Research |
Conclusion |
Systematic reviews |
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Lee MS et al. Acupuncture for treating menopausal hot flushes: a systematic review. Climacteric. 2009; 12: 16-25. |
A systematic review, including 6 randomised controlled trials, which assessed the effectiveness of acupuncture as a treatment option for menopausal hot flushes. Four trials compared the effects of acupuncture with sham acupuncture on nonacupuncture points. All of these trials failed to show specific effects on menopausal hot flush frequency, severity or index. One trial found no effect of acupuncture on hot flush frequency and severity compared with sham acupuncture on acupuncture points that are not relevant for the treatment of hot flushes. The remaining trial tested acupuncture against non-penetrating acupuncture on non-acupuncture points. Its results suggested favorable effects of acupuncture on menopausal hot flush severity. However, this study was too small to generate reliable findings. The reviewers concluded that sham-controlled randomised controlled trials have failed to show specific effects of acupuncture for the control of menopausal hot flushes. |
Cho SH, Whang WW. Acupuncture for vasomotor menopausal symptoms: A systematic review. Menopause 2009; 16: 1065-73. |
A systematic review, including 11 randomised controlled trials with a total of 764 patients, which assessed whether acupuncture therapy reduces vasomotor menopausal symptoms and evaluated the adverse effects of acupuncture therapy. Six trials compared acupuncture treatment to sham or placebo acupuncture. Only one study using a non-penetrating placebo needle found a significant difference in the severity outcomes of hot flashes between groups (mean difference, 0.48, 95% CI, 0.05 to 0.91). Five studies reported a reduced frequency of hot flushes within groups; however, none found a significant difference between groups. An analysis of the outcomes of the trials that compared acupuncture with hormone therapy or oryzanol for reducing vasomotor symptoms showed that acupuncture was superior. Three trials reported minimal acupuncture-related adverse events. The reviewers concluded that there was no evidence from trials that acupuncture is an effective treatment in comparison to sham acupuncture for reducing menopausal hot flushes, but that some studies have shown that acupuncture therapies are better than hormone therapy |
Review |
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Borud E, White A. A review of acupuncture for menopausal problems. Maturitas 2010; 66: 131-4 |
A review paper that looked at clinical trials of acupuncture for menopausal symptoms. The reviewers found that, for natural menopause, one large study has shown acupuncture to be superior to self-care alone in reducing the number of hot flushes and improving the quality of life; five small studies have been unable to demonstrate that the effect of acupuncture is limited to any particular points, as traditional theory would suggest; and one study showed acupuncture was superior to blunt needle for flash frequency but not intensity. For flushes associated with induced menopause, clearly acupuncture is useful for reducing flushes in clinical practice, but there is mixed evidence on the nature of the effect: one trial found genuine acupuncture superior to control needling, but another showed no significant difference between acupuncture and blunt needle. The possible mechanisms of acupuncture for hot flushes are discussed |
Clinical studies |
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Kim KH et al. Effects of acupuncture on hot flashes in perimenopausal and postmenopausal women-a multicenter randomized clinical trial. Menopause 2010; 17: 269-80. |
A randomised controlled trial that evaluated the effectiveness of acupuncture plus usual care for relief of hot flushes and menopause-related symptoms compared with usual care alone in perimenopausal or postmenopausal women.. The primary outcome was the mean change in the average 24-hour hot flash score (combining frequency and severity of flushes) at week 4 from baseline. The secondary outcome was the mean change in menopause-related symptoms as estimated by the Menopause Rating Scale questionnaire. Follow-up assessment at week 8 was conducted in the treatment group only. The mean change in the average 24-hour hot flush score was -16.57 in the treatment group and -6.93 in the control group (p<0.0001). The total Menopause Rating Scale score, as well as the subscale scores for the psychological, somatic, and urogenital dimensions of menopause, showed significant improvement in the acupuncture group compared with the control group (p<0.001). The researchers concluded that their results suggest that acupuncture in addition to usual care is associated with marked clinical improvement in hot flushes and menopause-related symptoms in perimenopausal or postmenopausal women. |
Venzke L et al. A randomized trial of acupuncture for vasomotor symptoms in post-menopausal women. Complementary Therapies in Medicine 2010; 18: 59-66. |
A randomised controlled trial that aimed to determine whether acupuncture would relieve the vasomotor symptoms of postmenopausal women. Fifty one women were randomly assigned to receive 12 weeks of treatment with either Traditional Chinese Medicine (TCM) acupuncture or shallow needle (sham) acupuncture. They all kept a diary recording their hot flashes each day. At baseline, study participants filled out Greene Climacteric Scales and the Beck Depression and Anxiety Inventories. These same outcomes were also measured at week 4 of treatment and at 1 week and 12 weeks after treatment. Both groups of women showed statistically significant improvement on all study parameters, but there was no difference between them. The researchers concluded that the results showed that both TCM and sham acupuncture were effective treatments of postmenopausal vasomotor symptoms, and that shallow needling may have therapeutic effects in itself, thus reducing its utility as a " placebo" control for ‘true’ acupuncture |
Borud EK et al. The Acupuncture on hot flushes among menopausal women (ACUFLASH) study, a randomized controlled trial. Menopause 2009; 16: 484-93. Borud EK et al. The acupuncture on hot flashes among menopausal women study: Observational follow up results at 6 and 12 months. Menopause 2010; 17: 262-8. |
A randomised controlled trial that compared the effectiveness of individualized acupuncture plus self-care versus self-care alone on hot flushes and health-related quality of life in 267 postmenopausal women. Hot flush frequency (the primary endpoint) decreased by 5.8 per 24 hours in the acupuncture group and 3.7 per 24 hours in the control group (p<0.001). Hot flush intensity decreased by 3.2 units in the acupuncture group and 1.8 units in the control group (p<0.001). The acupuncture group experienced statistically significant improvements in the vasomotor, sleep, and somatic symptoms dimensions of the Women's Health Questionnaire compared with the control group. Follow-up at 6 and 12 months found no significant difference between the groups. The researchers concluded that acupuncture can contribute to a more rapid reduction in hot flushes and increase in health-related quality of life in postmenopausal women, but probably has no long-term effects. |
Park JE et al. Moxibustion for treating menopausal hot flashes: a randomized clinical trial. Menopause 2009; 16: 660-5. |
A randomised controlled trial that evaluated the effect of moxibustion on hot flashes in 51 perimenopausal and postmenopausal women compared to a waiting list (control). The primary outcome measures were frequency and severity of hot flashes. By week 4, the difference in severity and frequency of hot flashes had become statistically significant between the treatment groups and the control participants. The researchers concluded that their results suggest that moxibustion reduces both the frequency and severity of menopausal hot flashes as compared with those in control participants. |
Avis NE et al. A randomized, controlled pilot study of acupuncture treatment for menopausal hot flashes. Menopause 2008; 15: 1070- 8 |
A study that investigated the feasibility of conducting a randomised trial of the effect of acupuncture in decreasing hot flashes in peri- and postmenopausal women. Fifty-six women who had at least four hot flashes per day were given one of three treatment: usual care, sham acupuncture, or TCM acupuncture. Daily diaries were used to track frequency and severity of hot flashes. There was a significant decrease in mean frequency of hot flashes between weeks 1 and 8 across all groups (p=0.01), although the differences between the three study groups were not significant. However, the two acupuncture groups showed a significantly greater decrease than the usual care group (p<0.05), but did not differ from each other. Results followed a similar pattern for the hot flash index score. There were no significant effects for changes in hot flash interference, sleep, mood, health-related quality of life, or psychological well-being. The researchers concluded that their results suggest either that there is a strong placebo effect or that both traditional and sham acupuncture significantly reduce hot flash frequency |
Xia XH et al. Multicentral randomized controlled clinical trials about treatment of perimenopausal syndrome with electroacupuncture of sanyinjiao (SP 6) [Article in Chinese] . Zhen Ci Yan Jiu. 2008 Aug;33(4):262-6. |
A randomised controlled trial including 157 women with perimenopausal symptoms that compared electroacupuncture with nylestriol and medroxyprogesterone The therapeutic effect was evaluated by using a "symptoms-signs score scale", and changes in serum estradiol (E2), follicle stimulating hormone (FSH) and luteotrophic hormone (LH). The Kupperman index was determined before and after the treatment and decreased significantly and similarly in both groups (p<0.01). Serum FSH and LH decreased and serum E2 increased significantly in the acupuncture group (p<0.01). Serum LH and E2 levels were significantly lower with acupuncture than with medication (p<0.05). The researchers concluded that electroacupuncture is able to regulate serum E2, FSH and LH levels and effectively improve perimenopausal syndrom |
Research on mechanisms for acupuncture in general |
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Cheng KJ. Neuroanatomical basis of acupuncture treatment for some common illnesses. Acupunct Med 2009;27: 61-4. |
A review that looked at acupuncture treatment for some common conditions. It is found that, in many cases, the acupuncture points traditionally used have a neuroanatomical significance from the viewpoint of biomedicine. From this, the reviewers hypothesize that plausible mechanisms of action include intramuscular stimulation for treating muscular pain and nerve stimulation for treating neuropathies. |
Lee B et al. Effects of acupuncture on chronic corticosterone-induced depression-like behavior and expression of neuropeptide Y in the rats. Neuroscience Letters 2009; 453: 151-6. |
In animal studies, acupuncture has been found to significantly reduce anxiety-like behaviour, and increase brain levels of neuropeptide Y, the brain levels of which appear to correlate with reported anxiety |
Samuels N et al. Acupuncture for psychiatric illness: a literature review. Behav Med 2008; 34: 55-64 |
A literature review of acupuncture for psychiatric illness, which presents research that found acupuncture to increase central nervous system hormones, including ACTH, beta-endorphins, serotonin, and noradrenaline. It concludes that acupuncture can have positive effects on depression and anxiety |
Zhou Q et al. The effect of electroacupuncture on the imbalance between monoamine neurotransmitters and GABA in the CNS of rats with chronic emotional stress-induced anxiety. Int J Clin Acupunct 2008 ;17: 79-84. |
A study of the regulatory effect of electro-acupuncture on the imbalance between monoamine neurotransmitters and GABA in the central nervous system of rats with chronic emotional stressinduced anxiety. The levels of serotonin, noradrenaline and dopamine fell significantly, while GABA levels were significantly higher in the rats given acupuncture (P<0.05, or P<0.0). The researchers concluded that the anti-anxiety effect of electroacupuncture may relate to its regulation of the imbalance of neurotransmitters. |
Zijlstra FJ et al. Anti-inflammatory actions of acupuncture. Mediators Inflamm 2003;12: 59-69. |
A review that suggests a hypothesis for the anti-inflammatory action of acupuncture. Insertion of acupuncture needle initially stimulates production of beta-endorphins, calcitonin generelated peptide (CGRP) and substance P, leading to further stimulation of cytokines and nitric oxide (NO). While high levels of CGRP have been shown to be pro-inflammatory, CGRP in low concentrations exerts potent anti-inflammatory actions. Therefore, a frequently applied 'low-dose' treatment of acupuncture could provoke a sustained release of CGRP with anti-inflammatory activity, without stimulation of proinflammatory cells. |
Pomeranz B. Scientific basis of acupuncture. In: Stux G, Pomeranz B, eds. Acupuncture Textbook and Atlas. Heidelberg: Springer-Verlag; 1987:1-18. |
Needle activation of A delta and C afferent nerve fibres in muscle sends signals to the spinal cord, where dynorphin and enkephalins are released. Afferent pathways continue to the midbrain, triggering excitatory and inhibitory mediators in spinal cord. Ensuing release of serotonin and norepinephrine onto the spinal cord leads to pain transmission being inhibited both preand postsynaptically in the spinothalamic tract. Finally, these signals reach the hypothalamus and pituitary, triggering release of adrenocorticotropic hormones and beta-endorphin. |