“…11,12 The mean success rate for ECV is approximately 58%, but the rate ranges from 35% to 100%. [13][14][15][16][17][18] Determinants of ECV success include maternal factors (age, 19,20 parity, [19][20][21][22][23][24] weight, 19,25 cervical dilatation, 22 uterine tone, 20 amniotic fluid volume 23 ), fetal factors (gestational age, 19,24 fetal weight, 22 placentation and presentation, 19,[22][23][24][25] engagement of presenting part 26 ), and technique (use of tocolysis, [27][28][29] intravenous fluids, 30 skill and experience of the obstetrician, and real-time ultrasonography 31 ). Neuraxial blockade may also increase the success of ECV by promoting abdominal muscular relaxation; this reduces both patient discomfort and involuntary muscle tensing which may reduce the effectiveness of ECV efforts.…”