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Nonstress testing and perinatal outcome

W Rayburn, J Greene, M Donaldson

    The Journal of Reproductive Medicine
    |May 1, 1980
    PubMed
    Summary
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    A reactive nonstress test (NST) indicates a low risk of fetal jeopardy. Repeating a reactive NST weekly is safe for high-risk pregnancies, showing improved perinatal outcomes compared to nonreactive tests or no testing.

    Area of Science:

    • Obstetrics and Gynecology
    • Fetal Medicine
    • Maternal-Fetal Medicine

    Background:

    • The clinical utility of nonstress testing (NST) for fetal well-being assessment remains debated.
    • High-risk pregnancies require reliable methods to monitor fetal health before delivery.

    Purpose of the Study:

    • To evaluate the association between nonstress test (NST) results and perinatal outcomes in high-risk pregnancies.
    • To determine the predictive value of reactive NST for fetal jeopardy.

    Main Methods:

    • Retrospective review of 561 high-risk patients undergoing NST within one week of delivery.
    • Analysis of fetal heart rate tracings for reactive criteria (≥2 accelerations in 20 min).
    • Comparison of perinatal mortality and morbidity between reactive NST, nonreactive NST, and no-testing groups.

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    Main Results:

    • Reactive NST results were associated with significantly lower perinatal mortality (1/509) compared to nonreactive NST (2/22) or no testing (20/1000).
    • Perinatal jeopardy incidence was significantly lower in pregnancies with reactive NST (4%) versus nonreactive NST (36%) or no testing (13%).
    • Morbidity in reactive NST group often occurred intrapartum, with no single predominant cause identified.

    Conclusions:

    • A reactive NST is a reliable indicator of low fetal risk and can be safely repeated weekly.
    • Reactive NSTs demonstrate significant value in predicting favorable perinatal outcomes for high-risk pregnancies.
    • The study supports the continued use of NST as a key tool in antepartum fetal surveillance.