MATERNAL AND FETAL OUTCOMES IN PATIENTS WITH PREVIOUS CAESAREAN SECTION UNDERGOING TRIAL OF VAGINAL BIRTH

Abstract

Background: Vaginal birth after cesarean section (VBAC) is one of the strategies developed to control the rising rate of cesarean sections (CSs). It is a trial of vaginal delivery in selected cases of a previous CS in a well-equipped hospital. In 1916, Cragin popularized the dictum, once a caesarean section, always a caesarean section. That was the era of the classical CS. In the present era of lower segment caesarean section (LSCS), cesarean-related morbidity and mortality are significantly reduced. The dictum now is once a caesarean section, always an institutional delivery in a well-equipped hospital. The reasons which led to the reversal of the old dictum are based upon the newer concepts of the assessment of scar integrity, fetal well-being, and improved facilities of emergency Cesarean Section. Successful vaginal birth after cesarean section is more comfortable than repeat emergency or elective cesarean section. Antenatal examinations are important in selection for trial of labor, while birth management can be difficult when the patients present at emergency condition. But there is an increased chance of vaginal birth with advanced cervical dilation.Nevertheless, a previous CS does cast a shadow over the outcome of future pregnancies. With present techniques and skill, the incidence of cesarean scar rupture in subsequent pregnancies is very low. The strength of the uterine scar and its capacity to withstand the stress of subsequent pregnancy and labor cannot be completely assessed or guaranteed in advance. These cases require the assessment and supervision of a senior obstetrician during labor. Hence, the present study is undertaken to assess the success and safety of VBAC in selected cases of one previous LSCS and to evaluate the maternal and fetal outcome in these cases. Methods:This prospective observational study was conducted over a period of 18 months from 1st August 2019 to 28th February 2021 at the department of obstetrics and Gynaecology, tertiary care hospital Pune, Maharashtra, India. After achieving ethic committee approval, informed consent of patients enrolled for the study taken, a thorough history and physical examination was done as per proforma. Cases were evaluated thoroughly to collect maternal age, gestational age at admission, association of success rate of VBAC and Parity, Mode of delivery, whether instrumentation was required, indication of previous LSCS, indication of caesarean section in repeat emergency caesarean section, history of prior vaginal delivery, interpregnancy interval. Maternal and fetal outcomes in both successful VBAC and emergency caesarean section were observed.Data collected in structured pro-forma, entered in Microsoft Office Excel format, and statistical analysis was performed using SPSS software. The data so collected was presented with graphical representation. Results: Out of 65 patients undergoing TOLAC, a total of 51 patients had successful vaginal birth and for 14 patients emergency caesarean section was needed. Therefore, the success rate of VBAC in this study in 78%. The most common indication of failed TOLAC was fetal distress. Factors affecting success of TOLAC seen in the study were inter-pregnancy interval, fetal weight and previous caesarean section done for non-recurrent indications. No significant fetal or maternal morbidity was observed in this study. There was no fetal and maternal mortality. Conclusion:Trial of labor after one caesarean section should be undertaken in selected patients in well-equipped hospitals where facilities to deal with emergencies are available.Despite the risks, trial of labor after caesarean remains safer option for many patients as there are fewer complications with less maternal morbidity and will lead to a successful outcome in a high percentage of cases.