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  • Title: Is there an incremental rise in the risk of obstetric intervention with increasing maternal age?
    Author: Rosenthal AN, Paterson-Brown S.
    Journal: Br J Obstet Gynaecol; 1998 Oct; 105(10):1064-9. PubMed ID: 9800928.
    Abstract:
    OBJECTIVE: To determine whether increasing maternal age increases the risk of operative delivery and to investigate whether such a trend is due to fetal or maternal factors. DESIGN ANALYSIS: of prospectively collected data on a maternity unit database. SETTING: A postgraduate teaching hospital. POPULATION: 6410 nulliparous women with singleton cephalic pregnancies delivering at term (3742 weeks of gestation) between 1 January 92 and 31 December 95. MAIN OUTCOME MEASURES: Mode of delivery, rates of prelabour caesarean section, induction of labour and epidural usage. RESULTS: There was a positive, highly significant association between increasing maternal age and obstetric intervention. Prelabour (P < 0.001) and emergency (P < 0.001) caesarean section, instrumental vaginal delivery (spontaneous labour P < 0001; induced labour P = 0.001), induction of labour (P < 0.001) and epidural usage in spontaneous labour (P = 0.005) all increased with increasing age. In the second stage of labour fetal distress and failure to advance, requiring instrumental delivery, were both more likely with increasing maternal age (in both P < 0.001). Epidural usage in induced labour and the incidence of small for gestational age newborns did not increase with increasing maternal age (P = 0.68 and P = 0.50, respectively). CONCLUSIONS: This study demonstrates that increasing maternal age is associated with an incremental increase in obstetric intervention. Previous studies have demonstrated a significant effect in women older than 35 years of age, but these data show changes on a continuum from teenage years. This finding may reflect a progressive, age-related deterioration in myometrial function.
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