the introduction of pulses of low-voltage electricity into tissue for the relief of pain. It is effected by means of a small portable battery-operated unit with leads connected to electrodes attached to the skin; the strength and frequency of the pulses, which prevent the passage of pain impulses to the brain, can be adjusted by the patient. TENS is used mainly for the relief of rheumatic pain; as a method of producing pain relief in labour, it is less frequently used than epidural anaesthesia, which has a much wider application for pain relief in obstetrics.
Medical dictionary. 2011.