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Third‐ or Fourth‐Degree Intrapartum Anal Sphincter Tears Are Associated With Levator Ani Avulsion in Primiparas
Author(s) -
Valsky Dan V.,
Cohen Sarah M.,
Lipschuetz Michal,
Hochner-Celnikier Drorith,
Daum Hagit,
Yagel Itai,
Yagel Simcha
Publication year - 2016
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/ultra.15.04032
Subject(s) - medicine , tears , episiotomy , perineum , external anal sphincter , anal sphincter , anal canal , levator ani , pudendal nerve , odds ratio , gestational age , vaginal delivery , sphincter , obstetrics , pelvic floor , surgery , gynecology , pregnancy , rectum , genetics , biology
Objectives We evaluated primiparous women with clinically diagnosed third‐ and fourth‐degree and anal sphincter tears, to evaluate the rate of levator ani muscle injury compared to primiparous women without sphincter tears. Methods Primiparous women delivering in our maternity ward with intrapartum diagnoses of third‐ or fourth‐degree anal sphincter tears, repaired by the overlapping technique, were recruited to undergo 3‐dimensional transperineal sonography of the pelvic floor anatomy, including the anterior and posterior compartments. Primiparas with uncomplicated vaginal deliveries were recruited as a comparison group. Patient files were examined, and maternal backgrounds and delivery and neonatal details were extracted for all patients. Results Ninety‐four women with tears were recruited to the study group, and 464 women with normal vaginal deliveries constituted the comparison group. The groups differed significantly in the rates of levator ani defects: 38 of 94 women (40.4%) in the study group versus 75 of 464 (16.2%) in the comparison group ( P < .001; odds ratio, 3.53; 95% confidence interval, 2.18–5.7). Neonatal head circumference differed significantly between the study and comparison groups: (mean ± SD, 34.5 ± 1.3 cm in the study group versus 33.9 ± 1.3 cm in the comparison group; P = .005), as did birth weight (3322 ± 430 g in the study group versus 3169 ± 458 g in the comparison group; P = .007). The groups did not differ in maternal age, gestational age at delivery, length of second stage of labor, and rates of epidural anesthesia, episiotomy, and vacuum extraction. Conclusions Third‐ and fourth‐degree intrapartum sphincter tears are associated with levator ani avulsion. Knowledge of complex pelvic floor damage may allow for prompt referral to secondary preventive measures for pelvic floor disorders.