The Medical Letter on Drugs and Therapeutics
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Low-Voltage Electronic Diagnostic Devices
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Health care professionals may be asked about low-voltage electronic devices now being used to diagnose and/or treat a number of health problems. Most are galvanometers that measure skin resistance to an electric current. The FDA classifies “devices that use resistance measurements to diagnose and treat various diseases” as Class III devices that require FDA approval prior to marketing. None of the devices reviewed here has such approval.

ELECTROACUPUNCTURE ACCORDING TO VOLL (EAV) — Most EAV (also called electrodermal screening) diagnostic devices send a small electric current (about 0.8 volts) through a wire from the device to a brass cylinder that the patient holds in one hand. A second wire goes from the device to a probe that the operator applies to “acupuncture points” on the patient’s other hand or a foot. This completes a circuit, and the device registers the flow of current. A gauge or computer screen ... more      

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