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ABSTRACT

This study was conducted to determine whether or not a significant difference exists between the results of the electronically monitored nonstress test (NST) and the results of auscultation for a single fetal heart rate acceleration. Seventy-five NSTs were studied. They were performed on women greater that 34 weeks' gestation with a single fetus. Seventy NSTs were reactive, four were nonreactive, and one was unsatisfactory. Of the 70 reactive tests, 65 had reactive auscultated tests, three had nonreactive auscultated tests, and two were unsatisfactory because the fetus did not move. Of the four nonreactive NSTs, three had nonreactive auscultated tests. In one case, the auscultated test was reactive in a nonreactive NST. This was explained by a baseline fetal tachycardia, which the auscultator interpreted as an acceleration. McNamer's χ2 analysis of these findings indicated that results of the electronically monitored NST and the results of the auscultated test were the same. Thus, this method may be a reasonable, reliable alternative to the NST.