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Related Experiment Videos

The startle test revisited.

Joseph M Miller1, Alison Rodriguez, Harvey A Gabert

  • 1Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, 1542 Tulane Avenue, New Orleans, LA 70112, USA.

Journal of Perinatology : Official Journal of the California Perinatal Association
|May 21, 2004
PubMed
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External physical stimulation effectively mimics the nonstress test (NST) in assessing fetal well-being. This ultrasound method accurately identifies fetuses with a reactive nonstress test, offering a comparable alternative.

Area of Science:

  • Perinatal medicine
  • Fetal monitoring
  • Diagnostic ultrasound

Background:

  • The nonstress test (NST) is a standard method for evaluating fetal well-being.
  • Accurate fetal heart rate assessment is crucial for prenatal care.

Purpose of the Study:

  • To compare fetal heart rate reactions to external physical stimulation with the nonstress test (NST).
  • To evaluate the efficacy of ultrasound-induced fetal stimulation as an alternative to NST.

Main Methods:

  • Prospective study evaluating fetal heart rate accelerations using two methods.
  • Standard nonstress test (NST) performed, with results blinded to ultrasonographer.
  • Ultrasound transducer used for external physical stimulation to elicit fetal movement and heart rate response.

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Main Results:

  • 194 patients underwent 235 studies.
  • A reactive NST correlated with an ultrasound startle response of ≥15 bpm (151/216 cases).
  • Nonreactive NSTs were associated with ultrasound responses ≤14 bpm (p<0.001), demonstrating high specificity and sensitivity (AUC=0.948).

Conclusions:

  • Fetal heart rate response to external stimulation identifies 67% of patients with a reactive NST.
  • Ultrasound-induced fetal stimulation shows high accuracy comparable to NST.
  • This method offers a potentially valuable alternative for fetal well-being assessment.