Article

Efficacy of static magnetic field therapy in chronic pelvic pain: A double-blind pilot study

Department of Pharmacy Practice and Pharmacoeconomics, University of Tennessee Health Sciences Center, Memphis, USA.
American Journal of Obstetrics and Gynecology (Impact Factor: 3.97). 12/2002; 187(6):1581-7. DOI: 10.1067/mob.2002.128026
Source: PubMed

ABSTRACT The aim of the study was to determine the efficacy of static magnetic field therapy for the treatment of chronic pelvic pain (CPP) by measuring changes in pain relief and disability.
Thirty-two patients with CPP completed 2 weeks and 19 patients completed 4 weeks of randomized double-blind placebo-controlled treatment at a gynecology clinic. Active (500 G) or placebo magnets were applied to abdominal trigger points for 24 hour per day. The McGill Pain Questionnaire, Pain Disability Index, and Clinical Global Impressions Scale were outcome measures.
Patients receiving active magnets who completed 4 weeks of double-blind treatment had significantly lower Pain Disability Index (P <.05), Clinical Global Impressions-Severity (P <.05), and Clinical Global Impressions-Improvement (P <.01) scores than those receiving placebo magnets, but were more likely to correctly identify their treatment (P <.05).
SMF therapy significantly improves disability and may reduce pain when active magnets are worn continuously for 4 weeks in patients with CPP, but blinding efficacy is compromised.

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    • "Since Galen's indication to apply magnetic therapy for curing scars that are caused by infectious materials [Häfeli, 2007], several scientific experiments have been performed in order to understand the biological effect of external magnetic field exposure and to develop magnetic devices optimized for therapy. Recent studies on humans suggest chronic pain as a potential application field for magnetic therapy as a non-contact, non-invasive, and cheap physiotherapeutic method for osteoarthritis [Hulme et al., 2002], spine disorders [Linovitz et al., 2002], abdominal and genital pain [Holcomb et al., 2000], chronic pelvic pain [Brown et al., 2002], knee pain [Hinman et al., 2002], fibromyalgia [Alfano et al., 2001], myofascial pain syndrome [Smania et al., 2003], and diabetic neuropathic pain [Weintraub et al., 2009]. Precise human evaluation of the efficacy of several differently applied magnetic therapies has led to conflicting conclusions in meta-analysis; SMF therapy showed no benefits compared to placebo controls [Pittler et al., 2007]. "
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    ABSTRACT: Recent research demonstrated that exposure of mice to both inhomogeneous (3-477 mT) and homogeneous (145 mT) static magnetic fields (SMF) generated an analgesic effect toward visceral pain elicited by the intraperitoneal injection of 0.6% acetic acid. In the present work, we investigated behavioral responses such as writhing, entry avoidance, and site preference with the help of a specially designed cage that partially protruded into either the homogeneous (ho) or inhomogeneous (inh) SMF. Aversive effects, cognitive recognition of analgesia, and social behavior governed mice in their free locomotion between SMF and sham sides. The inhibition of pain response (I) for the 0-5, 6-20, and 21-30 min periods following the challenge was calculated by the formula I = 100 (1 - x/y) in %, where x and y represent the number of writhings in the SMF and sham sides, respectively. In accordance with previous measurements, an analgesic effect was induced in exposed mice (Iho = 64%, P < 0.0002 and Iinh = 62%, P < 0.002). No significant difference was found in the site preference (SMFho, inh vs. sham) indicating that SMF is neither aversive nor favorable. Comparison of writhings observed in the sham versus SMF side of the cage revealed that SMF exposure resulted in significantly fewer writhings than sham (Iho = 64%, P < 0.004 and Iinh = 81%, P < 0.03). Deeper statistical analysis clarified that the lateral SMF gradient between SMF and sham sides could be responsible for most of the analgesic effect (Iho = 91%, P < 0.02 and Iinh = 54%, P < 0.02). Bioelectromagnetics 34:385-396, 2013. © 2012 Wiley Periodicals, Inc.
    Bioelectromagnetics 07/2013; 34(5):385-96. DOI:10.1002/bem.21781 · 1.86 Impact Factor
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    • "Stationary magnets have been studied for pain of many different body areas, with varying reports of benefit. A summary of success from a number of different studies has been reported in the treatment of knee pain, chronic pelvic pain, postpolio pain, and carpal tunnel pain [69] [70] [71] [72] [73]. Little to no benefit was found in treating wrist pain, fibromyalgia, and low back pain, and no benefit in treating heel pain associated with plantar fascitis [74] [75] [76] [77]. "
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    • "Commercial claims for the efficacy of static magnets for a variety of salubrious effects often imply or aver that the magnets influence blood flow in a beneficial manner. However, in studies that report evidence of magnet related reduction of pain [Vallbona et al., 1997; Brown et al., 2002], edema [Man et al., 1999], or sympathetic diabetic neuropathy [Weintraub et al., 2003], the question of magnet related enhancement of blood flow has not been addressed. "
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