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Herbal medicine Shaofu Zhuyu decoction for primary dysmenorrhea: a systematic review protocol

Hoyoung Lee

Abstract

Background: Dysmenorrhea is a common gynecological complaint in adolescent and young females. The purpose of this study is to assess the efficacy of Shaofu Zhuyu (SFZY) decoctions as treatments for primary dysmenorrhea.

Methods/design: Fifteen (four English, seven Korean, three Chinese, and one Japanese) databases will be searched from their inception without a language restriction. These include PubMed, AMED, EMBASE, The Cochrane Library, seven Korean Medical Databases (Korean Studies Information, DBPIA, Oriental Medicine Advanced Searching Integrated System, Research Information Service System, KoreaMed, The Town Society of Science Technology, and the Korean National Assembly Library), three Chinese Medical Databases [the Chinese Medical Database (CNKI), Chongqing VIP Chinese Science and Technology Periodical Database (VIP), and WanFang Database], and one Japanese Database (J global). Randomized clinical trials (RCTs) included those that examined an SFZY decoction or a modified SFZY decoction. The control groups include no treatment, placebo, and medication. Trials testing a combination of SFZY decoction and medication compare to the same medication alone will be also included. Data extraction and risk of bias assessments will be performed by two independent reviewers. All statistical analyses will be conducted using Review Manager software (RevMan V.5.3.0). Methodological quality will be assessed with the Cochrane risk of bias tool.

Discussion: This systematic review will provide a detailed summary of the available evidence testing the effects of SFZY decoctions for the treatment of primary dysmenorrhea. The review will benefit patients and practitioners in the fields of traditional and complementary medicine.

Systematic review registration: PROSPERO registration number: CRD42015016386

Keyword: Herbal medicine, Shaofu Zhuyu decoction, Dysmenorrhea, Randomized controlled trials (RCTs), Systematic review

Background

Description of the condition

Dysmenorrhea is a common gynecological complaint in adolescent and young females. Dysmenorrhea is charac-terized by lower abdominal pain that occurs during menstruation [1]. Different types of studies have found a consistently high prevalence of dysmenorrhea in women of different ages and nationalities with an estimated

Full list of author information is available at the end of the articleprevalence ranging from 45 to 97 % [2]. Ten percent of these women suffer from symptoms severe enough to ren-der them incapacitated for 1 to 3 days each menstrual cycle [3]. Period pain can lead to absences from school or work [4]. In the USA alone, it was estimated that in the mid-1980s, 600 million hours were lost from work, which led to an economic loss of two billion dollars; in today’s dollars, this figure would be much higher [5].

How the intervention might work

The mechanisms of primary dysmenorrhea have been at- tributed to high serum levels of prostaglandin E2 (PGE2), prostaglandin F2-α (PGF2-α), and leukotriene [6]. Severe myometrial contractions, vasoconstriction, uterine ische-mia, and subsequent dysmenorrheic pain result from the release of these cytokines. Moreover, withdrawal of pro-gesterone before the beginning of the menstrual cycle initiates arachidonic acid release and further elevates cyto-kine levels due to the degradation of arachidonic acid. Higher cytokine levels contribute to a higher intensity of dysmenorrheic pain and associated symptoms [7]. Non-steroid anti-inflammatory drugs (NSAIDs), therefore, are the primary treatment for this condition but are limited by inadequate pain control, gastrointestinal discomfort, and an impact on renal function. Combined oral con-traceptives are also frequently used but are not universally accepted possibly due to their potential side effects includ-ing inducing endometriosis [8]. Therefore, complementary and alternative medicine (CAM) is in high demand in many countries [9]. In one large study, as many as 48 % of women reported the use of CAM as an alternative to pre-scription medication or to enhance the effectiveness of their prescription medications [10, 11]. Recenlty, it was reported that Shaofu Zhuyu (SFZY) decoction have the efficacy of uterine smooth muscle constriction and mani-fested an anti- inflammatory efficacy [12]. Also, SFZY decoction improved hemorheological factor of blood stasis and regulation for activity on rat ovary [13].

Description of the intervention

Herbal medicine is currently used in hospitals and clinics in Korea [14], China [2], Taiwan [15], and Japan [16] for the treatment of primary dysmenorrhea. SFZY decoction was first described in the Yi Lin Gai Cuo, which is a fam-ous formula that has been used for treating primary dys-menorrhea in China since the Qing dynasty. This decoction is used, particularly in gynecology, for blood stasis accompanied by masses and gatherings in the lower abdomen [17]. Clinically, it has been used for the treat-ment of chronic pelvic inflammatory disease, infertility, endometrial hyperplasia, myoma uteri, and uterine cancer

[18]. Many reports have described its efficacy for treating vascular disorders and pain [19], endometriosis [20], cancer [21], and menstrual irregularities in vivo [22]. SFZY decoction composed of ten herbs by Quin-ren Wang in Qing dynasty: Fructus Foeniculi, Zingiberis Rhizoma, Cinnamomi Cortex, Paeoniae Rubra Radix, Angelica Sinensis Radix, Carthami Flos, Myrrha, Corydalis Rhizoma, Typhae Pollen, and Trogopterori Faeces, in the ratio of 0.5:1:1:1:3:1:1:1:3:2 on a dry weight basis [12]. The detail of composition is shown Table 1. The composition of China came from Qing dynasty and decoction of Korean came from DongUiBoGam. SFZY decoctions have shown an effect on uterine muscles and may help to prevent and cure dysmenorrhea. SFZY decoctions are considered   an  ef-fective  prescription  for  treating  primary dysmenorrhea

Why is performing this review important

Recently, many studies have reported treatments using herbal formulas. The Cochrane Review on Chinese herbal medicine showed promising evidence for the use of Traditional Chinese Medicine (TCM) in reducing menstrual pain in primary dysmenorrhea. Unfortunately, many of the studies supporting the use of Chinese herbs were of poor quality [25, 26].

Currently, no relevant systematic reviews of the efficacy of SFZY decoctions for treating primary dysmenorrhea are conducted.

Objectives

The aim of this study is to systematically review the avail-able literature regarding the efficacy of SFZY decoctions in treating primary dysmenorrhea.

Methods/design

This study has been registered with international Pro-spective Register of Systematic Reviews (PROSPERO): CRD42015016386.

Criteria for including studies in this review Type of studies

Only randomized controlled trials (RCTs) and quasi-RCTs will be included.

Type of participants

This study will include women of reproductive age with pri- mary dysmenorrhea, i.e., individuals with no identifiable pelvic pathology as indicated by a pelvic examination, ultra- sound scans and laparoscopy, or women self-reporting a diagnosis of primary dysmenorrhea.

Types of interventions

Studies that used an SFZY decoction or a modified SFZY decoction will be included. SFZY decoctions will include the following ten formulas: Fructus Foeniculi, Zingiberis Rhizoma, Cinnamomi Cortex, Paeoniae Rubra Radix, Angelica Sinensis Radix, Carthami Flos, Myrrha, Corydalis Rhizoma, Typhae Pollen, and Trogopterori Faeces [17]. Modified SFZY decoction formulas will be included as well. Modified SFZY decoctions prescribe according to TCM syndrome differentiation will be ac-ceptable and be defined by practitioners as adding only herbs to the original herbs, resulting in nearly the same actions as the original SFZY decoction. All types of herbal medicines will be included.

There is no limitation on the number of herbs, administration methods dosage, or duration of treatment.

Types of comparisons

The control groups will consist of no treatment, placebo, and medication. Trials examining a combination of SFZY decoctions and medication will compare to the same medication alone will be also included.

Outcome measures Primary outcomes

Pain: a reduction in pain (i.e., menstrual pain) that occurs only during the intervention or occurred as a result of the intervention, measure by a visual analogue scale (VAS), other validated scales, or as a dichotomous outcome. Response rate: an overall reduction in symptoms (other menstruation-related symptoms) that occurs only during the intervention or occurred as a result of the intervention, measure by changes in dysmenorrhea symptoms and treatment effectiveness, and is either self-reported, observed, or reported by other similar measures.

Secondary outcomes

Adverse effects: measured by any relevant incidence and duration of any side effects. Quality of life: measured by a validated scale.

Search methods for identifying the studies Electronic searches The following databases will be searched from their incep-tion:

PubMed, AMED, EMBASE, The Cochrane Library

seven   Korean   Medical   Databases   (Korean   Studies   Infor- mation, DBPIA, Oriental Medicine Advanced Searching Integrated System, Research Information Service System, KoreaMed, The Town Society of Science Technology, and the Korean National Assembly Library), three Chinese Medical Databases [the Chinese Medical Database (CNKI), Chongqing VIP Chinese Science and Technology Periodical Database (VIP), and WanFang Database], and one Japanese Database (J global).

Studies will also be obtained from the following sources: The reference lists of all relevant articles

– Hand searching of department files

– Unpublished conference proceedings relevant to primary dysmenorrhoea will be reviewed, if available

Search strategy

The strategy for searching the databases is presented in Tables

2 and 3. Similar search strategies will be applied for all databases. In addition, the reference lists of all re-trieved articles will be hand-searched for further relevant literature. Hard copies of all included articles will be read in full. Because all of the various databases use for this study possessed their own subject headings, each database will be searched independently.

Data collection and analysis Selection of studies

Two reviewers (HYL and TYC) will review and screen the titles and abstracts to identify eligible trials ac-cording to the inclusion criteria. Disagreements will be resolved by discussion, if necessary, by the arbiter (MSL). Details of the study selection procedure are shown in Fig. 1.

Data extraction

All articles will be performed by two authors (HYL and TYC) who extract data according to pre-defined criteria. Information such as the participants, interventions, out-comes, and results will be obtained from each report. Any disagreement between the two authors will be resolved by discussion. Another author (MSL) will act as an arbiter for unresolved disagreements.

Assessment of bias in the included studies

Two authors (HYL and TYC) will assess the risk of bias using the following seven criteria from the Cochrane clas-sification:

(1) random sequence generation, (2) allocation  concealment,

blinding of participants and personnel, blinding of outcome assessment, (5) incomplete out- come data, (6) selective outcome reporting, and (7) other sources of bias (we evaluate baseline imbalance) [27]. This

Assessment of heterogeneity

We will use the random effects or fixed effects model for the meta-analysis according to the data analysis. If a meta-analysis is possible, we will use the I2 statistic to quantify the inconsistencies among the included stud-ies. According to the guidance given in the Cochrane Handbook for Systematic Reviews of Interventions, as a general rule, I2 values of up to 25 % provide evidence of low heterogeneity; a value of 50 % is considered moder-ate heterogeneity and 75 % or above is considered as a high heterogeneity. In the presence of significant het-erogeneity, the causes of heterogeneity will be exam-ined by pre-specified subgroup analysis and also sensitivity analysis, if possible. Where subgroup analysis fails to explain the heterogeneity, then data will be analyzed using the random  effects  model.  If  heterogen-eity  is  observed,  we  will conduct a subgroup analysis to explore the possible causes Assessment of reporting biases  If a sufficient number of included studies (at least ten trials) are available, we will use funnel plots to detect reporting biases. However, funnel plot asymmetry is not the same as publication bias; therefore, we will attempt to distinguish the possible reasons for the asymmetry, such as small-study effects, poor methodological quality, and true heterogeneity in the included [29, 30].

Subgroup analysis and investigation of heterogeneity

If there are an adequate number of studies, we will con-duct subgroup analyses to interpret the heterogeneity between the studies, including the following

Type of design: SFZY decoction treatment used alone or as combination therapy with SFZY decoction and conventional therapy Type of intervention: type of herbal medicines (SFZY decoction or modified SFZY decoction)

Sensitivity analysis

We will conduct sensitivity analysis to test the robustness of the  primary  decisions  of  the  review &nbs