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Nonstress testing
American Journal of Obstetrics and Gynecology
|September 15, 1980
Summary
The nonstress test is a valuable tool for assessing fetal well-being, showing a lower false negative rate than the contraction stress test. However, a nonreactive result necessitates further investigation due to a high false positive rate.
Area of Science:
- Obstetrics and Gynecology
- Fetal Monitoring
- Perinatal Medicine
Background:
- Fetal heart rate regulation is complex.
- Understanding fetal heart rate patterns is crucial for assessing fetal health.
- Nonstress testing is a common method for fetal surveillance.
Purpose of the Study:
- To review physiologic considerations in fetal heart rate regulation.
- To classify and illustrate types of fetal heart rate accelerations.
- To present data on nonstress tests (NSTs) and their interpretation.
Main Methods:
- Review of physiologic principles of fetal heart rate.
- Classification and illustration of fetal heart rate accelerations.
- Analysis of data from 509 patients undergoing 1,281 nonstress tests.
Main Results:
- The nonstress test demonstrated a lower false negative rate compared to the contraction stress test.
- A high false positive rate was observed for the nonstress test.
- Progressive loss of baseline variability and reduced accelerations indicate potential fetal compromise.
Conclusions:
- Nonstress testing is effective in identifying fetuses at risk.
- Nonreactive nonstress tests require further evaluation to rule out fetal compromise.
- Changes in fetal heart rate patterns, such as decreased variability and accelerations, are early indicators of fetal distress.