Magnetotherapy, alternative medicines, Hippocratic oath

Caring for patients is the central objective of health care. The Hippocratic Oath, which is sworn by all physicians and forgotten by many, does not promise glory but stresses the obligation to care for patients. But "caring for patients", in these days of high-technology medicine, is more than a matter of laying of hands by physicians who, by and large, are ignorant of basic science and engineering, and employing methods that are not well supported by good scientific studies. Close collaboration of physicians, biomedical engineers, and basic medical scientists is needed to help clarify the confusion and misuse surrounding the application of magnetic fields for medicine. It is time to move past the stage of amateur research and claims published on the Internet, and on to well controlled double-blinded studies with adequate engineering support and papers published in conventional scientific journals. While the prospects do not look good for a breakthrough in therapies using weak magnetic fields, perhaps something useful will be uncovered.

Advocates say that therapy with magnets or pulsed magnetic fields is effective in reducing pain. However, I have seen no good studies demonstrating that. Conversely, there are good reports showing that such devices are ineffective, for example the recent double-blinded, placebocontrolled paper by Fernandez et al [1]. These authors concluded that pulse magnetic field therapy had no effect on pain.
And where is the evidence that such treatments are safe? Advocates argue that the treatments are without adverse effect. I am aware of several cases in which patients have apparently suffered from severe pain related to magnetotherapy after hip replacement or other orthopedic procedure. One might conjecture that heating of implants by the eddy currents induced in them by the varying magnetic fields might be a factor, in combination with the proximity of the implants to damaged and consequently sensitive tissues. Admittedly, my data are anecdotal and, to the best of my knowledge, there has been no systematic follow-up of patients treated with pulsed magnetic fields that might have uncovered any such effects had they occurred.
The possible uses of magnetic, and later on, electromagnetic fields have fascinated people for many years. Among the artifacts displayed at the Bakken Museum, in Minneapolis, MN, is an impressive solenoid coil from the 19 th Century, in which a patient stood while an electric current circulated through the coil. The patient's whole body was immersed in a magnetic field supposedly to accomplish some healing action. The attractiveness of such treatments might result from the placebo effect, or perhaps the certain degree of mystery surrounding them; the human being (and the human body, too) often act in funny unexpected strange ways [2].
A recent search identified more than 58,000 websites on magneto-therapy. One of them [3], says (after deleting a few irrelevant lines and even a few errors):

and (3) electronic interactions. Magnetic field exhibits the following activities: (1) vasodilatation; (2) analgesic action; (3) anti-inflammatory action; (4) spasmolytical activity; (5) healing acceleration; (6) anti-edematous activity.
It is known that PMF affects cellular level. PMF causes activation of enzymatic processes, activation of the metabolic transfers and functions of cellular membrane. Cellular respiration is activated in the exposed area. PMF produces positive changes in immunological condition of the patient, vasodilatation of the arterial part of capillaries, decreases blood coagulation. This is quite a list. The website describes some mechanisms of action of pulsed magnetic field therapy and refers to an international congress on the subject held in London in 1996. It even mentions clinical tests, simply describing their results as "excellent". Claims for such a medical panacea raise doubts and reservations. This skepticism is supported by recent articles and editorials in the conventional scientific literature. Finegold  More than 50 years ago my father, Máximo Valentinuzzi, carried out several studies trying to separate the weed from the good herb in magneto biology [5]; more recently I reviewed the field in historical perspective [6].
The broad rubrics of magneto biology and biomagnetism include well-established and scientifically respectable subjects such as the magnetocardiogram, magnetoencephalogram, magnetomyogram and stimulation of the brain using very intense magnetic field pulses. But magneto-therapy, particularly as it is described in numerous Websites, has a lot of quackery as well. Physicians prescribe magneto-therapy without enough knowledge, kinesiologists and physical therapists use magneto-therapy indiscriminately, medical insurance companies reimburse for such procedures (often inadequately, leaving patients responsible for costs for partially covered fees), and magneto-therapy equipment can be freely purchased on the Internet. Obviously, many sly people make money out of ignorance of the rest while endangering the health of innocent patients who, one way or another must pay the bills.
I do not categorically deny the possibility of beneficial effects of therapy using weak magnetic fields; perhaps, some do exist. My complaint is about the worldwide clinical use of electromagnetic fields without proper scientific proof and adequate trials. The list of beneficial effects that have been claimed for magnetic field therapy is so large that a whole laboratory could spend many years trying to prove them.
This situation contrasts notably with other areas of medical knowledge, such as the effects of vaccines, antibiotics, hormone treatments, beta blockers, contraceptive pills, aspirin, vitamins, cardiac pacemakers, implanted defibrillators, and the like, which have been subject to long and hard research, including investigations into probable side effects. Magneto-therapy, should it aspire to a similar acceptance, would face a similar period of rigorous study using standard methods of clinical research [7]. Companies selling such devices should sponsor adequate tests along the lines of those used for other medical devices. Besides, perhaps health agencies (either in the US or abroad) may view these as "alternative medicine" and do not demand the same level of proof that FDA demands for medical devices.
Caring for patients is the central objective of health care. The Hippocratic Oath, which is sworn by all physicians and forgotten by many, does not promise glory but stresses the obligation to care for patients [8]. But "caring for patients", in these days of high-technology medicine, is more than a matter of laying of hands by physicians, who by and large are ignorant of basic science and engineering, employing methods that are not well supported by good scientific studies. Close collaboration of physicians, biomedical engineers, and basic medical scientists is needed to help clarify the confusion and misuse surrounding the application of magnetic fields for medicine. It is time to move past the stage of amateur research and claims published on the Internet, and on to well controlled double-blinded studies with adequate engineering support and papers published in conventional scientific journals. While the prospects do not look good for a breakthrough in therapies using weak magnetic fields, perhaps something useful will be uncovered.