Effectiveness of Low Power Laser in the Cicatricial Process and Pain Relief in Primiparous People With Spontaneous Perineal Laceration After Normal Delivery

In primiparous women with spontaneous perineal laceration, grade 1 and 2, during normal delivery submitted to the application of low power laser versus "sham" laser:

1. Describe the biological characteristics (age, weight, height, BMI), sociodemographic (marital status, race, years studied, family income, social occupational);
2. Describe the characteristics related to life habits (smoking, activity physical, pelvic physiotherapy during pregnancy, Pilates during pregnancy, yoga during pregnancy);
3. Describe the previous gynecological and obstetric characteristics (number of pregnancies, type of previous births, number of abortions, suture in childbirth current) and obstetric (prenatal consultations, number of prenatal consultations, gestational age, gestational weight gain, use of oxytocin, use of analgesia, blood flow guidance, position during the second period of childbirth, hours labor, instrumental delivery, birth weight, head circumference of the newborn, shoulder dystocia, perineal laceration, the severity of lacerations, laceration extension, postpartum perineal pain);
4. Compare the parameters of REEDA, such as redness, edema, bruising, secretion and approximation of the edges at each intervention and in the range of seven and 42 days after laser application;
5. Compare the frequency of perineal pain and genito-pelvic pain at each intervention and between seven and 42 days after laser application;
6. Compare the measurement of the extent of perineal laceration, using Peri-Rule, the each intervention and in the interval of seven and 42 days after the application of the laser.

Initially, the study will be carried out with 30 women (pilot study) for later the sample calculation will be carried out. A pilot study will be carried out, as, during the search in the database, no studies were found that address the use of low-level laser in spontaneous perineal lacerations, so that sample calculation was carried out.

Randomization for the intervention and control groups will be performed according to a list of random numbers drawn up for that purpose by an employee who does not was involved with data collection, to ensure confidentiality in the allocation. From this list, sealed and opaque envelopes will be prepared, numbered sequentially, with each number, according to the randomization table, corresponds to the patient's allocation to the intervention or control group.

For statistical analysis of the data, the domain statistical program will be used public Epi-info version 7, or higher versions. Tables will be distributed frequency distribution for categorical variables, calculating the mean and deviation standard of quantitative variables. Then, contingency tables will be used to determine the association of the independent variable (laser application) with the independent variables (REEDA scale, perineal pain, genito-pelvic pain). For determination of the strength of association will be calculated as a measure of the risk (RR) and its 95% confidence interval. All p values will be two-tailed and in all stages of the analysis will be considered a level of significance 5%.