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Related Experiment Videos

Continuing experience with the fetal acoustic stimulation test.

C V Smith1, J P Phelan, H N Nguyen

  • 1Department of Obstetrics and Gynecology, University of Southern California School of Medicine, Los Angeles.

The Journal of Reproductive Medicine
|April 1, 1988
PubMed
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Adding acoustic stimulation to antepartum fetal heart rate testing, specifically the nonstress test (NST), reduces nonreactive results. This enhancement improves fetal well-being assessment in high-risk pregnancies without compromising test reliability.

Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Perinatal Assessment

Background:

  • Antepartum fetal heart rate testing is crucial for assessing fetal well-being in high-risk pregnancies.
  • The nonstress test (NST) is a common method, but a high rate of nonreactive results can be problematic.
  • Transabdominal acoustic stimulation has emerged as an adjunctive tool to improve NST outcomes.

Purpose of the Study:

  • To evaluate the effectiveness and safety of transabdominal acoustic stimulation as an adjunct to antepartum fetal heart rate testing.
  • To assess the impact of acoustic stimulation on nonreactive nonstress tests (NSTs) and fetal mortality rates.
  • To compare the predictive reliability and outcomes of acoustic stimulation testing with traditional NSTs.

Main Methods:

Related Experiment Videos

  • A prospective study involving 1,503 women and 3,935 antepartum fetal heart rate tests using transabdominal acoustic stimulation.
  • Pooling data with previous institutional reports for an aggregate analysis of 7,763 tests.
  • Comparing fetal death rates within seven days of a reactive test between fetuses receiving acoustic stimulation and those with spontaneous reactivity.

    • Main Results:

    • A reactive test result was achieved in 93% of cases with acoustic stimulation.
    • The fetal death rate within seven days of a reactive test was 1.3/1,000 in the current study.
    • In the aggregate experience, the fetal death rate was 1.9/1,000 with acoustic stimulation versus 1.6/1,000 with spontaneous reactivity.

    Conclusions:

    • Adjunctive transabdominal acoustic stimulation is effective in reducing nonreactive nonstress tests (NSTs).
    • Fetal acoustic stimulation testing appears to offer advantages over traditional NSTs, with comparable predictive values for normal tests.
    • The incidence of fetal death within seven days of a reactive test is not adversely affected by the use of acoustic stimulation.