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Conditions affecting nonstress test results

W F Rayburn, M E Motley, F P Zuspan

    Obstetrics and Gynecology
    |April 1, 1982
    PubMed
    Summary
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    Nonreactive nonstress tests (NSTs) may be falsely indicated. Fetal activity and health during testing, not maternal factors, appear to influence NST results, impacting pregnancy monitoring.

    Area of Science:

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

    Background:

    • Nonreactive nonstress tests (NSTs) can cause clinical concern.
    • Understanding factors contributing to nonreactive NSTs is crucial for accurate fetal assessment.

    Purpose of the Study:

    • To investigate associations between various conditions and false nonreactive nonstress test (NST) results.
    • To identify factors that may falsely indicate fetal distress during NST.

    Main Methods:

    • Prospective investigation over 16 months.
    • Analysis of 534 satisfactory nonstress tests (NSTs) in 315 pregnancies.
    • Comparison of pregnancies with reactive versus nonreactive NST patterns.

    Main Results:

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    • 12% of satisfactory NSTs were nonreactive.
    • Maternal obesity, fasting, medications, time of day, or amniocentesis did not correlate with nonreactive results.
    • Recent cigarette smoking was infrequent but may contribute to false nonreactive results.
    • Fetal activity and fetal health during the test period appear to influence NST outcomes.

    Conclusions:

    • Factors like maternal obesity or medications do not commonly explain false nonreactive NSTs.
    • Fetal activity and health during the nonstress test are key determinants of NST results.
    • Further research into fetal-specific factors influencing NST reactivity is warranted.