Transcutaneous Electrical Nerve Stimulation for Pain Relief During the Active Phase of Labor

Primary Outcome Measures:

• Classification of Pain During Labor by Visual Analogue Scale [ Time Frame: 30 minutes ] [ Designated as safety issue: No ]

  To evaluate the Transcutaneous Electrical Nerve Stimulation as a resource for pain relief during the active phase of labor will be used the Visual Analogue Scale.

  Visual analogue scale (VAS): this scale, represented by a rule, the patient estimated pain on a scale of 100 mm (at one end labeled "no pain" associated with a score of 0 mm and at the other end "worst pain imagined" with a score 100 mm)

  
  

Secondary Outcome Measures:

• Evaluation of TENS During the Active Phase of Labor Over the Use of Analgesia [ Time Frame: 10 hours ] [ Designated as safety issue: No ]
  Consider whether the TENS therapy during the active phase of labor could defer request for analgesia use for pain relief for pregnant women. The cervical dilation indicates the value in centimeters (0-10) of cervical dilation. Assessed on admission and during labor by doctors (according to the routine of the institution), as recorded in medical records.
  
  
• Duration From Start of Labor Until Birth [ Time Frame: 10 hours ] [ Designated as safety issue: No ]
  The length of time of labor, specified number of minutes since the opening of the partograph (early labor) until the birth of the child.
  
  
• Number of Participants Who Were Satisfied With the Presence of a Professional/Physiotherapist During Labor. [ Time Frame: 10 hours ] [ Designated as safety issue: No ]
  Simple questionnaire (Questionnaire satisfaction of parturients with comparision with experience in this study) developed for this study with 3 items (yes, no and do not want to answer) to assess satisfaction of mothers in the intervention group and the control group regarding the presence of a professional during the period of study and experience in this work.
  
  

Pain in the work appears as a subjective experience of interaction, involving a wide individual influences physiological, psychosocial and environmental factors, representing a major clinical signs of this phase. Despite presenting an important biological function, is now well established the need for their relief, since its persistence is associated with detrimental effects for both mother and fetus. Among non-pharmacological resources available, the investigators highlight the massage therapy that has shown positive effects in relieving pain and promote comfort of the mother. The objective of this research is to evaluate the efficacy of Transcutaneous Electrical Nerve Stimulation (TENS) for pain relief in the early active phase of labor. The research will be of type randomized controlled trial, consisting of low-risk nulliparous pregnant women admitted to the Reference Center for Women's Health in Ribeirão Preto. Mothers will be divided into two groups (lumbosacral massage) and control (routine maternity) and will be evaluated before and after therapy, which corresponds to 30 minutes between 4-5 cm of cervical dilation. The evaluation will be performed by numerical category scale, location and Pain Diagram McGll Pain Questionnaire (short form). After the delivery will be a questionnaire of customer satisfaction. After collecting the data, the groups are statistically analyzed using the linear regression model with mixed effects (fixed and random), taking into account a value of p <0.05 for statistical significance of 5%.