Relationship of BMI to Success of Vaginal Delivery in Women Attempting Trial of Labour after Cesarean Delivery

Background: The cesarean section rate is on a rise in industrialized countries with rates in the United States reachinga level of 32.3% in 2008,highest ever in history. To reduce the rate of cesarean delivery, most pregnant women with a single previous low transverse cesarean delivery be counselled about VBAC and be offered a trial of labor in lines with recommendations of American College of Obstetricians and Gynaecologists(ACOG). Obesity increases the likelihood of cesarean delivery in all circumstances, so for all the more reason it contributes towards failed VBAC. Aim: To determine frequency of successful VBAC based on BMI in patients with bishop score 5 or above. Study design & duration: Descriptive case series, Six months from 26th April 2012 to 25th October 2012 Study setting: Department of Obstetrics and Gynecology Benazir Bhutto Hospital, Rawalpindi. Results: Accordingly to BMI distribution of the patients; Group A (BMI<19.8) with total number of patients 35, reveals mean and sd 19.6 +/- 0.243 with success rate of VBAC 91.43%. In Group B (BMI 19.8-26) with total number of patients 40, reveals mean and sd 22.48 +/- 1.96 with success rate of VBAC 87.5%. Group C (BMI 26.1-29) with total number of patients 30, reveals mean and sd 27.25 +/- 0.882 with success rate of VBAC 80.0%.Group D (BMI>29) with total number of patients 30, reveals mean and sd 29.84 +/- 0.4014 with success rate of VBAC 80.0%. P value was 0.05 which is statistically significant. Conclusion: In view of the results of the study it is concluded that ascompared to international statics, relatively high success rates of VBACobtained even with high BMI.