IntroductionHistorically, the use of episiotomy was common for primiparous women in order to prevent severe perineal trauma. Paradoxically, reviews indicate the opposite: episiotomy may actually contribute to severe perineal trauma rather than protect against it (1-4). Although current practice favours a reduction in episiotomies, perineal trauma rates remain high because of the increase in first and second degree tears (2,5,6). Prevalence rates of third and fourth degree perineal lacerations ranges widely from 0.3% to 6% or approximately 1.7% of all births (2.9% in primiparous). Most studies focus on the incidence and the risk factors of more severe perineal trauma including the anal sphincter (7-10). However, few studies have evaluated the incidence of perineal tears that do not affect the anal sphincter. Perineal tears are common following spontaneous vaginal deliveries and practically inevitable in forceps-assisted births (11). Even in mild tears, second degree perineal trauma deserves special consideration as it affects the muscular structure. The muscular damage classified as a second degree tear is equal to or worse than that which results from a routine episiotomy, if it affects the levator ani muscle. A published study on the correlation between episiotomy or perineal tears and pelvic disorders in women who had delivered vaginally 5 to 10 years earlier, concluded that perineal tear was a risk factor for pelvic floor dysfunction but that episiotomy was not (12). Only a small percentage of primiparous women will have an intact perineum after vaginal delivery. There is no data that analyzes the association between episiotomy and mild perineal trauma in primiparous women with spontaneous vaginal delivery. Knowing whether or not an association exists and being able to analyze the risk factors associated with mild perineal tears, would help us reach a better understanding of the appropriate use of episiotomy. The study aimed to estimate the incidence of different types of perineal tears [as classified by the Royal College of Obstetricians (13)] in a group of primiparous women with spontaneous vaginal delivery and to identify factors that could be associated with the presence of second degree perineal trauma.
Materials and MethodsThis study is a subset analysis of women who had spontaneous vaginal deliveries from an institutional review Abstract Objectives: To estimate the incidence of perineal trauma in primiparous women with spontaneous vaginal delivery and to identify the factors associated with second-degree lacerations. Materials and Methods: A subset analysis of women with spontaneous vaginal deliveries (n=489) from an institutional review board-approved parent study in healthy, nulliparous, continent pregnant women, attending the public health care system of Catalonia (northeast Spain). Primary outcome measure was perineal trauma according to the RCOG classification. For the bivariate analysis, the Student's t-test, ANOVA and the chi-squared test, or the corresponding non-parametric tests were used. Rat...