Use of electroacupuncture and transcutaneous electrical acupoint stimulation in reproductive medicine: a group consensus

Use of electroacupuncture and transcutaneous electrical acupoint stimulation in reproductive medicine: a group consensus 电针和经皮穴位电刺激技术在生殖医学中的应用：专家共识 1 first-author 2 3 4 5 6 7 5 2 4 8 9 9 10 10 1 11 1 5 12 5 corresp ‡Corresponding Author ‡Corresponding Author †E-mail:hanjisheng@bjmu.edu.cn †E-mail:hanjisheng@bjmu.edu.cn hanjisheng@bjmu.edu.cn Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou 310006, China Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou 310006, China Center of Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital /Key Laboratory of Assisted Reproduction, Ministry of Education / Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China Center of Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital /Key Laboratory of Assisted Reproduction, Ministry of Education / Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China Center of Reproductive Medicine, the Second Hospital Affiliated to Shandong University of Traditional Chinese Medicine, Jinan 250001, China Center of Reproductive Medicine, the Second Hospital Affiliated to Shandong University of Traditional Chinese Medicine, Jinan 250001, China Center of Reproductive Medicine, CITIC Xiangya Reproductive and Genetic Hospital, Changsha 410008, China Center of Reproductive Medicine, CITIC Xiangya Reproductive and Genetic Hospital, Changsha 410008, China Neuroscience Research Institute, Peking University /Department of Neurobiology, School of Basic Medical Sciences /Peking University Health Science Center / Key Lab for Neuroscience, Ministry of Education/Ministry of Health, Beijing 100083, China Neuroscience Research Institute, Peking University /Department of Neurobiology, School of Basic Medical Sciences /Peking University Health Science Center / Key Lab for Neuroscience, Ministry of Education/Ministry of Health, Beijing 100083, China Center of Reproductive Medicine, Renmin Hospital of Wuhan University, Wuhan 430060, China Center of Reproductive Medicine, Renmin Hospital of Wuhan University, Wuhan 430060, China Center of Reproductive Medicine, Peking University People’s Hospital, Beijing 100044, China Center of Reproductive Medicine, Peking University People’s Hospital, Beijing 100044, China Center of Reproductive Medicine, the Sixth Affiliated Hospital of Zhongshan University, Guangzhou 510655, China Center of Reproductive Medicine, the Sixth Affiliated Hospital of Zhongshan University, Guangzhou 510655, China Center of Reproductive Medicine, Jiangsu Province Hospital, Nanjing 210029, China Center of Reproductive Medicine, Jiangsu Province Hospital, Nanjing 210029, China Center of Reproductive Medicine, Beijing Obstetrics and Gynecology Hospital, Beijing 100026, China Center of Reproductive Medicine, Beijing Obstetrics and Gynecology Hospital, Beijing 100026, China Zhejiang Chinese Medical University, Hangzhou 310053, China Zhejiang Chinese Medical University, Hangzhou 310053, China Wuxi HANS Therapy Medical Technology Co., Ltd., Wuxi 214092, China Wuxi HANS Therapy Medical Technology Co., Ltd., Wuxi 214092, China With the rapid development of assisted reproductive technology, various reproductive disorders have been effectively addressed. Acupuncture-like therapies, including electroacupuncture (EA) and transcutaneous electrical acupoint stimulation (TEAS), become more popular world-wide. Increasing evidence has demonstrated that EA and TEAS are effective in treating gynecological disorders, especially infertility. This present paper describes how to select acupoints for the treatment of infertility from the view of theories of traditional Chinese medicine and how to determine critical parameters of electric pulses of EA/TEAS based on results from animal and clinical studies. It summarizes the principles of clinical application of EA/TEAS in treating various kinds of reproductive disorders, such as polycystic ovary syndrome (PCOS), pain induced by oocyte retrieval, diminished ovarian reserve, embryo transfer, and oligospermia/asthenospermia. The possible underlying mechanisms mediating the therapeutic effects of EA/TEAS in reproductive medicine are also examined. 本文从传统针刺治疗不孕症的选穴依据与现代电针/经皮穴位电刺激技术的相关原理着手，从最优刺激参数选择、穴位辨证、疗程与治疗次数的确定及基本原理等方面阐述了电针/经皮穴位电刺激技术在多囊卵巢综合症、取卵镇痛、卵巢储备功能降低、胚胎移植以及男性少/弱精症等生殖领域中的具体应用。首次对电针/经皮穴位电刺激技术在生殖领域优势病种中的应用进行了系统的分析和总结，在最优刺激参数选择、穴位辨证、疗程与治疗次数的确定等方面提出了一系列专家共识，并为临床实践提供了指导意见和理论依据。 Electroacupuncture (EA) Transcutaneous electrical acupoint stimulation (TEAS) Reproductive medicine Group consensus 电针 经皮穴位电刺激 生殖医学 专家共识 Introduction 1 Infertility, as a key reproductive disorder, is listed by the World Health Organization (WHO) as one of the top three diseases, affecting 10%–15% married couples worldwide (Boivin et al., 2007 2007 ). Although some reproductive disorders have been effectively addressed with the development of assisted reproductive technology (ART) (Bjelica and Nikolic, 2015 2015 ), the pregnancy rate is still unsatisfactory. Acupuncture has been used in treating gynecological and reproductive disorders for thousands of years (Zhou and Qu, 2009 2009 ). Electroacupuncture (EA) and transcutaneous electrical acupoint stimulation (TEAS), the modern therapies derived from traditional acupuncture, have received increasing attention in recent years (Han and Ho, 2011 2011 ; Johansson et al., 2013 2013 ). The present group consensus is intended to provide guidelines for physicians and practitioners using EA or TEAS in the treatment of reproductive disorders (Li et al., 2016 2016 ). Twenty experts were involved in this study for the group consensus with Delphi methods, which took nine weeks to reach consensus. EA adds an electrical stimulation pulse to traditional acupuncture needles. The sensory input can be enhanced through the pulsatile current applied to the acupoints. TEAS uses self-adhesive electrodes placed on the surface of acupoints, instead of needles for electrical stimulation. Acupuncture, EA, and TEAS can activate nerve endings or fibers and generate action potentials (Han, 2003 2003 ; Kagitani et al., 2005 2005 ; Michikami et al., 2006 2006 ; Zhao, 2008 2008 ). The resulting stimulation signals, which are transmitted to the spinal cord and brain, stimulate the central nervous system to generate specific chemical mediators to induce relevant physiological effects. Acupuncture, EA, and TEAS are all attributed to the “peripheral neuromodulation” approach (Han and Terenius, 1982 1982 ; Wang et al., 2008 2008 ; Zhao, 2008 2008 ), by which nerve endings can be activated and action potentials can be generated. The underlying mechanisms of EA or TEAS are not completely understood. It is likely that a wide variety of biological actions of EA and TEAS are mediated by multiple and different mechanisms (Zhao, 2008 2008 ). The EA-induced analgesia has been studied extensively in the last decades and served as an example how this ancient technique can be interpreted and employed by modern biomedical science. It is generally accepted that the activation of sensory nerve terminals by either mechanical and/or electrical stimulation is transmitted to various critical pain regulatory centers in the spinal cord and brain to generate specific chemical mediators including endorphins. The descending pain modulator pathways are then activated, to induce an analgesic effect. While there are many data collected from research in acupuncture analgesia, increasing attention has also been paid to other areas such as its application in ART (Cui et al., 2011 2011 ; Rashidi et al., 2013 2013 ). This article is intended to summarize the existing data and develop a consensus in application of TEAS in ART. The pulsatile current can be characterized by at least three important parameters: frequency, pulse width, and intensity (Han, 2003 2003 ). Effective frequency ranges from 2 to 100 Hz for EA and TEAS. It has been reported that stimulation with different frequencies may sometimes generate totally different biological effects. For example, low-frequency (2 Hz) electrical stimulation promotes the production and release of encephalin in the central nervous system, while high-frequency (100 Hz) electrical stimulation promotes the production and release of dynorphins in the spinal cord (Han et al., 1991 1991 ). The pulse width, which should range from 0.2 to 0.6 ms, significantly affects the feelings generated by the EA stimulation (Chen and Han, 1992 1992 ; Han, 2011 2011 ). The intensity of the current ranges from 0.5 to 5.0 mA for EA, and 5 to 30 mA for TEAS (5–10 mA for upper limbs, 10–30 mA for lower limbs and trunk). For the duration of each treatment, a 30-min program is commonly used in most treatment regimen according to the clinical experience and the relevant scientific evidence (Research Group of Acupuncture Anesthesia, Peking Medical College, 1973 1973 ; Wang et al., 1992 1992 ; Cheing et al., 2003 2003 ). The interval between two treatments is also a matter of consideration. Acute pain may need just one or two sessions of treatment (Liu et al., 2007 2007 ), while chronic disorders of the endocrine system may need more sessions, for example, 1–3 times per week for several weeks or even months (Zhan and Wang, 2008 2008 ), depending on the severity of the symptoms. It should be noted that although the selection of acupoints is mainly determined by the meridian and collateral theory in traditional Chinese medicine (TCM), the outcome measures as well as the parameter design of EA and TEAS are based on modern biomedical research. Principles of selecting acupoints 1 The “kidney-Tian Gui-Chong Ren-uterus” theory of TCM resembles the “hypothalamic-pituitary axis” theory in modern medicine. The selection of acupoints is based on the mechanisms of infertility as follows. Ovarian hypofunction 2 The deficiency of kidney, disharmony of Chong and Ren, disorder of Qi and blood are the basic pathological situation. Thus invigorating the kidney, promoting Qi and blood, and regulating Chong and Ren are the principles for selecting acupoints. 1. Acupoints for invigorating the spleen and stomach, tonifying Qi and activating blood: Guanyuan (CV 4), Tianshu (ST 5), and Zhongji (CV 3). 2. Acupoints for nourishing the heart and activating blood, soothing the liver and regulating Qi: Zigong (EX-CA1) and Sanyinjiao (SP 6). 3. Acupoints for warming or nourishing the kidney to strengthen kidney essence: Mingmen (GV 4), Shenshu (BL 23), and Yaoyangguan (GV 3). Promoting embryo implantation 2 Acupoint selection is according to the principle of invigorating the kidney and nourishing blood. 1. Acupoints for activating blood and smoothing the collaterals prior to embryo transfer (ET): Guilai (ST 29), Zigong (EX-CA1), Xuehai (SP 10), and Diji (SP 8). 2. Acupoints for invigorating the spleen and kidney, tonifying Qi and soothing mind after ET: Zhongwan (CV 12), Guanyuan (CV 4), Zusanli (ST 36), Taixi (KI 4), and Shenshu (BL 23). Ovulation induction 2 Based on the principle of “to treat deficiency with tonification, fullness with relief, and prolonged stagnation with elimination”, acupoint selection should be in accordance with the effect of invigorating the kidney, soothing the liver, invigorating blood, and regulating Chong and Ren: Tianshu (ST 25), Guanyuan (CV 4), Zhongji (CV 3), Zigong (EX-CA1), and Sanyinjiao (SP 6). Asthenospermia and oligospermia 2 TCM believes that asthenospermia and oligospermia are caused by kidney deficiency, spleen and stomach weakness. Based on the theory of “to treat deficiency with tonification”, acupoint selection depends on the effect of invigorating the kidney: Shenshu (BL 23), Guanyuan (CV 4), Huiyin (CV 1), and Zusanli (ST 36). Mechanism mediating the effects of acupuncture, EA, and TEAS 1 In terms of modern medicine, the therapeutic benefits of acupuncture on a variety of clinical diseases seem to be mainly attributed to the regulation of the neuroendocrine system and the blood flow to reproductive organs. For example, in the condition of low sex hormone like ovarian dysfunction or menopausal syndrome, acupuncture can activate aromatase, promote the generation of neuropeptide Y (NPY), and improve the local blood flow of the ovary, enhancing the utilization efficiency of estrogens, and the apparent improvement of the reproductive systems is manifested as inhibition of the elevations of follicle stimulating hormone (FSH) and luteinizing hormone (LH) (Stener-Victorin et al., 2003 2003 ; Zhao et al., 2005 2005 ). The effect of acupuncture on polycystic ovary syndrome (PCOS), a state of high sex hormone function, is likely to be achieved by promoting the release of β-endorphin and inhibiting the generation of gonadotropin-releasing hormone (GnRH) in the hypothalamus (Stener-Victorin and Lindholm, 2004 2004 ), thereby reducing the blood level of FSH and LH (Wildt et al., 1993 1993 ). Acupuncture also plays a role in increasing the release of β-endorphin, endomorphins, enkephalins, serotonin, and other neurochemical substances to relieve pain and mental stress and reduce anxiety and/or depression of patients (Han and Terenius, 1982 1982 ; Han et al., 1991 1991 ; Han, 2003 2003 ). Therefore, acupuncture can improve the function of the reproductive system and induce a positive feedback effect on the hypothalamic-pituitary-gonad (HPG) axis due to the effect on central and peripheral neurobiological key points. The selection of the electrical stimulation time, location, and stimulation parameters (frequency and intensity) varies for different diseases. Outcome measures in clinical trials for EA and TEAS 1 Many different aspects could be taken into consideration in evaluation of the ovarian function. The changes in serum hormone levels are widely used to assess the ovarian reserve function. The most frequently used biomarkers include FSH, LH, basal FSH/LH, estradiol (E 2 ), inhibin B, anti-mullerian hormone (AMH). The ovarian size and antral follicle count (AFC) also provide valuable information (Erdem et al., 2003 2003 ; Mutlu and Erdem, 2012 2012 ). Many values and indexes help to estimate the perfusion of the ovary, including peak systolic velocity (PSV), end diastolic velocity (EDV), PSV/EDV of ovarian interstitial blood flow, resistance index (RI), pulsatility index (PI), vascular index (VI), blood flow index (FI), and vascular blood flow index (VFI) of ovarian stromal blood flow (Schild et al., 2000 2000 ; Polisca et al., 2013 2013 ; Hançerlioğullarıa et al., 2015 2015 ). The perfusion state of the ovary correlated closely to the ovarian reserve function. In addition, dynamic tests including the clomiphene stimulation test and the GnRH stimulation test are also commonly used to reflect ovarian functions (Griesinger et al., 2016 2016 ). Proper perfusion of the endometrial membrane has been considered as an important permitting factor allowing embryo implantation to occur. Various methods have been developed to determine uterine blood flows and various formulae have been used to calculate the resistance of the blood vessels. Endometrial receptivity is usually evaluated by thickness and type of endometrium and PSV, EDV, PSV/EDV and RI of the endometrial spiral artery under transvaginal ultrasound assessment (Zhang et al., 2016 2016 ). The expressions of pinopodes, estrogen receptor, progesterone receptor, cytokines related to embryo implantation integrin family, such as homebox A10 (HOXA10), heparin binding epidermal growth factor, and leukemia inhibitory factor, are also useful markers (Achache and Revel, 2006 2006 ). Sperm quality is commonly evaluated by a semen routine (sperm quantity, motility, and morphology), seminal plasma biochemistry (seminal plasma fructose and α-glucosidase), and DNA fragmentation (Esteves and Chan, 2015 2015 ). ART outcomes include ovulation rate (OR), metaphase II oocytes rate, fertilization rate, good-quality embryo rate, implantation rate, biochemical pregnancy rate, clinical pregnancy rate, miscarriage rate, and live birth rate (Neyens et al., 2016 2016 ). Application of EA/TEAS in treating PCOS 1 Based on the basic theory of TCM, acupoints mostly belong to the meridians of Du and Ren, and stomach and spleen in the treatment of PCOS. The vital acupoints include Guanyuan (CV 4), Zhongwan (CV 12), Tianshu (ST 25), Zusanli (ST 36), and Sanyinjiao (SP 6). In addition, acupoints in other meridians, such as Zigong (EX-CA1) and Taichong (LR 3), are also commonly used in clinical practice (Cui et al., 2011 2011 ; Johansson et al., 2013 2013 ; Lei and Feng, 2014 2014 ). In the treatment of PCOS, the EA/TEAS with low frequency (2 and 20 Hz) is more prevalent; the range for intensity is determined by patient tolerance; and the course of treatment ranges from 1 to 6 months according to the patient’s condition (Jedel et al., 2011 2011 ). Too many therapeutic indexes, as menstrual cycles, body mass index (BMI), LH/FSH, OR, and pregnancy rate, are used to evaluate the curative effect of acupuncture on PCOS, which may lead to confused therapeutic assessments (Wu et al., 2016 2016 ). Application of EA/TEAS during oocyte retrieval for analgesia 1 Up to now, the biggest highlight of the application of EA/TEAS is linked to analgesia. Acupuncture is acknowledged as one of the analgesic methods in the field of pathological pain, including inflammatory pain and neuropathic pain. Abundant laboratory findings revealed that acupuncture can mobilize opioid peptides. Further, EA with different frequencies can specifically activate different kinds of opioid peptides as mentioned above to relieve pain. The time period needed for the full expression of the analgesic effect in humans is 30 min (Research Group of Acupuncture Anesthesia, Peking Medical College, 1974 1974 ). The effect remained during the period of stimulation, and started to decrease exponentially along with the termination of stimulation. When the electrical stimulation lasted for more than 40–60 min, the analgesic effect started to decline gradually, a phenomenon known as “acupuncture tolerance” (Chen and Han, 1992 1992 ; Cheing et al., 2003 2003 ). It should also be pointed out that one single session of EA merely increases the release of brain opioid peptides, while consecutive sessions of EA obviously up-regulate both the mRNA level and the content of opioid peptides in the central nervous system (Liang et al., 2010 2010 ). Taken together, 30 min seemed to be convenient for a single session and multiple sessions are necessary for chronic disorders. While the analgesic effect of EA/TEAS is mainly mediated by opioid peptides and can be blocked by opioid receptor antagonist naloxone, this may not the sole determinant for acupuncture-induced analgesia (Sun et al., 2003 2003 ). Monoamines have been known to play significant roles (Zhang et al., 2012 2012 ). Recent studies showed that signal integrators, such as transient receptor potential vanilloid type 1 and purinergic receptor P2X3, play important roles in acupuncture analgesia (Xu et al., 2011 2011 ; Jiang et al., 2013 2013 ). Concerning the choice of acupoints, Hegu (LI 4) is the most commonly used acupoint for analgesia, and Neiguan (PC 6) is known to be effective for antiemetic effect (Lee et al., 2013 2013 ; Zhang et al., 2013 2013 ). The combined stimulation of Hegu (LI 4) and Neiguan (PC 6) may meet the needs of the present study. Application of EA/TEAS in treating diminished ovarian reserve 1 According to TCM, the pathological situation of ovarian dysfunction is “deficiency of kidney, disharmony of Chong and Ren, stagnation of Qi and blood”. Therefore, invigorating kidney, promoting Qi, circulating blood, and regulating Chong and Ren are the principles for the treatment of diminished ovarian reserve (DOR). The commonly used acupoints include Guanyuan (CV 4), Tianshu (ST 25), Zhongji (CV 3), Zigong (EX-CA1), Sanyinjiao (SP 6), Shenshu (BL 23), Mingmen (GV 4), and Yaoyangguan (GV 3) (Mi et al., 2013 2013 ). EA at 2 Hz has a significant effect in strengthening the ovarian reserve (Qiu et al., 2012 2012 ). Application of EA/TEAS in improving the pregnancy rate after ET 1 A previous study found a single session of TEAS for 30 min after ET could increase the pregnancy rate by 13% (Zhang et al., 2011 2011 ). Two sessions of TEAS (24 h before ET and 30 min after ET) could increase it by 20% (Zhang et al., 2011 2011 ). Low frequency (2 Hz) electric stimulation is better than high frequency (100 Hz) stimulation, and the acupoints located in the trunk, such as Guilai (ST 29), Zigong (EX-CA1), Guanyuan (CV 4), and Shenshu (BL 23), are more helpful for embryo implantation and pregnancy than acupoints located in the limbs, such as Xuehai (SP 10), Diji (SP 8), Zusanli (ST 36), and Taixi (KI 3). Patients at age of 30–45 years find more benefits than those below 30 years. Application of EA/TEAS in treating oligospermia and asthenospermia 1 In a randomized, single-blind, placebo-controlled study reported by Dieterle et al. ( 2009 2009 ), a significantly higher percentage of motile sperm, but no effect on sperm concentration, was found after acupuncture, compared with placebo acupuncture. In a previous small sample clinical study, TEAS also could improve the sperm activity and the ratio of forward motile sperm in patients with oligospermia and asthenospermia after 2-month treatment at acupoints with Shenshu (BL 23), Zusanli (ST 36), and Guanyuan (CV 4) (Jin et al., 2016b 2016b ). In the rat model of asthenozoospermia induced by intragastric administration of ornidazole (400 mg/(kg·d)) once a day for 14 d, EA was significantly effective on all of the sperm motility indexes but not the sperm concentration, and EA treatment once every other day was more effective than treatment once per day (Jin et al., 2016a 2016a ). TEAS can increase the seminal content of neutral α-glucosidase, fructose, and the level of zinc, which maybe one of the mechanisms of EA/TEAS acting on sperm motility. Conclusions 1 The use of EA/TEAS combined with modern reproductive medicine makes acupuncture more popular in the field of assisted reproduction. In particular, TEAS is widely favored by patients owing to its advantages of easy-operation, non-invasive nature, and painless procedures. It might be regarded as a model of the integrated application of TCM and modern medicine. References H Achache , A Revel . Endometrial receptivity markers, the journey to successful embryo implantation . Hum Reprod Update , 2006 . 12 ( 6 ): 731 - 746 . (Available from: http://dx.doi.org/10.1093/humupd/dml004 http://dx.doi.org/10.1093/humupd/dml004 ) 18313809 . Endometrial receptivity markers, the journey to successful embryo implantation A Bjelica , S Nikolic . Development and achievements of assisted reproductive technology . Med Pregl , 2015 . 68 ( 9-10 ): 353 - 357 . (Available from: http://dx.doi.org/10.2298/MPNS1510353B http://dx.doi.org/10.2298/MPNS1510353B ) 7814640 . Development and achievements of assisted reproductive technology J Boivin , L Bunting , JA Collins , 等 . International estimates of infertility prevalence and treatment-seeking: potential need and demand for infertility medical care . Hum Reprod , 2007 . 22 ( 6 ): 1506 - 1512 . (Available from: http://dx.doi.org/10.1093/humrep/dem046 http://dx.doi.org/10.1093/humrep/dem046 ) 15475095 . International estimates of infertility prevalence and treatment-seeking: potential need and demand for infertility medical care GL Cheing , AY Tsui , SK Lo , 等 . Optimal stimulation duration of TENS in the management of osteoarthritic knee pain . J Rehabil Med , 2003 . 35 ( 2 ): 62 - 68 . (Available from: http://dx.doi.org/10.1080/16501970306116 http://dx.doi.org/10.1080/16501970306116 ) 2782426 . Optimal stimulation duration of TENS in the management of osteoarthritic knee pain XH Chen , JS Han . Optimal conditions for eliciting maximal electroacupuncture analgesia with DD mode of stimulation . Eur J Pharmacol , 1992 . 211 203 - 210 . 19330465 . Optimal conditions for eliciting maximal electroacupuncture analgesia with DD mode of stimulation W Cui , J Li , W Sun , 等 . Effect of electroacupuncture on oocyte quality and pregnancy for patients with PCOS undergoing in vitro fertilization and embryo transfervitro fertilization and embryo transfer . Chin Acupunct Mox , 2011 . 31 ( 8 ): 687 - 690 . (in Chinese) 14578723 . Effect of electroacupuncture on oocyte quality and pregnancy for patients with PCOS undergoing in vitro fertilization and embryo transfervitro fertilization and embryo transfer S Dieterle , C Li , G Robert , 等 . A prospective randomized placebo-controlled study of the effect of acupuncture in infertile patients with severe oligoasthenozoospermia . Fertil Steril , 2009 . 92 ( 4 ): 1340 - 1343 . (Available from: http://dx.doi.org/10.1016/j.fertnstert.2009.02.041 http://dx.doi.org/10.1016/j.fertnstert.2009.02.041 ) 22580944 . A prospective randomized placebo-controlled study of the effect of acupuncture in infertile patients with severe oligoasthenozoospermia M Erdem , A Erdem , K Biberoglu , 等 . Age-related changes in ovarian volume, antral follicle counts and basal follicle stimulating hormone levels: comparison between fertile and infertile women . Gynecol Endocrinol , 2003 . 17 ( 3 ): 199 - 205 . (Available from: http://dx.doi.org/10.1080/713603248 http://dx.doi.org/10.1080/713603248 ) 16429145 . Age-related changes in ovarian volume, antral follicle counts and basal follicle stimulating hormone levels: comparison between fertile and infertile women SC Esteves , P Chan . A systematic review of recent clinical practice guidelines and best practice statements for the evaluation of the infertile male . Int Urol Nephrol , 2015 . 47 ( 9 ): 1441 - 1456 . (Available from: http://dx.doi.org/10.1007/s11255-015-1059-0 http://dx.doi.org/10.1007/s11255-015-1059-0 ) 17396243 . A systematic review of recent clinical practice guidelines and best practice statements for the evaluation of the infertile male G Griesinger , PJ Verweij , D Gates , 等 . Prediction of ovarian hyperstimulation syndrome in patients treated with corifollitropinalfa or rFSH in a GnRH antagonist protocol . PLoS ONE , 2016 . 11 ( 3 ): e0149615 (Available from: http://dx.doi.org/10.1371/journal.pone.0149615 http://dx.doi.org/10.1371/journal.pone.0149615 ) 18480297 . Prediction of ovarian hyperstimulation syndrome in patients treated with corifollitropinalfa or rFSH in a GnRH antagonist protocol JS Han . Acupuncture: neuropeptide release produced by electrical stimulation of different frequencies . Trends Neurosci , 2003 . 26 ( 1 ): 17 - 22 . (Available from: http://dx.doi.org/10.1016/S0166-2236(02)00006-1 http://dx.doi.org/10.1016/S0166-2236(02)00006-1 ) 10465764 . Acupuncture: neuropeptide release produced by electrical stimulation of different frequencies JS Han . Acupuncture analgesia: areas of consensus and controversy . Pain , 2011 . 152 ( 3 Suppl. ): S41 - S48 . (Available from: http://dx.doi.org/10.1016/j.pain.2010.10.012 http://dx.doi.org/10.1016/j.pain.2010.10.012 ) 9856975 . Acupuncture analgesia: areas of consensus and controversy JS Han , L Terenius . Neurochemical basis of acupuncture analgesia . Annu Rev Pharmacol Toxicol , 1982 . 22 ( 1 ): 193 - 220 . (Available from: http://dx.doi.org/10.1146/annurev.pa.22.040182.001205 http://dx.doi.org/10.1146/annurev.pa.22.040182.001205 ) 20061917 . Neurochemical basis of acupuncture analgesia JS Han , YS Ho . Global trends and performances of acupuncture research . Neurosci Biobehav Rev , 2011 . 35 ( 3 ): 680 - 687 . (Available from: http://dx.doi.org/10.1016/j.neubiorev.2010.08.006 http://dx.doi.org/10.1016/j.neubiorev.2010.08.006 ) 11468491 . Global trends and performances of acupuncture research JS Han , XH Chen , SL Sun , 等 . Effect of low-and high-frequency TENS on Met-enkephalin-Arg-Phe and dynorphin A immunoreactivity in human lumbar CSF . Pain , 1991 . 47 ( 3 ): 295 - 298 . (Available from: http://dx.doi.org/10.1016/0304-3959(91)90218-M http://dx.doi.org/10.1016/0304-3959(91)90218-M ) 9087683 . Effect of low-and high-frequency TENS on Met-enkephalin-Arg-Phe and dynorphin A immunoreactivity in human lumbar CSF KÖ Hançerlioğullarıa , T Soyer , A Tosun , 等 . Is B-flow USG superior to Color Doppler USG for evaluating blood flow patterns in ovarian torsion? . J Pediatr Surg , 2015 . 50 ( 7 ): 1156 - 1161 . (Available from: http://dx.doi.org/10.1016/j.jpedsurg.2014.08.028 http://dx.doi.org/10.1016/j.jpedsurg.2014.08.028 ) 19286955 . Is B-flow USG superior to Color Doppler USG for evaluating blood flow patterns in ovarian torsion? E Jedel , F Labrie , A Odén , 等 . Impact of electro-acupuncture and physical exercise on hyperandrogenism and oligo/amenorrhea in women with polycystic ovary syndrome: a randomized controlled trial . Am J Physiol Endocrinol Metab , 2011 . 300 ( 1 ): E37 - E45 . (Available from: http://dx.doi.org/10.1152/ajpendo.00495.2010 http://dx.doi.org/10.1152/ajpendo.00495.2010 ) 17035425 . Impact of electro-acupuncture and physical exercise on hyperandrogenism and oligo/amenorrhea in women with polycystic ovary syndrome: a randomized controlled trial YL Jiang , XH Yin , YF Shen , 等 . Low frequency electroacupuncture alleviated spinal nerve ligation induced mechanical allodynia by inhibiting TRPV1 upregulation in ipsilateral undamaged dorsal root ganglia in rats . Evid-Based Complement Alternat Med , 2013 . 2013 170910 (Available from: http://dx.doi.org/10.1155/2013/170910 http://dx.doi.org/10.1155/2013/170910 ) 9263742 . Low frequency electroacupuncture alleviated spinal nerve ligation induced mechanical allodynia by inhibiting TRPV1 upregulation in ipsilateral undamaged dorsal root ganglia in rats ZR Jin , BH Liu , WH Tang . Clinical trial of transcutanclus electrical acupoint stimulation for the treatment of patients with asthenozoospermia . Chin J Male Sci, in press , 2016 . (in Chinese) 1737457 . Clinical trial of transcutanclus electrical acupoint stimulation for the treatment of patients with asthenozoospermia ZR Jin , BH Liu , J Cai . Experimental study for the treatment of asthenozoospermia by electroacupuncture in rats . Acupunct Res, in press , 2016 . (in Chinese) 16809373 . Experimental study for the treatment of asthenozoospermia by electroacupuncture in rats J Johansson , L Redman , PP Veldhuis , 等 . Acupuncture for ovulation induction in polycystic ovary syndrome: a randomized controlled trial . Am J Physiol Endocrinol Metab , 2013 . 304 ( 9 ): E934 - E943 . (Available from: http://dx.doi.org/10.1152/ajpendo.00039.2013 http://dx.doi.org/10.1152/ajpendo.00039.2013 ) 20862451 . Acupuncture for ovulation induction in polycystic ovary syndrome: a randomized controlled trial F Kagitani , S Uchida , H Hotta , 等 . Manual acupuncture needle stimulation of the rat hindlimb activates groups I, II, III and IV single afferent nerve fibers in the dorsal spinal roots . Jpn J Physiol , 2005 . 55 ( 3 ): 149 - 155 . (Available from: http://dx.doi.org/10.2170/jjphysiol.R2120 http://dx.doi.org/10.2170/jjphysiol.R2120 ) 11327739 . Manual acupuncture needle stimulation of the rat hindlimb activates groups I, II, III and IV single afferent nerve fibers in the dorsal spinal roots S Lee , MS Lee , DH Choi , 等 . Electroacupuncture on PC6 prevents opioid-induced nausea and vomiting after laparoscopic surgery . Chin J Integr Med , 2013 . 19 ( 4 ): 277 - 281 . (Available from: http://dx.doi.org/10.1007/s11655-013-1425-7 http://dx.doi.org/10.1007/s11655-013-1425-7 ) 12044376 . Electroacupuncture on PC6 prevents opioid-induced nausea and vomiting after laparoscopic surgery H Lei , LC Feng . Study on effects of acupuncture on menstruation and endocrine in patients of normal body weight with polycystic ovary syndrome . World J Acupunct Mox , 2014 . 24 ( 2 ): 10 - 14 . (Available from: http://dx.doi.org/10.1016/S1003-5257(14)60018-0 http://dx.doi.org/10.1016/S1003-5257(14)60018-0 ) 12092863 . Study on effects of acupuncture on menstruation and endocrine in patients of normal body weight with polycystic ovary syndrome R Li , W Sun , Y Lin , 等 . Application of transcutaneous electrical acupoint stimulation in reproductive medicine: a group consensus . Reprod Contraception , 2016 . 7 ( 36 ): 211 - 219 . (in Chinese) 4599247 . Application of transcutaneous electrical acupoint stimulation in reproductive medicine: a group consensus J Liang , XJ Ping , YJ Li , 等 . Morphine-induced conditioned place preference in rats is inhibited by electroacupuncture at 2 Hz: role of enkephalin in the nucleus accumbens . Neuropharmacology , 2010 . 58 ( 1 ): 233 - 240 . (Available from: http://dx.doi.org/10.1016/j.neuropharm.2009.07.007 http://dx.doi.org/10.1016/j.neuropharm.2009.07.007 ) 3414799 . Morphine-induced conditioned place preference in rats is inhibited by electroacupuncture at 2 Hz: role of enkephalin in the nucleus accumbens HX Liu , JB Tian , F Luo , 等 . Repeated 100 Hz TENS for the treatment of chronic inflammatory hyperalgesia and suppression of spinal release of substance P in monoarthriticrats . Evid-Based Complement Alternat Med , 2007 . 4 ( 1 ): 65 - 75 . (Available from: http://dx.doi.org/10.1093/ecam/nel056 http://dx.doi.org/10.1093/ecam/nel056 ) 2259080 . Repeated 100 Hz TENS for the treatment of chronic inflammatory hyperalgesia and suppression of spinal release of substance P in monoarthriticrats H Mi , AL Gong , W Sun , 等 . Effect of transcutaneous electrical acupoint stimulation on 30 patients with poor ovarian function . J Shandong Univ TCM , 2013 . 37 ( 6 ): 495 - 496 . (in Chinese) 22237237 . Effect of transcutaneous electrical acupoint stimulation on 30 patients with poor ovarian function D Michikami , A Kamiya , T Kawada , 等 . Short-term electroacupuncture at Zusanli resets the arterial baroreflex neural arc toward lower sympathetic nerve activity . Am J Physiol Heart Circ Physiol , 2006 . 291 ( 1 ): H318 - H326 . (Available from: http://dx.doi.org/10.1152/ajpheart.00975.2005 http://dx.doi.org/10.1152/ajpheart.00975.2005 ) 15718257 . Short-term electroacupuncture at Zusanli resets the arterial baroreflex neural arc toward lower sympathetic nerve activity MF Mutlu , A Erdem . Evaluation of ovarian reserve in infertile patients . J Turk Ger Gynecol Assoc , 2012 . 13 ( 3 ): 196 - 203 . (Available from: http://dx.doi.org/10.5152/jtgga.2012.28 http://dx.doi.org/10.5152/jtgga.2012.28 ) 16339177 . Evaluation of ovarian reserve in infertile patients S Neyens , D de Neubourg , K Peeraer , 等 . Is there a correlation between the number of follicular flushings, oocyte/embryo quality and pregnancy rate in assisted reproductive technology cycles? Results from a prospective study . Gynecol Obstet Invest , 2016 . 81 ( 1 ): 34 - 40 . (Available from: http://dx.doi.org/10.1159/000434750 http://dx.doi.org/10.1159/000434750 ) 10393329 . Is there a correlation between the number of follicular flushings, oocyte/embryo quality and pregnancy rate in assisted reproductive technology cycles? Results from a prospective study A Polisca , R Zelli , A Troisi , 等 . Power and pulsed Doppler evaluation of ovarian hemodynamic changes during diestrus in pregnant and nonpregnant bitches . Theriogenology , 2013 . 79 ( 2 ): 219 - 224 . (Available from: http://dx.doi.org/10.1016/j.theriogenology.2012.08.005 http://dx.doi.org/10.1016/j.theriogenology.2012.08.005 ) 15845718 . Power and pulsed Doppler evaluation of ovarian hemodynamic changes during diestrus in pregnant and nonpregnant bitches WX Qiu , XY Zhang , XX Lin , 等 . The clinical trial on the effects of using TEAS on the quality of embryo and the outcomes in low ovarian reaction patients . Chin J Hum Sex , 2012 . 21 ( 7 ): 22 - 24 . 16807402 . The clinical trial on the effects of using TEAS on the quality of embryo and the outcomes in low ovarian reaction patients BH Rashidi , ES Tehrani , NA Hamedani , 等 . Effects of acupuncture on the outcome of in vitro fertilisation and intracytoplasmic sperm injection in women with polycystic ovarian syndrome . Acupunct Med , 2013 . 31 ( 2 ): 151 - 156 . (Available from: http://dx.doi.org/10.1136/acupmed-2012-010198 http://dx.doi.org/10.1136/acupmed-2012-010198 ) 17215439 . Effects of acupuncture on the outcome of in vitro fertilisation and intracytoplasmic sperm injection in women with polycystic ovarian syndrome Research Group of Acupuncture Anesthesia, Peking Medical College Effect of acupuncture on the pain threshold of human skin . Chin Med J , 1973 . 3 151 - 157 . (in Chinese) 10776193 . Effect of acupuncture on the pain threshold of human skin Research Group of Acupuncture Anesthesia, Peking Medical College The role of some neurotransmitters of brain in finger-acupuncture analgesia . Sci Sin , 1974 . 17 ( 1 ): 112 - 130 . 16457993 . The role of some neurotransmitters of brain in finger-acupuncture analgesia RL Schild , S Holthaus , J D'Alquen , 等 . Quantitative assessment of subendometrial blood flow by three-dimensional-ultrasound is an important predictive factor of implantation in an in-vitro fertilization programme . Hum Reprod , 2000 . 15 ( 1 ): 89 - 94 . (Available from: http://dx.doi.org/10.1093/humrep/15.1.89 http://dx.doi.org/10.1093/humrep/15.1.89 ) 12519083 . Quantitative assessment of subendometrial blood flow by three-dimensional-ultrasound is an important predictive factor of implantation in an in-vitro fertilization programme E Stener-Victorin , C Lindholm . Immunity and β-endorphin concentrations in hypothalamus and plasma in rats with steroid-induced polycystic ovaries: effect of low-frequency electroacupuncture . Biol Reprod , 2004 . 70 ( 2 ): 329 - 333 . (Available from: http://dx.doi.org/10.1095/biolreprod.103.022368 http://dx.doi.org/10.1095/biolreprod.103.022368 ) 15458441 . Immunity and β-endorphin concentrations in hypothalamus and plasma in rats with steroid-induced polycystic ovaries: effect of low-frequency electroacupuncture E Stener-Victorin , U Waldenstro , M Wikland , 等 . Electro-acupuncture as a peroperative analgesic method and its effects on implantation rate and neuropeptide Y concentrations in follicular fluid . Hum Reprod , 2003 . 18 ( 7 ): 1454 - 1460 . (Available from: http://dx.doi.org/10.1093/humrep/deg277 http://dx.doi.org/10.1093/humrep/deg277 ) 10319771 . Electro-acupuncture as a peroperative analgesic method and its effects on implantation rate and neuropeptide Y concentrations in follicular fluid RQ Sun , HC Wang , Z Jing , 等 . Electroacupuncture at 2 Hz relieved mechanical allodynia and cold-induced ongoing pain in rat model of neuropathic pain . Chin J Pain Med , 2003 . 4 ( 9 ): 220 - 224 . (in Chinese) 22889236 . Electroacupuncture at 2 Hz relieved mechanical allodynia and cold-induced ongoing pain in rat model of neuropathic pain Q Wang , L Mao , JS Han . Comparison of the antinociceptive effects induced by electroacupuncture and transcutaneous electrical nerve stimulation in the rat . Inrern J Neuromence , 1992 . 65 117 - 129 . 22470070 . Comparison of the antinociceptive effects induced by electroacupuncture and transcutaneous electrical nerve stimulation in the rat SM Wang , ZN Kain , P White . Acupuncture analgesia: I. The scientific basis . Anesth Analg , 2008 . 106 ( 2 ): 602 - 610 . (Available from: http://dx.doi.org/10.1213/01.ane.0000277493.42335.7b http://dx.doi.org/10.1213/01.ane.0000277493.42335.7b ) 18905223 . Acupuncture analgesia: I. The scientific basis L Wildt , T Sir-Petermann , G Leyendecker , 等 . Opiate antagonist treatment of ovarian failure . Hum Reprod , 1993 . 8 ( Suppl. 2 ): 168 - 174 . (Available from: http://dx.doi.org/10.1093/humrep/8.suppl_2.168 http://dx.doi.org/10.1093/humrep/8.suppl_2.168 ) 18045543 . Opiate antagonist treatment of ovarian failure Y Wu , N Robinson , PJ Hardiman , 等 . Acupuncture for treating polycystic ovary syndrome: guidance for future randomized controlled trials . J Zhejiang Univ-Sci B (Biomed & Biotechnol) , 2016 . 17 ( 3 ): 169 - 180 . (Available from: http://dx.doi.org/10.1631/jzus.B1500301 http://dx.doi.org/10.1631/jzus.B1500301 ) 6423247 . Acupuncture for treating polycystic ovary syndrome: guidance for future randomized controlled trials GY Xu , G Li , N Liu , 等 . Mechanisms underlying purinergic P2X3 receptor-mediated mechanical allodynia induced in diabetic rats . Mol Pain , 2011 . 7 60 (Available from: http://dx.doi.org/10.1186/1744-8069-7-60 http://dx.doi.org/10.1186/1744-8069-7-60 ) 407854 . Mechanisms underlying purinergic P2X3 receptor-mediated mechanical allodynia induced in diabetic rats MJ Zhan , HM Wang . Observation on therapeutic effects of electroacupuncture for obesity polycystic ovary syndrome . J Acupunct Tuina Sci , 2008 . 6 ( 2 ): 90 - 93 . (Available from: http://dx.doi.org/10.1007/s11726-008-0090-4 http://dx.doi.org/10.1007/s11726-008-0090-4 ) 20178504 . Observation on therapeutic effects of electroacupuncture for obesity polycystic ovary syndrome J Zhang , X Wang , R Lü . Analgesic effect of acupuncture at Hegu (LI 4) on transvaginal oocyte retrieval with ultrasonography . J Tradit Chin Med , 2013 . 33 ( 3 ): 294 - 297 . (Available from: http://dx.doi.org/10.1016/S0254-6272(13)60167-3 http://dx.doi.org/10.1016/S0254-6272(13)60167-3 ) 9843909 . Analgesic effect of acupuncture at Hegu (LI 4) on transvaginal oocyte retrieval with ultrasonography R Zhang , XJ Feng , Q Guan , 等 . Increase of success rate for women undergoing embryo transfer by transcutaneous electrical acupoint stimulation: a prospective randomized placebo-controlled study . Fertil Steril , 2011 . 96 ( 4 ): 912 - 916 . (Available from: http://dx.doi.org/10.1016/j.fertnstert.2011.07.1093 http://dx.doi.org/10.1016/j.fertnstert.2011.07.1093 ) 20553904 . Increase of success rate for women undergoing embryo transfer by transcutaneous electrical acupoint stimulation: a prospective randomized placebo-controlled study T Zhang , Y He , Y Wang , 等 . The role of three-dimensional power Doppler ultrasound parameters measured on hCG day in the prediction of pregnancy during in vitro fertilization treatment . Eur J Obstet Gynecol Reprod Biol , 2016 . 203 66 - 71 . (Available from: http://dx.doi.org/10.1016/j.ejogrb.2016.05.016 http://dx.doi.org/10.1016/j.ejogrb.2016.05.016 ) 3094358 . The role of three-dimensional power Doppler ultrasound parameters measured on hCG day in the prediction of pregnancy during in vitro fertilization treatment Y Zhang , RX Zhang , M Zhang , 等 . Electroacupuncture inhibition of hyperalgesia in an inflammatory pain rat model: involvement of distinct spinal serotonin and norepinephrine receptor subtypes . Br J Anaesth , 2012 . 109 ( 2 ): 245 - 252 . (Available from: http://dx.doi.org/10.1093/bja/aes136 http://dx.doi.org/10.1093/bja/aes136 ) 17109136 . Electroacupuncture inhibition of hyperalgesia in an inflammatory pain rat model: involvement of distinct spinal serotonin and norepinephrine receptor subtypes H Zhao , ZZ Tian , BY Chen . Electroacupuncture stimulates hypothalamic aromatization . Brain Res , 2005 . 1037 ( 1-2 ): 164 - 170 . (Available from: http://dx.doi.org/10.1016/j.brainres.2005.01.004 http://dx.doi.org/10.1016/j.brainres.2005.01.004 ) 11574339 . Electroacupuncture stimulates hypothalamic aromatization ZQ Zhao . Neural mechanism underlying acupuncture analgesia . Prog Neurobiol , 2008 . 85 ( 4 ): 355 - 375 . (Available from: http://dx.doi.org/10.1016/j.pneurobio.2008.05.004 http://dx.doi.org/10.1016/j.pneurobio.2008.05.004 ) 6826732 . Neural mechanism underlying acupuncture analgesia J Zhou , F Qu . Treating gynaecological disorders with traditional Chinese medicine: a review . Afr J Tradit Complement Altern Med , 2009 . 6 ( 4 ): 494 - 517 . 11574338 . Treating gynaecological disorders with traditional Chinese medicine: a review Compliance with ethics guidelines Fan QU, Rong LI, Wei SUN, Ge LIN, Rong ZHANG, Jing YANG, Li TIAN, Guo-gang XING, Hui JIANG, Fei GONG, Xiao-yan LIANG, Yan MENG, Jia-yin LIU, Li-ying ZHOU, Shu-yu WANG, Yan WU, Yi-jing HE, Jia-yu YE, Song-ping HAN, and Ji-sheng HAN declare that they have no conflict of interest. This article does not contain any studies with human or animal subjects performed by any of the authors. 10.1631/jzus.B1600437 Project supported by the Special Research Fund for the Public Welfare Industry of Health of China (No. 201302013) 2016-10-02 2017-02-08 2016-10-12 2022-01-05 Copyright © Zhejiang University and Springer-Verlag Berlin Heidelberg 2017 2017 Journal of Zhejiang University-SCIENCE B (Biomedicine and Biotechnology) 03 18