caa a22 4500 388059079 CHVBK 20180307125115.0 cr unu---uuuuu 161130e19980601xx s 000 0 eng 10.1375/twin.1.3.138 doi S1369052300000325 pii (NATIONALLICENCE)cambridge-10.1375/twin.1.3.138 Kurzel Richard B. Department of Obstetrics and Gynecology, University of California, Los Angeles, USA. Twin entanglement revisited [Elektronische Daten] [Richard B Kurzel] A fear of interlocking twins is one factor that has led to a high Cesarean section (C/S) rate in breech (A)/vertex (B) (Bra/Vtxb) twins. We sought to estimate the frequency of occurrence of twin entanglement, and of interlocking Bra/Vtxb twins in vaginal deliveries. 541 twins and 48 195 deliveries were retrospectively studied for the period 1987-1995. The incidence of Bra/Vtxb deliveries was noted, and the number of deliveries marked by interlocking and collision of fetuses. The mode of delivery, reason for C/S, and sources of perinatal mortality were noted. Only 43 deliveries were Bra/Vtxb (7.9% of all twins) and of these only 14 (32.6%) were delivered vaginally. One case of interlocking (2.3% of all Bra/Vtxb pairs) and five cases of collision of twins (ie competition for entry into the pelvic inlet with obstruction) were noted. All cases mentioned were delivered by C/S. No perinatal mortality resulted from these cases. In recent years the trend has been for greater use of C/S and ultrasound in managing twin deliveries. In this study 67.4% of Bra/Vtxb twins were delivered by C/S. Although there are fewer vaginal deliveries of these twins and the rate for interlocking (2.3%; 95% CI: 0.06-12.3%) for the whole group has remained about the same, we found the rate in those twins allowed vaginal delivery was 6.7% (95% CI: 0.2-31.9%). The presentation at greatest risk for entanglement was found to be Bra/Vtxb. Copyright © Cambridge University Press 1998 twin entanglement nationallicence twin collision nationallicence twin interlocking nationallicence Twin Research Cambridge University Press 1/3(1998-06-01), 138-141 1369-0523 1:3<138 1998 1 THG https://doi.org/10.1375/twin.1.3.138 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1375/twin.1.3.138 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kurzel Richard B. Department of Obstetrics and Gynecology, University of California, Los Angeles, USA NATIONALLICENCE 773 0- Twin Research Cambridge University Press 1/3(1998-06-01), 138-141 1369-0523 1:3<138 1998 1 THG CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge