Department of Obstetrics and Gynecology, Hudiksvall Hospital, Hudiksvall, Sweden.
The Norwegian Continence and Pelvic Floor Center, University Hospital of North Norway, Tromsø, Norway.
J Matern Fetal Neonatal Med. 2022 Dec;35(25):8887-8891. doi: 10.1080/14767058.2021.2005574. Epub 2021 Nov 22.
The primary aim of this study was to observe the change in obstetric anal sphincter tear rates in instrumental deliveries during one decade. Secondly, the changes in non-instrumental deliveries were followed.
Data from all deliveries at Hudiksvall Hospital, Sweden 2010-2011 and 2016-2017 were collected. The change of OASIS rate during instrumental deliveries was the most important. Statistical significances were calculated by using chi-square test, test for relative proportions, and Students t-test, where appropriate.
The total incidence of OASIS decreased significantly (from 2.54% to 0.73%, < .001). Even the OASIS rate in instrumental deliveries decreased substantially from 15.1% to 3.0% ( = .002) but the decrease was statistically insignificant in spontaneous deliveries (from 1.22% to 0.60%, = .065).
Based on the results of our study the manual protection of the perineum reduces the risk of OASIS in instrumental delivery significantly.
本研究的主要目的是观察十年间器械分娩中产科肛门括约肌撕裂率的变化。其次，还观察了非器械分娩中的变化。
收集了瑞典 Hudiksvall 医院 2010-2011 年和 2016-2017 年所有分娩的数据。器械分娩中 OASIS 发生率的变化是最重要的。使用卡方检验、相对比例检验和学生 t 检验（在适当的情况下）来计算统计学显著性。
OASIS 的总发生率显著下降（从 2.54%降至 0.73%，<0.001）。即使器械分娩中的 OASIS 发生率也从 15.1%显著下降至 3.0%（=0.002），但在自然分娩中下降无统计学意义（从 1.22%降至 0.60%，=0.065）。
根据我们的研究结果，会阴的手法保护可显著降低器械分娩中 OASIS 的风险。
