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Acupuncture as prophylaxis for menstrual-related migraine: study protocol for a multicenter randomized controlled trial
Trials volume 14, Article number: 374 (2013)
Menstrual-related migraine is a common form of migraine affecting >50% of female migraineurs. Acupuncture may be a choice for menstrual-related migraine, when pharmacological prophylaxis is not suitable. However, the efficacy of acupuncture has not been confirmed. We design and perform a randomized controlled clinical trial to evaluate the efficacy of acupuncture compared with naproxen in menstrual-related migraine patients.
This is a multicenter, single blind, randomized controlled clinical trial. A total of 184 participants will be randomly assigned to two different groups. Participants will receive verum acupuncture and placebo medicine in the treatment group, while participants in the control group will be treated with sham acupuncture and medicine (Naproxen Sustained Release Tablets). All treatments will be given for 3 months (menstrual cycles).
The primary outcome measures are the change of migraine days inside the menstrual cycle and the proportion of responders (defined as the proportion of patients with at least a 50% reduction in the number of menstrual migraine days). The secondary outcome measures are the change of migraine days outside the menstrual cycle, duration of migraine attack, the Visual Analogue Scale (VAS), and intake of acute medication. The assessment will be made at baseline (before treatment), 3 months (menstrual cycles), and 4 months (menstrual cycles) after the first acupuncture session.
The results of this trial will be helpful to supply the efficacy of acupuncture for menstrual-related migraine prophylaxis.
Migraine is a common neurological disorder. Population-based studies suggest that 6% to 7% of men and 15% to 18% of women experience migraine [1, 2]. More than 50% of female patients report that their migraines are associated with the menses . Attack onset is usually before the age of 20 years, with peak prevalence between the ages of 25 and 55 years, declining with menopause [4–6]. Increasing evidence links menstrual migraine to the female sex hormones [3, 7].
Approximately 14% of female migraineurs have migraine only during menstruation (pure menstrual migraine (PMM)) while 60% suffer from migraine at both menses and other times during the menstrual cycle (menstrual-related migraine (MRM)) . Most of the data in the literature report that MRM causes significant limitations of daily activities (for example, nausea, vomiting, and photo-phonophobia), and the attacks are generally longer, more severe, and less drug-responsive than non-menstrual ones [9, 10].
Given the particular clinical picture that characterizes MRM, it is not surprising that the attacks are difficult to treat. The options available for the treatment of MRM include acute therapy and prophylaxis (short-term preventive therapy and long-term preventive therapy) [11–14]. Acute therapy is initiated first. As MRM is unique in its predictability, treatment can be targeted to the period of time when patients are most likely to experience migraine. The treatment window for menstrual migraine occurs between 2 days before and 3 days after the onset of menses . The goals of prophylactic strategies are to reduce attack frequency, severity and duration, improve responsiveness of treatment for acute attacks, improve function, and reduce disability . Prophylactic medications include non-steroidal anti-inflammatory drugs (NSAIDs), triptans, estrogen, magnesium, dihydroergotamine (DHE), methysergide, and vitamin E . Caution should be taken when the drug is used within the same month for treating migraine attacks occurring during menses and outside the menstrual period due to the risk of medication-overuse headache, a risk which is, however, common to all medications used for menstrual-migraine prophylaxis or treatment .
Acupuncture, which is one of the main treatment modalities of Traditional Chinese Medicine (TCM), has been used for both the prevention and treatment of diseases for over 2,000 years. Several studies [15–18] have already reported the encouraging results in the therapy for migraine by acupuncture. A German randomized controlled trial (n = 794) showed that 11 acupuncture treatments given within 6 weeks were at least as effective as a β-blocker taken daily over 6 months . Yang et al. found that acupuncture treatment was more effective and safer than topirmarate . Wang and co-authors reported that acupuncture was more effective than flunarizine in decreasing the duration of migraine attacks . Therefore, acupuncture should be considered as an option for patients with migraine . Although the physiological mechanism is still unclear , in the last 40 years, many theoretically plausible models have been developed, such as the principle of counter-irritation diffuse noxious inhibitory control (DNIC) and the endorphin hypothesis Melzack’s gate control theory [20–22]. DNIC is regarded as a possible factor explaining central pain modulation through acupuncture [23, 24]. The endorphin hypothesis serves to explain a short-term analgesic effect of acupuncture, which is considered very robust.
However, based on a review of published literatures, the guidelines did not make treatment recommendation for acupuncture, because this therapy lacked adequate randomized controlled trials to support its effect .
When reviewing the evidence of acupuncture for MRM, only one published randomized controlled trial could be found . The objectives of that study were to introduce a new method for controlled trials of acupuncture for headache and to examine the role of needling per se. No significant differences were found between the verum group and the placebo group.
In this study, we will perform a randomized controlled trial to investigate the efficacy of acupuncture treatment as prophylaxis for MRM.
The trial protocol is in accordance with the principles of the Declaration of Helsinki and has been approved by the Research Ethical Committee of Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University on 10 May 2012 (ref: 201212). This trial was registered at Current Controlled Trials (ISRCTN57133712). Each participant will be notified regarding the study protocol. Written informed consent will be obtained from each participant.
A target sample of 184 participants will be recruited in acupuncture clinic from the following four hospitals: Beijing Traditional Chinese Medicine Hospital Affiliated to Capital Medical University, Peking University Third Hospital, Beijing Tiantan Hospital Affiliated to Capital Medical University, and Xiyuan Hospital affiliated with China Academy of the Chinese Medical Sciences. The trial will be exercised from December 2011 to December 2013.
According to the previous pilot study , the number of migraine days after treatment in acupuncture group is 3.1 ± 2.7 days, and the control group is 5.2 ± 4.4 days.
Based on 0.8 power to detect a significant difference (α = 0.01, two-sided), 73 participants will be required for each group, which is calculated by PASS 2008. Allowing for a 20% withdrawal rate, we will plan to enroll a total of 184 participants with 92 participants in each group.
Recruitment of participants
Two strategies will be used to recruit participants with MRM. One is to recruit participants in outpatient clinics from the four hospitals mentioned above. The other is to show recruitment posters outside the clinics. The posters will contain brief introductions about the population needed to be involved, the free acupuncture treatments offered to eligible participants, and the contact information of the researcher.
A baseline registration will be undertaken before treatment. At baseline, participants will be required to provide a review of migraine history covering at least the preceding 3 months (menstrual cycles), medical history in general, and the latest medication history.
Participants who meet all the following requirements will be allowed for enrollment:
Diagnosis of MRM : MRM without aura (code A1.1.2), in which migraine without aura always occurs on days 1 ± 2 of menstruation in at least two out of three menstrual cycles, and at other times due to different triggering factors or for no apparent specific reason (International Classification of Headache Disorders - second edition [ICHD-II])
Regular menstrual cycle
Predictable onset of inside-cycle migraine
Repeated migraine attacks, frequency of non-menstrual migraine is more than once a month
Written informed consent
Chronic migraine, tension-type headache, cluster headache, and other primary headaches
Secondary headache and other neurological diseases
Relatively severe systemic diseases (cardiovascular disease, acute infectious disease, hematopathy, endocrinopathy, allergy, and methysis)
Headache caused by otorhinolaryngology diseases or intracranial pathological changes
Oral contraceptives, pregnancy, or lactation period
Use of prophylactic migraine medication in the last 3 months
Participation in another clinical trial
Randomization and blinding
This is a multicenter (four hospitals in China), randomized controlled clinical trial. The central randomization will be performed by the Research Center of Clinical Epidemiology affiliated to Peking University in China, which use block randomization to generate the random allocation sequence and prepare predetermined computer-made randomization opaque sealed envelopes. The envelopes will be numbered consecutively and connected into a strain. Each envelope will be separated from the strain and then opened in sequence only after baseline period when the participants are registered in the trial.
In this study, the participants will be informed that they have a 50% chance of being allocated in either of the two groups: verum acupuncture plus placebo medication group and sham acupuncture plus true medication group. The placebo medication will be identical to true medication and sham acupuncture will produce same stimulation as verum acupuncture; hence participants will be blinded to the group allocation. A credibility of blinding test will be carried out in the middle of treatment phase and at the end of treatment phase. Furthermore, outcome assessors and personnel who will deal with data collection and data analysis will be blinded throughout the entire trial. The acupuncturist cannot be blinded due to the nature of the intervention, but they will be trained not to communicate with the participants or outcome assessors regarding treatment procedures and responses.
According to the predetermined randomization envelopes, participants will be randomly allocated to acupuncture group or control group (see Additional file 1: Figure S1). Participants will be asked to record headaches and usage of acute medication in a headache diary from the baseline period to the fourth month (menstrual cycle) after randomization. The headache diary will be collected separately from four hospitals in the fourth month (menstrual cycle) after randomization by blinded telephone interviewers (see Additional file 2: Table S1).
Interventions are selected according to records in ancient and modern books and results of previous research about treating migraine with acupuncture [17, 27]. All participants will go through a standardized interview and receive more information about the study. Acupuncturists for both groups have >20 years of clinical experience and an acupuncture license from the Chinese medicine practitioner license from the Ministry of Health of the People’s Republic of China. Before performing this trial, all acupuncturists will receive special training about the purpose and content of the trial, treatment strategies, and quality control. The treatments are fully documented in accordance with the STRICTA  and good clinical practice guidelines (GCP).
All participants will receive treatment for 3 months (menstrual cycles). In the treatment group, participants will receive two acupuncture sessions per week (including during menstruation) for preventive treatment on migraine, and at least three additional acupuncture sessions for premenstrual conditioning during 10 days before menstruation, while placebo medicine will be given. In the control group, participants will be given medicine (Naproxen Sustained Release Tablets) and two sham acupuncture sessions per week.
Each session will last for 30 min. The number of needles will be from 10 to 12 in each session for both groups. Sterile needles for single use (Hwato Needles, made in Suzhou, China) are used in this trial. 30-gauge (0.3 mm in diameter), 40 mm-long needles are used for limb and abdomen points and 32-gauge (0.25 mm in diameter), 25 mm-long needles for head points. All needles will be inserted 10 to 15 mm in depth and manually manipulated by rotation methods to produce a characteristic sensation known as De Qi (feeling of needle sensation refers to tenseness around the needle felt by the practitioner and numbness, distension, soreness, and heaviness around the point felt by the patient).
The placebo medicine will have exactly the same appearance as true medicines (Naproxen Sustained Release Tablets). Both Naproxen Sustained Release Tablets and placebo will be taken 0.5 g once per day, from the third day (± 1 day accepted) before menstruation comes to an end. All participants will be permitted to treat acute headaches as required, but the type and dosage of used medications should be recorded in the headache diary.
The points used in the treatment group
1.1 Preventive Treatment on Migraine by Acupuncture
Main points: DU20 (Baihui), DU24 (Shenting), GB13 (Benshen), GB8 (Shuaigu), SJ20 (Jiaosun), and GB20 (Fengchi)
Additional points can be chosen according to syndrome differentiation of meridians: Shaoyang headache (TE-GB): SJ5 (Waiguan), GB34 (Yanglingquan); Yangming headache (LI-ST): LI4 (Hegu), ST44 (Neiting); Taiyang headache (SI-BL): BL60 (Kunlun), SI3 (Houxi); Jueyin headache (PC-LR): LR3 (Taichong), GB40 (Qiuxu); Nausea and vomiting: PC6 (Neiguan); Dysphoria and susceptibility to rage: LR3 (Taichong)
1.2 Premenstrual Conditioning by Acupuncture
Points: KI12 (Dahe), RN3 (Zhongji), ST29 (Guilai)
The points used in the control group
To make the quantity of stimulus uniform between two groups, the decision is made to use the same kind, size, and number of needles for control group as for treatment group. The procedure for developing the sham acupuncture protocol contains three steps.
Literature search: Based on the search and analyses of 26 ancient Chinese books of acupuncture, three Chinese acupuncture textbooks and >100 acupuncture research literatures, the points with no reference to therapeutic effects on headache or menstruation have been enumerated.
Point selection: To avoid effects on headache and effects of alleviating pain, the points in the head, trunk, hands, and feet are excluded. And then 15 points (see Additional file 3: Table S2) without effects on headache or menstruation are extracted and these points are defined as sham points, which will be used in the control group.
Sham points subgroup: 15 sham points will be randomly assigned to three subgroups of control groups which are labeled from B to D and will be recorded in the predetermined computer-made randomization sealed envelope. Each subgroup has two points on arms and three points on legs (see Additional file 4: Table S3). A participant who belongs to the control group will be assigned to one of subgroups and the five points in this subgroup will be used on this participant in the whole treatment period.
The efficacy of acupuncture for migraine prophylaxis will be assessed by the following primary outcome measures:
The change of migraine days inside the menstrual cycle 
The proportion of responders (defined as the proportion of patients with at least a 50% reduction of the number of menstrual migraine days) 
The secondary outcome measures include:
The change of migraine days outside the menstrual cycle 
Duration of migraine attack 
Visual analogue scale (VAS) for pain, ranging from 0 (no pain) to 10 (worst pain ever) 
Intake of acute medication 
The outcome measures above will be assessed at baseline (before treatment), 3 months (menstrual cycles) after the first acupuncture session, and four months (menstrual cycles) after the first acupuncture session.
The participants will be asked to fill in headache diaries from baseline period to the fourth month (menstrual cycle) after randomization. In the diaries, the participants will record on diary cards details of their migraine attacks, including the time of headache attack and cease, intensity, frequency, location, and cause of the headache and its associated symptoms in each migraine attack. The participants will document whether or not they take the acute medicine. The name, dosage of the medicine, time of taking medicine, time of pain relief, and side effects of the medicine will also be recorded by the participants if they take the medicine. The participants will also complete calendar cards to indicate the days on which the menstruation occurs and which they receive acupuncture treatment.
The participants will report the adverse events they experience, including discomfort or bruising at the sites of needle insertion, nausea, or feeling faint after each treatment.
The reason for drop-out or withdrawal, as well as the participant’s compliance, will be documented in CRF during the 3 months of treatment and 1 month of follow-up.
The analyses will be performed on an intention-to-treat basis, with missing data replaced by last measure values. The P value for statistical significance is defined as P <0.05 in all comparisons, and all statistical testing is two-sided. Analysis of variance (ANOVA) for repeated measures is used to compare the two groups. Comparisons within groups for the outcomes in each one of the time point are done using the Tukey’s post hoc test of Multivariate Analysis of Variance (MANOVA). As for proportions, a chi-square test is applied. Stratified analysis within four different centers will be performed to control confounding factor if necessary.
Data analysis will be conducted by statisticians who are independent from the research team. Every analysis is conducted by using the SPSS software version 13.0 (SPSS, Chicago, IL, USA).
We have presented the design and the protocol for a randomized controlled trial of acupuncture compared with naproxen in the prophylactic therapy for patients with MRM. Completion of this trial will help to supply the evidence on the efficacy of acupuncture for MRM prophylaxis.
During the preparation period of this trial, we spent plenty of time designing the control group, since appropriate control is crucial for a high-quality randomized controlled trial. One major issue is whether sham acupuncture should be used. As the primary consideration of this trial is to clarify whether acupuncture is effective for MRM prophylaxis, we all agree that a pragmatic design is more suitable, which requires standard care rather than placebo controlled trials . However, in China, because of the common concept of drug dependence, a large proportion of patients are unwilling to use medication, despite a confirmed diagnosis of migraine. Acupuncture has been commonly used in clinical practice in China. Patients usually expect to receive acupuncture treatment when they participate in the trial. To improve compliance of participants, sham acupuncture will be adopted in the control group while placebo medicine will be used in acupuncture group.
Naproxen is a drug classified as NSAIDs, which is considered safe and effective for the prophylactic treatment of menstrual migraine [32–34]. Therefore, we compare the efficacy of acupuncture with naproxen, which is chosen as a standard drug therapy.
Clinical acupuncture research is complicated for several reasons, of which the placebo issue is the most intriguing one [35, 36]. Therefore, the American Headache Society (AHS) has stressed the need for developing new methods for controlled studies of acupuncture in treating headache .
The choice of sham points developed in our trial is based on international considerations about the methodological problems of sham acupuncture . To avoid any influence on MRM, we searched points without effect on headache or menstruation from both ancient and modern literatures. This method of selecting sham points can be seen in Alecrim , nevertheless, our searching scope is more extensive. We have searched many Chinese articles, particularly ancient books, which have not yet been translated into English. Last but not least, there are 15 points without effects on headache or menstruation extracted, but only five points will be applied to each patient in control group. Points, chosen and made up as a control subgroup, are determined by computer-made randomization. This process of confirming sham points could further eliminate potential effects on MRM.
However, this study has several methodological limitations. Previous randomized controlled trials suggest that there is no obvious difference between verum and sham acupuncture groups, even though they are effective compared with no treatment [40, 41]. Repetitive relaxation and being cared for may be the reasons. In the present study, these factors have been standardized as strictly as possible and the selection of sham points is different from previously published trials. We still cannot rule out the physiological effects of our control intervention design. Another limitation is that the therapist is not blinded in this trial. It is almost impossible to have genuine double blinding in acupuncture trials, because acupuncturists have to control participant’s perception of needling. This study does not allow us to determine whether the observed effectiveness is caused by placebo effects, intensity of provider contact, or a physiologic effect of needling. Therefore, a bias due to unblinding cannot be ruled out. In addition, the sample size in the present study is relatively small.
The trial is currently in the recruitment phase.
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The trial is sponsored by the Beijing Administration of Traditional Chinese Medicine and the source of funding is the Beijing Foundation for Science and Technology of Traditional Chinese Medicine ref: JJ2011-03 (China).
The authors declare that they have no competing interests.
XZZ conceived this study and prepared the initial protocol. LZ drafted the manuscript and participated in design of the study. JG and LZ participated in rewriting the manuscript. YY, GXS, and TZ participated in the development of the acupuncture point protocol. HLL and LPW made amendments and participated in design of the trial protocol. All authors read and approved the final manuscript.
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Zhang, X., Zhang, L., Guo, J. et al. Acupuncture as prophylaxis for menstrual-related migraine: study protocol for a multicenter randomized controlled trial. Trials 14, 374 (2013). https://doi.org/10.1186/1745-6215-14-374
- Menstrual Cycle
- Migraine Attack
- Acupuncture Treatment
- Acupuncture Group