Analgesic Efficacy of Transcutaneous Electrical Nerve Stimulation (TENS) Versus Placebo During the First Stage of Labor

TENS is a non-pharmacological alternative for pain control during labor. Although it's a method that has been used for decades, there is not enough evidence on its efficacy, so it's considered ineffective in the Spanish and British guidelines of clinical practice. The present study seeks to verify the analgesic efficacy of TENS by applying the electrodes in the spinal nerve roots associated with labor pain and using conventional TENS with parameters that, according to the evidence, may be effective for this application.