True about vacuum extraction of fetus:
indications fetal distress in second stage Maternal distress in second stage Prolonged second stage Deep transverse arrest and persistent occipito-posterior High vacuum for second twin (refer pgno: 447 textbook of obstetrics sheila 2 nd edition)
Can be used in nondilated cervix
Can be used in incompletely dilated cervix
Used in face presentation
Applied 3 cm posterior to anterior fontanel
Abnormal labor