adequate cervical dilation and descent of the fetal head are necessary but not sufficient conditions for vacuum extraction delivery. There are other factors that need to be considered, such as the position and size of the baby, the shape of the mother’s pelvis, and the availability of skilled personnel.

no evidence of fetal distress or demise is also a necessary but not sufficient condition for vacuum extraction delivery. Fetal distress or demise may indicate the need for an emergency cesarean section instead of an assisted vaginal delivery.

no contraindication such as prematurity, bleeding disorder, or hydrocephalus is also a necessary but not sufficient condition for vacuum extraction delivery. These conditions may increase the risk of complications or injuries for the mother or the baby during vacuum extraction.

All of the above are criteria for vacuum extraction delivery. Vacuum extraction is a method of assisted vaginal delivery that can help get the baby out when labor is stalled in the second stage. It involves applying a suction cup to the baby’s head and pulling while the mother pushes.