586: Do the “right” candidates for vaginal birth after cesarean delivery choose a trial of labor?

Abstract

CD¼>1 n¼15. Statistical analysis was performed using T-Test Assuming Unequal Variance. RESULTS: The results obtained for the different contractile parameters, for the 3 groups, are shown in Table 1. 592 tissue samples were analysed from 74 women. The only significant difference (Table 2) in contractile parameters found was in the frequency of contractions, with a lower frequency of contractions in the CD¼1 group compared to CD¼0 and CD¼>1 groups (p¼6.36E-06 and p¼0.000135 respectively). CONCLUSION: These data indicate that there is no significant difference in the general biological characteristics of human uterine contractions in vitro, in women who have had one, or greater that one previous CD, in comparison to women who have had none. The only notable feature is that the frequency of contractions was greater in the sub-group of women who had one previous CD. These findings indicate that factors other than the functional contractility of uterine tissue, may be responsible for the increased CD rate observed among women undergoing VBAC.References 1. Crankshaw DJ, O'Brien YM, Crosby DA, Morrison JJ. Maternal Age and Contractility of Human Myometrium in Pregnancy. Reprod Sci.