“Acupuncture can increase the chances of getting pregnant for women undergoing fertility treatment by 65%,” according to The Guardian’s news pages.
The Times, The Daily Telegraph and BBC News covered the story and quoted Edward Ernst, a professor of complementary medicine, who cautioned that the effect might be due to a placebo effect caused by the women expecting acupuncture to work. He said that the expectation might cause them to relax which would improve pregnancy rates.
The study behind this story is a systematic review which combined the results of “high quality” studies on acupuncture, rates of pregnancy and live birth in women undergoing in vitro fertilisation (IVF). Although the methods used by this study are robust, some possible biases cannot be ruled out. Studies that have negative results are less likely to be published and may therefore not have been included.
When interpreting the 65% increase in pregnancy rates, it should be remembered that the differences in pregnancy rates were quite small. The results actually mean that in order to achieve one additional successful pregnancy, 10 women would need to be treated with acupuncture. The cost associated with lack of effect for the other nine women is something to be considered by individuals and health care providers.
Finally, the study found that the additional benefit of acupuncture depended on how successful IVF was overall. Where pregnancy rates were high, acupuncture had little benefit.
Dr Eric Manheimer, Grant Zhang, Laurence Udoff and colleagues from the University of Maryland School of Medicine, Georgetown University School of Medicine, Washington and the University of Amsterdam, Holland carried out the research.
Funding was provided by the National Centre for Complimentary and Alternative Medicine of the US National Institutes of Health. The study was published in the peer-reviewed: British Medical Journal.
The study was a systematic review of randomised controlled trials that compared needle acupuncture given within one day of women receiving IVF with sham (fake) treatment or no treatment at all. The researchers searched for published literature in databases and conference proceedings for studies that compared acupuncture given within one day of IVF treatment versus sham acupuncture (or no treatment). They assessed the quality of 108 potentially relevant studies they found, and of these, included seven trials in their analysis.
Only studies in which pregnancy had been confirmed (either by presence of gestational sac or heartbeat on ultrasound), ongoing pregnancy beyond 12 weeks gestation (confirmed through ultrasound), or a live birth, were included. The researchers also only included studies in which acupuncture needles were inserted into traditional meridian points (groups of points thought to have an effect upon a particular body part).
The researchers used meta-analysis (a statistical technique) to pool the studies. They were particularly interested in the difference in rates of pregnancy between women who received acupuncture and those who did not.
The seven studies that the researchers included in their analysis were all randomised controlled trials. In six of the studies, an acupuncture session was given just before the fertilised embryo was implanted back into the mother and another straight after. One trial involved acupuncture only after implantation. Two studies gave a third session during different phases of the process.
The authors reported that IVF with acupuncture increased the odds of pregnancy by 65% (according to early evidence on ultrasound), increased the odds of ongoing pregnancy by 87% (according to ultrasound evidence of pregnancy at 12 weeks) and increased the odds of a live birth by 91% compared with IVF on its own.
When the researchers only looked at the three studies that showed similar rates of pregnancy to women in the UK, they found that acupuncture did not increase rates of pregnancy with IVF.
The researchers conclude that their results suggest that acupuncture given with embryo transfer, improves rates of pregnancy and live birth in women who are undergoing in vitro fertilisation.
The results of this review suggest that acupuncture has a positive effect of pregnancy rates when given with IVF. An interpretation of the 65% benefit quoted by the papers must be considered in light of the fact that they represent relatively small absolute benefits considering that the rates of pregnancy in the non-acupuncture groups were high.
A systematic review is the strongest research method because it reduces the possibility that the effects are due to bias or chance. Complementary medicine needs more reviews like this.