The preterm nonstress test

Effects of gestational age and length of study

Ramon A. Castillo, Lawrence D. Devoe, Martha Arthur, Nancy Searle, William Metheny, David A. Ruedrich

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The application of the nonstress test between 24 and 32 weeks' gestation has been limited by high rates of "false" nonreactivity in normal fetuses, by use of term criteria, and the lack of age-appropriate interpretative standards. To establish such standards, we studied 30 normal fetuses undergoing 90-minute fetal heart rate recordings at 2-week intervals from 24 to 32 weeks' gestational age. Using a specially programmed computer we quantified (1) baseline fetal heart rate, (2) incidence of 10- and 15-beat accelerations, and (3) incidence of fetal heart rate decelerations. With a criterion of three 10-beat accelerations per 30 minutes 91% of tests were reactive within 90 minutes. A criterion of three 10-beat acceleration per 30 minutes was associated with 100% reactivity within 60 minutes. Suitable interpretative criteria may be established for nonstress tests before 32 weeks' gestation by extending the testing time or by decreasing the minimum aplitude required of fetal heart rate accelerations.

Original languageEnglish (US)
Pages (from-to)172-175
Number of pages4
JournalAmerican Journal of Obstetrics and Gynecology
Volume160
Issue number1
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

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Fetal Heart Rate
Gestational Age
Fetus
Pregnancy
Deceleration
Incidence

All Science Journal Classification (ASJC) codes

  • Medicine(all)
  • Obstetrics and Gynecology

Cite this

The preterm nonstress test : Effects of gestational age and length of study. / Castillo, Ramon A.; Devoe, Lawrence D.; Arthur, Martha; Searle, Nancy; Metheny, William; Ruedrich, David A.

In: American Journal of Obstetrics and Gynecology, Vol. 160, No. 1, 01.01.1989, p. 172-175.

Research output: Contribution to journalArticle

Castillo, Ramon A. ; Devoe, Lawrence D. ; Arthur, Martha ; Searle, Nancy ; Metheny, William ; Ruedrich, David A. / The preterm nonstress test : Effects of gestational age and length of study. In: American Journal of Obstetrics and Gynecology. 1989 ; Vol. 160, No. 1. pp. 172-175.
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