Gynaecology & Obstetrics General 7919efbf In instrumental vaginal delivery: A Full cervical dilatation is the only pre-requisite B Forceps are used in all cases of breech delivery C Forceps may be used if ventouse fails D Ventouse can not be used in rotational occipito-transverse/posterior delivery High-Yield Explanation In case of failed ventouse, forceps may be used. Ref: Textbook of Obstetrics By Dutta, 4th Edition, Pages 397, 398, 613-614