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Nonstress test and maternal position.

M M Abitbol, A G Monheit, J Poje

    Obstetrics and Gynecology
    |September 1, 1986
    PubMed
    Summary
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    Performing the nonstress test in the lateral decubitus position improves reactivity. This change in patient positioning can reduce false nonreactive nonstress test results, aiding accurate antepartum evaluation.

    Area of Science:

    • Obstetrics and Gynecology
    • Maternal-Fetal Medicine

    Background:

    • Nonstress testing is a common antepartum surveillance tool.
    • Nonreactive results can cause patient anxiety and lead to further interventions.

    Purpose of the Study:

    • To evaluate the impact of patient positioning on nonstress test (NST) reactivity.
    • To differentiate causes of nonreactive NSTs and reduce false positives.

    Main Methods:

    • Nonstress tests were performed on 487 primipara and multipara.
    • Tests initially conducted in the supine position were repeated in the lateral decubitus position if nonreactive.
    • Aortic compression was assessed based on patient position.

    Main Results:

    • 53 out of 487 patients had nonreactive NSTs in the supine position.

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  • 21 of these 53 patients had reactive NSTs in the lateral decubitus position.
  • Supine nonreactivity was linked to aortocaval compression in these 21 patients.

    • Conclusions:

    • Patient positioning significantly affects NST results.
    • The lateral decubitus position can mitigate false nonreactive NSTs caused by uterine aortocaval compression.
    • Implementing the lateral position can enhance the accuracy of antepartum fetal well-being assessments.