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The New GBS Cochrane Review: A Hot Mess!

The Cochrane CollaborationAdvocates for evidence based care feel our ears perk up when we hear about a new Cochrane systematic review. Cochrane Review = Evidence! Right? Indeed, systematic reviews represent the top of the “evidence pyramid” and Cochrane systematic reviews are the gold standard for their rigor and transparency. A Cochrane review can even conclusively settle important clinical controversies.

But sometimes Cochrane reviews leave us with more questions than answers.

Last week, the Cochrane Library released a systematic review evaluating the effectiveness of intrapartum antibiotics for known maternal group B streptococcal (GBS) colonization. And it’s a hot mess.

The four included trials that compared IV antibiotics with no treatment in labor collectively had only 500 participants, which we automatically know is far too small to find statistically significant differences in a condition that affects 1 in 2000 newborns, and results in death or long-term complications even less frequently. But small sample sizes were the least of the problems here. The reviewers noted several other problems with the trials:

  • In one study, researchers tracked their findings and halted the trial as soon as a significant difference was found (favoring treatment with antibiotics). This is a blatant form of bias – it is like flipping a penny until you get heads 5% more often than you got tails. If you keep flipping long enough (or stop flipping soon enough) you’ll be able to find that 5% difference simply by chance.
  • In the same study, researchers changed to a different statistical test that allowed them to achieve statistical significance with their data, when the originally planned (and more appropriate) test would have produced a nonsignificant finding.
  • None of the studies used placebos, so women, care providers, and hospital staff knew which women received antibiotics and which did not. This may have altered treatment of the women or the babies, possibly in ways that would make no antibiotics appear safer (for instance, avoiding or delaying membrane rupture in a woman who is GBS+ but not getting antibiotics).
  • One study excluded women who developed fevers in labor. GBS colonization can cause maternal fever and newborn sepsis, so excluding these cases makes no sense.
  • Some women included in the studies were likely GBS negative because methods used to determine GBS status were inadequate
  • Outcomes were poorly defined.
  • Data on a substantial proportion of women and babies were missing.
  • Groups were mysteriously differently sized.
  • Need I go on?

The Cochrane reviewers, in my opinion, did a respectable job with what they had, but what they had was garbage and as the saying goes, “Garbage in, garbage out.” You can’t make reliable conclusions out of a bunch of bad research, even if you’re a Cochrane reviewer.

So what were the findings?

Three trials, which were around 20 years old, compared ampicillin or penicillin to no treatment and found no clear differences in newborn deaths although the occurrence of early GBS infection in the newborn was reduced with antibiotics.

More, better research is needed, but the Cochrane reviewers are not optimistic:

Ideally the effectiveness of intrapartum antibiotics to GBS colonized women to reduce neonatal GBS infections should be studied in adequately sized double blind controlled trials. The opportunities to conduct such trials have likely been lost as practice guidelines have been introduced in many jurisdictions. (p. 11)

Source: Centers for Disease Control and Prevention. http://www.cdc.gov/mmwr/preview/mmwrhtml/rr5111a1.htm

Source: Centers for Disease Control and Prevention. http://www.cdc.gov/mmwr/preview/mmwrhtml/rr5111a1.htm

In the meantime, women should be aware that other evidence, albeit not from randomized controlled trials, suggests that antibiotic treatment reduces deaths from early onset GBS disease in newborns. According to the Centers for Disease Control and Prevention, a steady decline in GBS disease has been seen in individual institutions, in the whole U.S. population, and in other countries as antibiotic use has risen. But these population-level data cannot tell us whether antibiotics or some other factor  caused the decline.

What other advice can we share with women?

  1. Be aware that antibiotics are not harmless. Severe allergic reactions are possible, and antibiotic use in labor can result in thrush (candida infection) which causes painful breastfeeding and sometimes early weaning. We do not know other possible harmful effects because they have never been studied adequately or at all.
  2. No study confirms the effect of labor practices on GBS infection in newborns, but here we can use our common sense. Care providers should avoid or minimize sweeping/stripping membranes before labor, breaking the bag of waters, vaginal exams, and other internal procedures, especially those that break the baby’s skin and can be a route for infection. These include internal fetal scalp electrodes for fetal heart rate monitoring and fetal blood sampling.
  3. Keep mothers and babies skin-to-skin after birth. This exposes the baby to beneficial bacteria on the mother’s skin, facilitates early breastfeeding, and lowers the likelihood that the baby will exhibit signs or symptoms that mimic infection, such as low temperature or low blood sugar, which could cause the need for blood tests or spinal taps to rule out infection.

Citation: Ohlsson A, & Shah VS (2009). Intrapartum antibiotics for known maternal Group B streptococcal colonization. Cochrane database of systematic reviews (Online) (3) PMID: 19588432

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  1. July 30th, 2009 at 10:08 | #1

    I am never skeptical of anything in the Cochrane database. I’m glad you posted this.

  2. July 30th, 2009 at 12:02 | #2

    This is probably one of the biggest reasons I started this blog! We get so excited for evidence, but sometimes the evidence is junk. So I want to help people sort out the good from the bad from the ugly. Cochrane reviews can go either way. Sometimes they really are the pinnacle of evidence, and often they just package together a bunch of bad trials and crown them with the “stamp of approval” of the Cochrane Collaboration. A pet peeve of mine!!

  3. avatar
    jennifer
    July 30th, 2009 at 12:52 | #3

    No wonder care providers have had such a hard time basing practice on evidence — there isn’t any to speak of. I am curious about one thing: antibiotic use can cause thrush? Could it also contribute to prolonged mastitis? And why is that? A friend had interpartum antibiotics for GBS+, and she has fought mastitis for the entire 12 weeks of her son’s life; I just wondered if there might be a link. Of course, the medical answer for mastitis is antibiotics, which she has avoided after the first dose. Any thoughts?

  4. July 31st, 2009 at 06:38 | #4

    Antibiotics can cause thrush because they knock out bacteria, including the beneficial bacteria that keep yeast growth at bay. My understanding is that thrush can lead to mastitis, probably because trauma to the nipple (cracks, bleeding, etc.) offer a route for bacteria to get inside. I imagine that a woman who had antibiotics, especially if she had multiple doses (used in longer labors) or a broad-spectrum alternative to penicillin (used in women who are allergic to penicillin) might end up with mastitis cases that are harder to treat. I know that some providers recommend probiotics to women and/or babies exposed to antibiotics for GBS prevention. Probiotic supplements replenish the beneficial bacteria, and evidence is building for their use in NICUs with babies on prolonged courses of antibiotics. To my knowledge, probiotics have not been studied as a means of preventing antibiotic-related thrush.

    Any breastfeeding professionals out there have other thoughts?

  5. July 31st, 2009 at 22:30 | #5

    the antibiotics will also kill off some of mom’s good bacteria which allows bad bacteria to get more of a foothold.

    one of my biggest fears about intrapartum antibiotic use is that all those good bacteria are supposed to be transferred to the baby during passage through the birth canal. c-section birth, or vaginal with antibiotics reduce the transfer, and then lack of breastfeeding exacerbates the bacterial imbalance even further.

    there’s a lot we don’t know about how your bacterial colonization primes your immune system for _life_ and even if doing the antibiotics reduces GBS infections at birth, we may be trading that for increased rates of allergic conditions later in life, some of which can be life-threatening themselves – anaphylaxis, asthma, etc.

    i was GBS+ for my first birth, and received a single dose of antibiotics 3 hours before the birth – he was fast! with my second i declined to test or treat. i took a course of probiotics in the last month of pregnancy, attended quickly to yeast infections throughout pregnancy (symptom of vaginal flora out of balance), and went through pregnancy and the entire birth without vaginal exams or other internal procedures.

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