Use of labor analgesia in trials of labor after previous cesarean section: A nationwide register-based analysis in Finland

The literature concerning the overall use of labor analgesia among women with trials of labor after cesarean section (TOLAC) is lacking. The primary aim of this study is to report the rate of different labor analgesia methods among women with TOLAC. The secondary aim was to compare the use of labor analgesia between women with the first TOLAC and control group consisting of nulliparous women.Data from the National Medical Birth Register was used to evaluate the usage of labor analgesia in TOLACs. The use of labor analgesia in the first TOLAC is compared to the pregnancies of nulliparous women. The analgesia methods were stratified into neuraxial analgesia, pudendal, paracervical, nitrous oxide, other medical, other non-medical, and no analgesia. These are analyzed as categorized dichotomy (yes or no) variables.A total of 38 596 TOLACs as second pregnancy of the mother was found during our study period. The control group consisted of a total of 327 464 pregnancies of nulliparous women. Epidural analgesia (61.6% vs 67.1%), nitrous oxide (56.1% vs 62.0%), and non-medical analgesia (30.1% vs 35.0%) were less consumed among women with TOLAC. The rate of spinal analgesia was higher among women with TOLAC (10.1% vs 7.6%) when compared to the control group. However, when only vaginal deliveries were included, the rate of labor analgesia increased especially in the TOLAC group.The main finding of this study is that women with TOLAC had a generally lower rate of labor analgesia. However, the rate of spinal analgesia was higher among women with TOLAC when compared to the control group, however. The results of this study inform midwives, obstetricians, and anesthesiologists on current practices and how to improve the analgetic treatment in TOLAC.