many a time. Providers often use it to justify the need for an induction or augmentation, i.e. “we need to get your labor moving along, because you’ve been ruptured now for 8 hours…12 hours…18 hours…and you’re still not in active labor”, and as studies have shown, inductions and augmentations, especially for PROM, often lead to cesarean (Mozurkewich & Wolf, 1997; Grant et. al., 1992; Tan & Hannah, 2001). I have seen this deadline held over women’s heads before, and in my most humble opinion, it does absolutely NOTHING to help a woman relax, labor effectively, and have a vaginal delivery. (What’s that old Bradley joke about telling a man he better orgasm soon or else his penis will have to be cut apart to get to the sperm? No pressure, now!)
The thing is…the research from the ’60s, which forms the basis of the 24-Hour Rule, has more holes in it than swiss cheese. For one thing, these studies were retrospective, instead of prospective, which means that they relied on going back and looking at records after the births had already occurred, and never tried to control for any of the gazillion variables that might have affected these birth outcomes other than PROM. Similarly, these early studies were non-randomized, meaning that there might have been selection bias at play which could have muddied the findings. Additionally, both term and preterm pregnancies were mixed together when examining the effects of PROM, which seriously confounds results since preterm infants are much more susceptible to infection, and as I mentioned above, preterm PROM often occurs because of infection in the first place (McGregor & French, 1997). These studies had very imprecise definitions for infection, and the management protocols used were neither uniform or clearly discussed. And of course, NICUs and antibiotic therapy have improved so much in the past 40 years that many of the babies that died of infection in these early studies probably wouldn’t have died if they had been born today. So, as you can see, the studies from the 1960s had a lot of problems, and the fact that modern obstetrical practices are still based in part on the findings in these studies is an even BIGGER problem.
What have more recent studies shown? Well, many studies have shown that strict adherence to active management is often unnecessary, and in some cases, does more harm than good (seems to be a repeating theme when you start to look at obstetrical research—funny, that. And here is where it gets very technical. I’m putting the rest of this behind a cut, for those of you who are interested.)
Kappy et. al. (1979) challenged the 24-Hour Rule, asserting that active management unnecessarily increased the cesarean section (CS) rate, and that expectant management of PROM could reduce the rising CS rate while at the same time keep infection to a minimum. Using a prospective, nonrandomized, observational design, the rates of infection were studied in 110 women with preterm PROM and 78 women with term PROM. In both groups, patients were managed expectantly until they either delivered or signs and symptoms of infection appeared, at which point the patients were induced. No digital examinations were performed on patients until they were in active labor, and no tocolytic agents or prophylactic antibiotics were given unless a patient showed signs and symptoms of infection, at which point the patient was induced. Kappy et. al. found that only 13% of all term women had clinical signs of infection at delivery, and only 3% had chorioamnionitis. There were no maternal deaths, and no neonatal deaths attributed to sepsis. Unlike earlier studies, Kappy et. al. separated preterm and term births, used standardized and clearly defined indicators of PROM (sterile speculum exam to detect vaginal pooling, followed by positive nitrazine tests and microscopic ferning to confirm rupture) and standardized and precise definitions of infection (clinical signs confirmed by positive blood, sputum, spinal or placental cultures). The weaknesses of this study included its nonrandomized design, the fact that no effort was made to control for infectious risk factors such as GBS, and only infants showing clinical signs of infection were cultured. Nevertheless, Kappy et. al. were able to conclude that â€œthe conservative approach in the term pregnancy with PROMâ€¦seems to decrease the incidence of cesarean sections without an appropriate increase in the infectious morbidityâ€.
Duff et. al. (Duff, Huff & Gibbs, 1984) supported these results with a randomized control trial that demonstrated that â€œexpectant management resulted in a lower frequency of both cesarean delivery and intrapartum infection thanâ€¦the practice of immediately inducing laborâ€. In this study, 134 women with PROM were assigned either to an oxytocin induction group or to an expectant management group where they were observed as inpatients until the onset of labor. The researchers found a statistically significant increase in the number of cesarean deliveries and intra-amniotic infections in the induction group versus the expectant groupâ€”20% versus 7%, p<0.05, for cesarean deliveries, and 17% versus 4%, p <0.05, for intra-amniotic infections. This study used a non-blinded, randomized, prospective design (in other words, one of the strongest study designs you can use, and the “gold standard” for research), standardized definitions for maternal and neonatal infection, and uniform and clearly defined indications for cesarean section. Women participating in the study were from a homogenous population of carefully screened low-risk women at term without complicating risk factors such as diabetes, postdates pregnancy, meconium-stained fluid, hypertensive disorders, intraamniotic infection or malpresentation. However, again no mention was made of GBS status, potential bias could have occurred in the use of two distinct management teams, not all neonates were screened for sepsis, and the use of antibiotics during management was not specified.
A study conducted by Grant et. al. (1992) also found that expectant management significantly lowered the cesarean rate while at the same time posing no additional infectious risk to women or infants. In this study, 444 term primigravidas with PROM were blindly randomized to either an immediate induction group or induction the following morning (9-33 hours later, depending on when the woman arrived on the unit). It was found that there were fewer cesareans in the group that was allowed to wait 9-33 hours before induction (11.1% versus 17.4%, p = 0.06) with no significant increase in the rates of neonatal or maternal infection. Itâ€™s also interesting to note that women in the immediate induction group were more likely to ask for epidural anesthesia (70.3% versus 57.3%, p < 0.005), which supports the idea that induction leads to increased demand for epidurals, and that epidurals lead to increased cesarean rates.
The largest study to date, the TERM PROM study (Hannah et. al., 1996), examined 5041 women from 72 centers throughout Canada, Israel, Australia and the UK with PROM at term who were randomized to one of four groups: immediate induction with oxytocin (induction-oxytocin); immediate induction with vaginal prostaglandin gel first, followed by oxytocin if active labor had not started (induction-prostaglandin gel); expectant management for up to 4 days unless signs of infection or fetal distress were noted, followed by oxytocin induction if labor had not started after four days (expectant-oxytocin); and expectant management for up to 4 days, followed by induction with prostaglandin gel (expectant-prostaglandin). The study protocol was standardized and well-defined, and the randomization process was blinded (i.e. a very rigorous study design). Vaginal exams were discouraged; however, approximately one third of the women, equally divided among all four groups, received vaginal exams during the initial cervical assessment. Approximately 78% of the women in both expectant management groups went into labor spontaneously within 4 days of PROM and did not require induction. The researchers found no differences in the rate of neonatal infections or cesareans, but an increase in maternal infectious morbidity was noted in the women of the expectant management groups, with 8.6% of the expectant groups developing clinical chorioamnionitis versus 4% in the immediate induction groups.
Unlike earlier studies, a similar number of babies in all four groups were sampled and cultured for neonatal sepsis, regardless of what management group their mothers had been assigned to. Overall, this study presented a very strong case for arguing that immediate induction does not increase the cesarean rate, and that expectant management may increase maternal infection rates. Nevertheless, it still had a few weaknesses. For one thing, multiparas were pooled with nulliparas, and there was no standardization of Bishopâ€™s score (cervical ripeness); 6-15% of the women had ripe cervices, versus 29-54% which were considered unripe, and in 33-65% of the women, the cervical status was unknown. Additionally, the researchers stated that â€œdigital vaginal examinations were avoided,â€ but the expectant management groups had considerably more digital vaginal exams than the immediate induction groups. This is very important to note, given that digital vaginal exam after PROM has been found to be an independent risk factor for maternal and fetal infection.(Shutte et. al., 1983; Lenihan, 1984)
Even more recent studies (Zanzami, 2005) have found that in the absence of other obstetric and maternal or fetal risk factors, PROM at term is not an additional risk factor on its own. “Expectant management of PROM at term enhances a patient’s chance of normal delivery without an incrase in fatal and/or maternal morbidity.”
Now, this is not to say that other studies haven’t found the contrary to be the case. For example, Wagner et. al. (1989) found an increase in infection rates in babies born to women with PROM who had been managed expectantly versus actively, although this study also found that the number of vaginal exams performed increased the infection rate (which other studies have confirmed). Rydhstrom & Ingemarsson (1991) found no difference in the cesarean rates in a randomized trial between active management and expectatant management, and Akyol et. al. (1999) actually found that the cesarean rate was lower in the immediate induction group of their study when compared to the expectant management group who were randomized to induction after 24 hours had passed. However, it’s important to note that this increase in cesarean rate was in a group of women who had already failed to go into spontaneous labor within 24 hours. The majority of women will go into labor within 24 hours, so inducing those who didn’t might imply other variables at work which would make induction particularly unsuccessful.
My thoughts on the subject? If your water breaks and your labor doesn’t start right away, that’s fine: 8-12% of all women experience this problem, and it happens most often at term. If the fluid is clear and you can feel the baby moving, call your provider by all means and discuss your options with her, but try to stay home for as long as possible! Go for a walk, bake some cookies, scrub out the bathtub, do some yoga, try to get those contractions to kick in (just don’t have sex, now that your membranes are ruptured). Most women will go into labor on their own within 24 hours, and so long as NO digital vaginal exams are performed (i.e. using fingers; a sterile speculum exam is somewhat better, but still isn’t 100% risk-free), the risks of infection are low. If your provider urges an induction, ask for more time; studies have shown that inductions for PROM often don’t work that well, and women who are induced have a higher risk for developing an infection or having a cesarean (Zanzami, 2005; Hannah et. al., 1996), in part because once the induction process begins, vaginal exams and other interventions which increase the rate of infection, like internal monitoring, are often done.
Talk with your provider about giving your body AT LEAST 12 (and preferably 24) hours to get going on its own, and chances are very good that it will. If, after 24 hours you’re still not in active labor, don’t panic; about 15-20% will not do so within 24 hours (Kappy et. al. 1979). In a clinical trial that measured a 12-hour expectant management regimen versus a 72-hour regimen, the rates of infection, chorioamnionitis and neonatal morbidity were the same in both groups. (Shalev et. al, 1995) In other words, you can probably wait up until 72 hours, so long as no signs and symptoms of infection occur (although your risk of infection does marginally increase the longer youâ€™re ruptured, especially after 24 hours). Also, keep in mind that one of the side effects of an epidural is fever! One of the warning signs of infection is a rising temperature, but if you’ve just had an epidural, it could be from the epidural, and not really an infection at all—especially if your provider has kept his/her fingers out of your vagina! (Goetzl, et. al. 2001)
(Having just issued all of this advice, though, please go read my Quick Disclaimer before you go forth holding my word as gospel. I’m not a midwife! I’m a student, and I have NO idea what your personal situation might be. Each labor and birth is unique, full of a million and one variables, and needs to be handled individually by a health care provider you trust.)
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