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J Adv Nurs. 2000 Feb;31(2):410-7.

Exploring the risks associated with induction of labour: a retrospective study using the NIMATS database. Northern Ireland Maternity System.

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Jubilee Maternity Hospital, BCH HPSS Trust, Lisburn Rd, Belfast BT9 7AB, Northern Ireland.


Induction of labour is a valuable obstetric procedure, providing obstetricians with the means to intervene should the health of the fetus be in jeopardy. Currently the most common reason for induction of labour is prolonged pregnancy, as obstetricians and midwives are concerned about the risks of postmaturity such as stillbirth, intrapartum asphyxia and birth trauma which are often associated with prolonged pregnancy (Lagrew & Freeman 1986). A retrospective comparative study was carried out in a large maternity unit to identify whether or not there was clinical evidence to support a policy of elective induction for post-term pregnancy. Three years' data were extracted from the Northern Ireland Maternity System (NIMATS) by writing new queries to the system. These data on 3262 women who delivered during 1994-96 were analysed to compare the outcomes for women who were induced with women who delivered spontaneously. Although the findings from the study in many instances failed to demonstrate statistical significance between the groups they did however, have important clinical significance. For example, those women who were induced had a 5% higher rate of caesarean section, 17% higher rate of epidural analgesia and on average a greater estimated blood loss. Statistical significance was evident when the apgar scores of the infants were compared; those induced had lower Apgars at 1 minute (7. 78 in the induced group compared to 7.9 in the spontaneous group [P < 0.01]) and at 5 min (8.99 in the induced group compared to 9.05 in the spontaneous group [P < 0.02]).

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