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A comparison of two time intervals for the ausculated acceleration test.
L L Paine1, L R Zanardi, T R Johnson
1Department of Maternal and Child Health at the Boston University School of Public Health, MA 02118-2526, USA.
Journal of Midwifery & Women'S Health
|May 24, 2001
Summary
The 6-minute auscultated acceleration test (AAT) is clinically preferred over the 10-minute version for antenatal screening. Both AAT durations showed minimal differences in predicting perinatal outcomes, making the shorter test more efficient.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Fetal Assessment
Background:
- The auscultated acceleration test (AAT) was developed as an inexpensive, low-technology antenatal screening method.
- Recent efforts focus on optimizing AAT procedures for effective clinical use.
- This study evaluates the screening test validity of two AAT time intervals.
Purpose of the Study:
- To determine the screening test validity performance of 6-minute (AAT6) and 10-minute (AAT10) auscultated acceleration tests.
- To compare the predictive accuracy of AAT6 and AAT10 for perinatal outcomes.
Main Methods:
- Two auscultated acceleration tests (AAT6 and AAT10) were performed simultaneously on 205 high-risk pregnant women.
- Screening test validity measures were calculated for each AAT duration.
- Nonstress tests (NST) findings were included for comparative analysis.
Main Results:
- AAT6 demonstrated higher specificity than AAT10, with non-significant differences in sensitivity for most perinatal outcomes.
- Both AAT6 and AAT10 showed similar predictive value for fetal distress and neonatal morbidity.
- Both AAT durations exhibited better sensitivity compared to NST.
Conclusions:
- The 6-minute AAT is clinically preferred due to minimal differences in predictive validity compared to the 10-minute AAT, with less required labor.
- The study suggests the 6-minute AAT is a practical option for antenatal screening.
- Further research is recommended for the continued development of AAT as a worldwide low-technology fetal assessment tool.
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