Les essais cliniques d'acupuncture sans groupe témoin en obstétrique : une approche alternative de l'expérience française en utilisant l’OPC (critères objectifs de performance)
Il peut être difficile et parfois contraire à l'éthique de recruter des patients du groupe contrôle dans les essais cliniques randomisés (ECR). Le concept de « critère objectif de performance » (OPC ou « objective performance criteria ») est utilisé par la FDA américaine (Food and Drug Administration) pour simplifier le processus d'autorisation de commercialisation de certains dispositifs médicaux (prothèses valvulaires cardiaques, stents carotidiens, etc.) sans compromettre l'intégrité scientifique requise par sa mission de sécurité en santé publique. L'OPC représente un des critères issus de la littérature publiée et/ou d'autres sources de bases de données fiables. C’est un nombre/taux fixe déterminant la performance en remplacement du groupe contrôle, utilisé comme comparateur dans les essais à bras unique lorsque la randomisation s’avère difficile ou impossible. La pratique de l'acupuncture en obstétrique est de plus en plus répandue en médecine occidentale, en particulier pour atténuer certaines complications liées à la grossesse. Si l’aiguille d’acupuncture est assimilée à un dispositif médical, le concept OPC pourrait être appliqué pour évaluer l'efficacité de l'acupuncture.
Dans cet article, nous présentons deux exemples d’essais cliniques basés sur le concept OPC, menés dans deux maternités en France dans le cadre de mémoires pour valider le DIU d’Acupuncture obstétricale à l’Université de Lille, France. Pour le premier essai, l’objectif est d’évaluer les effets de RP6 (sanyinjiao) sur la relaxation du périnée lors de l'expulsion du fœtus. Dans le deuxième essai, l’action de la puncture de RP6 (sanyinjiao) et de RM16 (huangshu) sur la troisième étape de la délivrance a été étudiée.
Dans le premier essai réalisé en 2011 à l’hôpital Jeanne de Flandre (Lille, France), 54 primipares (para 1) ou bipare (para 2) ont été incluses. Les déchirures périnéales causées par l'accouchement par voie vaginale servent de critère d'efficacité. Ce critère a été comparé aux données 2010 d’un registre du même hôpital, comportant 2 216 patientes présentant les mêmes caractéristiques que celles de l’essai.
Dans le deuxième essai clinique, 29 femmes enceintes de l’Hôpital Paul Gellé (Roubaix, France) ont été incluses du 1er Octobre 2012 au 31 Janvier 2013. Les critères d'évaluation ont été comparés aux valeurs obtenues à partir d’une revue Cochrane.
Le recours à l’OPC présente plusieurs avantages par rapport à la méthode classique utilisée dans les ECR : plus petit échantillon, comparateurs standardisés, moindre coût, gain de temps, logistique plus facile. Toutefois, la détermination d'un OPC n’est pas toujours un exercice simple : problèmes liés à des valeurs historiques, validité des données, progrès dans la pratique de la médecine, essai à bras simple, biais de sélection. L’OPC doit être envisagé lorsque la randomisation en double aveugle est problématique. Il pourrait représenter une alternative acceptable et scientifiquement valable pour déterminer l'efficacité de l'acupuncture.
Acupuncture clinical trials without a control group in Obstetrics: a French experience alternative approach using OPC (objective performance criteria)
Tuy Nga Brignol*1, Jean-Marc Stéphan1,2,3, Alain Verta4
- MD, ASMAF – EFA (Association Scientifique des Médecins Acupuncteurs de France – Ecole Française d’Acupuncture)
- Course Coordinator of Obstetrics Acupuncture Diploma - Lille 2 University (France)
- Lecturer - Rouen Medicine School – Rouen University (France)
- MD, California (USA)
It may be difficult and, sometimes, unethical to recruit patients for the control arm in clinical trials (CT). The OPC (objective performance criteria) concept is used by the US Food and Drug Administration (FDA) to simplify the process of marketing authorization for some medical devices such as prosthetic heart valves, carotid stents, without compromising the scientific integrity required by its mission of public health safety. The OPC is a criteria based on published literature and/or other sources of reliable registries. It is a fixed number/bar for performance in lieu of control, used as a comparator in single arms trials when randomization is impractical or impossible. Acupuncture use in obstetrics has been increasing in Western medicine, especially to alleviate complications of pregnancy. If needles are considered as a medical device, the OPC concept may be valuable for demonstrating the efficacy of acupuncture.
In this paper, we report two examples of CT based on OPC concept, conducted by midwives in two maternity hospitals in France, for obtaining the Obstetric Acupuncture Diploma from the University of Lille 2, France. They aimed to assess the effects of SP6 (sanyinjiao) on perineal relaxation during fetal expulsion, and the effects of SP6 (sanyinjiao) and KD16 (huangshu) on the third stage of deliverance.
In the first trial, 54 primiparous (para 1) or biparous (para 2) women from Jeanne de Flandre Hospital (Lille, France) were included in 2011. The efficacy endpoint was the perineal tears caused by the vaginal delivery. It was compared with a 2010 registry from the same hospital including 2,216 patients with similar characteristics.
The second trial conducted in Paul Gellé Hospital (Roubaix, France) from October 1, 2012 to January 31, 2013 included 29 pregnant women. The endpoints were compared with the standard norm derived from published clinical trial results, and reviewed by the Cochrane Collaboration.
OPC use offers several advantages: smaller sample, standardized comparator, less cost, time-saver, easier logistics. However the determination of an OPC is not always a simple exercise: issues related to historical controls, validity of data, advances in the practice of medicine, single arm trials selection bias. OPC should be considered when randomization and double-blindness are problematic, and could represent an acceptable and scientifically valid alternative to determine the efficacy of Acupuncture.
Key-words: acupuncture - obstetrics - perineal tears - deliverance - postpartum hemorrhage - objective performance criteria - single-armed clinical trial - non-randomized controlled design.
In 1997, the U.S. Congress passed a law called "The Food and Drug Administration Modernization Act of 1997". The aim was to improve the authorization process to market medical devices, that is to say somehow alleviate the process to promote patient access to new technologies while respecting safety standards . Concretely, the FDA considers alternatives to randomized clinical trial [2,3] in particular testing protocols using as control groups non-competing groups such as historical controls (e.g. literature, patient records ) as objective performance criteria (OPC).
For some investigational medical devices (e.g. replacement heart valves, carotid stents), the US Food and Drug Administration (FDA) has allowed the approval process to include single arm clinical studies, and the control group has been replaced by expected standard results known as “objective performance criteria” (OPC) without compromising the scientific integrity required by its mission of public health safety [4,5,6,7,8,9].
The OPC is a criteria derived from published literature and/or other sources of reliable data or registries. It is used as a comparator in single arms trials where randomization is impractical or impossible. It should reflect the current level of care and should be updated periodically.
Conducting a double-blind randomized controlled trial (RCT) to demonstrate the efficacy of Acupuncture against placebo is challenging. If acupuncture needles are considered as a medical device, the methodology OPC (Objective Performance Criteria) used by the FDA for some medical devices approval could be used as a valid scientific alternative to show efficacy of Acupuncture.
In 2011, this concept of OPC was proposed by TN Brignol and P. Verta as an alternative methodology for Acupuncture clinical trials, at ICMART XIII World Congress (International Council of Medical Acupuncture and Related Technique) .
An article explaining this concept was published in 2011 in the French Journal “Acupuncture & Moxibustion” .
Over the last decade, complementary and alternative medicine (CAM) has been widely used in maternity practice all over the world. Women from different cultural backgrounds prefer the use of specific CAM modalities. Maternal consideration of fetal in addition to personal well-being play an important role in approaches to maternal medical care. According to studies from Germany and Sweden, acupuncture use among obstetric (OB) patients rates in the 4% to 13% range [12, 13].
In this paper, we present a brief introduction to the use of OPC (Objective Performance Criteria) as an alternative to double-blind RCTs. Then we report the application of the OPC concept in two clinical trials performed in 2011 and 2012 by midwives for obtaining the Obstetric Acupuncture Diploma from the University of Lille 2, France [14, 15].
Application of OPC in Acupuncture clinical trial on perineal relaxation during fetal expulsion
In France, since 2009, the practice of acupuncture by midwives is legal provided that they hold the Diploma of Obstetric Acupuncture delivered by Universities in France.
- Patients and Method
In 2011, two midwives from Jeanne de Flandre Hospital in Lille (France) used the OPC methodology for evaluating the effects of SP6 (sanyinjiao) puncture on perineal relaxation during fetal expulsion.
Fifty-four primiparous (para 1) or biparous (para 2) pregnant women participated in the trial. The inclusion criteria were: a scarred uterus (those who underwent a cesarean section during their first pregnancy and had not given birththrough the vagina), vertex presentation, and with a gestational period ≥ 37 weeks (gestational age calculated from the first day of the mother’s last menstrual period). The exclusion criteria included: multiple pregnancies (twins or triples), breech presentation, gestational period < 37 weeks, multiparous women. The efficacy endpoint was the perineal tears caused by the vaginal delivery.
The needles were inserted bilaterally at SP6 (sanyinjiao), when the cervix was in complete dilation, or immediately or within a few minutes, even just before the expulsive efforts.
The results were compared with data from a reliable registry that served as a substitute to the traditional control group. It was the 2010 database (DB 10) of “Jeanne de Flandre Hospital” in Lille (France), collecting data about the same population than the study: para 1 and para 2 women with previous caesarean section (n = 2,216 patients).
For a high birth weight greater than 3,500 g (about 7.71 £), known to be a high risk factor for perineal tears during vaginal delivery, in DB 10, only 37.4% of patients have preserved an intact perineum after delivery (vs 48% in theAcupuncture Group of the study). No complex perineal tear in the Acupuncture Group was found (vs 4.20% in DB 10). In the Acupuncture Group, there were 16% of simple tear vs 35.2% in DB 10. On the other side, episiotomieswere higher in the acupuncture group than DB 10 (36% vs 23.2%). (Figure 1).
Figure 1. Assessment of the perineum according to fetal weight.
Another risk factor for perineal tears is an infant’s head circumference greater or equal to 35cm (about 13.78 inch). More than half (58.33%) women who gave birth to a baby with head circumference greater than 35 cm have preserved an intact perineum after childbirth in the acupuncture group (vs 44.55% in the DB10 group). (Figure 2). On the other side, episiotomies in the acupuncture group were higher than DB 10 (36% vs 23.2%). (Figure 1).
A bias may exist concerning a higher frequency of episiotomy in the acupuncture group. In the acupuncture group of 54 patients, there were 29 patients without instrumental delivery, 21 patients requiring instrument assisted delivery and 4 patients were excluded from the study due to caesarean section at the end of the labor. The use of forceps, vacuum extractor or a combination of both was respectively 38.1%, 44.28%, and 19%. These cases of instrumental birth generated a significant percentage of episiotomy, respectively 87%, 56% and 50%. But percentages and types of instrumental delivery in BD10 were unknown, less instrumental delivery could explain the higher number of episiotomy in our trial.
However, the difference was more significant if only childbirth from primiparous was considered: 47% of intact perineum in BD10 versus 72% in the acupuncture group.
These results showed that acupuncture has sufficiently relaxed the perineum to prevent severe perineal tears.
Figure 2. Assessment of the perineum according to infant’s head circumference.
3. Limitations of the study
The study was not randomized; therefore known and unknown bias could have influenced results.
Application of OPC in Acupuncture clinical trial on the third stage of labor
The trial was conducted by two midwives at Paul Gellé Hospital Maternity (Roubaix, France) from October 1, 2012 to January 31, 2013.
The third stage of labor starts from the birth of the infant to delivery of the placenta and membranes. It is composed of three phases: placenta separation, placenta descent, placenta expulsion. If the placenta fails to be expelled within half an hour after delivery of the infant, the condition is called retained placenta. A prolonged third stage of labor is considered to be a risk factor for postpartum hemorrhage.
The postpartum hemorrhage is a serious complication of childbirth that may involve life-threatening to the mother (first cause of maternal death). To prevent this issue, 5 IU oxytocin is injected in a systematic manner, even for patientswithout particular risk. Few studies exist in the literature about the effect of acupuncture on delivery of the placenta [16, 17, 18].
The two midwives contacted a dozen maternity hospitals in France (Strasbourg, Rouen, Lille, Brest, Paris, Lens, etc.), but also in Canada. After telephone conversation with midwives of these hospitals, they learned that acupuncture is not or is rarely used for the third stage of labor. The reasons were lack of time and trouble to choose the most suitable points.
2. Patients and Method
In this OPC type study, the two points SP6 (sanyinjiao) and KD16 (huangshu) were selected. They were punctured as soon as possible after cord clamping.
Twenty nine pregnant women were included. The endpoints of the study are: time between infant birth and placenta expulsion; decrease of bleeding, decrease of postpartum hemorrhage, number of artificial delivery of the placenta.
The endpoints were compared with the standard norm derived from published clinical trial results, and reviewed by the Cochrane Collaboration , serving as a substitute to the traditional control group.
a. Delay between the birth of the infant and delivery of the placenta
In spontaneous delivery of the placenta, the time is estimated less than 10 minutes. This value is the same in the OPC trial as the one found in the Cochrane Database 2001, revised in 2004 . According to the literature, it is necessaryto act if the delivery did not take place after 30 minutes. In this sample of patients who benefited from the acupunctural method, the longest delivery is 13 minutes, with an average time of 7min 23sec. There is no statistically significant difference between the delivery promoted by acupuncture and the delivery promoted by oxytocin (χ2 test, p> 0.05). Therefore the use of acupuncture is as effective as pharmacologic method to reduce the length of the third stage of labor.
b. Amount of blood loss and number of postpartum hemorrhage
The Cochrane Collaboration in 2004 and updated in October 2009 (seven RCTs, n> 3,000)  indicates fewer postpartum hemorrhage (clinically characterized by a amount of blood loss equal to or greater than 500 ml) when oxytocin is used in preventive measure (relative risk (RR) for blood loss greater than 500 ml = 0.50; confidence interval (95% CI = 0.43 to 0.59) compared to no treatment. Furthermore, the average amount of blood loss in this OPC trial was 374 mlversus 548 ml in the control group reported by the Cochrane Collaboration. In this sample of 29 patients, the average amount of blood loss in immediate postnatal is 210 ml. One patient presented a hemorrhage with blood loss estimated to 550 ml. (Figure 3).
Figure 3. Average amount of blood loss (210 ml); for one among the 29 patients: 550 ml.
c. Number of artificial delivery of the placenta
Many practitioners feared to promote retained placenta by injecting oxytocin in order to enhance uterine retraction. According to the Cochrane Collaboration, there is no increase of retained placenta in patients who have received oxytocin. Similarly, in this small study, no retained placenta was found in the 29 patients who benefited from the acupunctural method.
This study showed that acupuncture is beneficial on the delivery of the placenta. The results must be confirmed in a randomized controlled trial with a larger number of participants. If the upcoming clinical trial is based on OPC concept, an update of the latest data of the Cochrane Collaboration in 2013  and 2015  is needed.
An approach based on the OPC methodology may represent an acceptable and scientifically valid alternative to determine the efficacy of Acupuncture. OPC may be considered when disease natural history of the disease is well known, patient population well described, in case of extensive experience with the acupuncture treatment, stable and well known standard of care, no significant new questions of safety and effectiveness, and expectation of significant positive treatment effect.
It may be appropriate to use OPC when standard of care therapy is well established, great deal is known about the natural history of the disease, underlying patient population is well described and stable (not much variability), extensive clinical history and experience with treatment type are known, and no apparent new concerns regarding effectiveness.
Consensus among clinical communities and expectation of significantly positive treatment effect are required too.
Advantages of OPC
The OPC use offers several advantages over randomized clinical trials: smaller sample size surrogate for control group (as compared to RCT), standardized comparator for future trials, reduced cost, shortened time to completion, simpler logistic, saving time and money.
However the determination of an OPC is not a simple task. It requires rigorous and scientifically valid methodologies. An OPC should be established by a multidisciplinary team of Traditional Chinese Medicine (TCM) practitioners, and Occidental physicians in cooperation with statisticians.
A detailed analysis of publications in peer-review journals provides a threshold value (OPC), a sort of consensus on the efficacy rate of allopathic treatments currently recognized, and should be followed by a detailed analysis on how it was derived in a peer-review journal. Collaboration with a statistician can determine the adequate sample size for the clinical trial to show whether the efficacy of acupuncture is higher, lower or equal to the allopathic treatment.
An OPC must reflect the current level of care and must be periodically re-evaluated.
It is necessary for TCM practitioners to participate in TCM consensus conferences to determine OPC for each disease or symptom, in conjunction with allopathic medical practitioners and/or published results in current Western medicine practice.
Limitations of OPC
Using OPC does not mean standards can be relaxed. The trial must be well designed: intensive resource to develop the OPC, problems on agreeing to the final OPC value.
- OPC may inherit all problems seen with historical controls.
Valid historical control requires: a recent study with the same treatment; same eligibility criteria, workup, and evaluations; prognostic factors completely known and are the same in both treatment groups; no unexplained factors leading one to expect different results.
OPC needs for periodic/constant review and update. It is necessary to reassess its value after each relevant trial. OPC must reflect contemporary medical practice (temporal bias).
- OPC may inherit all the problems associated with non-concurrent control: severe and unknown selection bias; significant challenge with missing data; problems with validity of data and analysis.
Close attention must be paid to inclusion/exclusion criteria (assumption of identical populations: group of patients with same condition, demographics, and prognostic values).
It is difficult to interpret the effects of sham needling and the extent to which such approaches can be used as valid controls in clinical trials. It has been shown that slight touch of the skin stimulates mechanoreceptors coupled toslow conducting unmyelinated (C) afferents, inducing a “limbic touch”' response resulting in emotional and hormonal reactions .
Sham acupuncture interventions are often associated with moderate nonspecific effects.
RCT‘s. Comparing real acupuncture with sham acupuncture presents small power. According to Linde et al. , the differentiation between specific effects of acupuncture and non-specific effects (placebo) required the recruitment of 800subjects in a double-blind randomized controlled trial in order to obtain a power of 80%, and a standardized mean difference (SMD) 0.2 for a specific outcome measure.
OPC concept has the advantage of not using minimal, superficial, sham, or “placebo” acupuncture for the control group.
Challenges remain in the process to demonstrate the efficacy of acupuncture, despite the emergence of evidence-based medicine . A more applicable and innovative research methodology that can reflect the effectiveness of acupuncture is needed, for improving future research into this integrative intervention, and CT’s based on OPC concept are worth developing.
To date, the gold standard for evaluation of a treatment is RCT with high methodological quality and high power, which can provides the highest level of scientific evidence. It would be interesting to add OPC methodology in the recommendations of grades, especially when blinding is difficult. A combined approach using a multidisciplinary team incorporating considerations of efficacy, effectiveness and qualitative measures, will strengthen the evidence base for acupuncture .
The OPC is a criteria based on published literature (meta-analyzes) and/or reliable registries OPC may be considered when disease natural history is well known, patient population well described, in case of extensive experience with acupuncture treatment, stable and well known standard of care, no significant new questions of safety and effectiveness, and expectation of significant positive treatment effect. The OPC use offers several advantages over randomized clinical trials: smaller sample size, standardized comparator for future trials, reduced cost, shortened time to completion, simpler logistic.
However the determination of an OPC is not a simple task. It requires rigorous and scientifically valid methodologies. An OPC should be established by a multidisciplinary team of Traditional Chinese Medicine (TCM) practitioners, and Western physicians in cooperation with statisticians.
OPC concept could represent an acceptable and scientifically valid alternative to determine effectiveness of acupuncture. Acupuncturists should consider this methodology when randomization and double-blindness are problematic.
CAM: complementary and alternative medicine
CI: confidence interval
CT: clinical trial
FDA: Food and Drug Administration
ICMART: International Council of Medical Acupuncture and Related Technique
OPC: objective performance criteria
RCT: randomized control trial
RR: relative risk
SMD: standardized mean difference
TCM: Traditional Chinese Medicine
US: the United States
The authors declare that they have no competing interests.
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To cite: Brignol TN, Stéphan JM, Verta A. Acupuncture clinical trials without a control group in Obstetrics : a French experience alternative approach using OPC (objective performance criteria). Acupuncture & Moxibustion (online). Feb 2016. Available from: URL: https://meridiens.org/acuMoxi/Quinzeun/Brignol_OPC.pdf