PROGNOSTIC COMPONENTS OF THE NONREACTIVE NONSTRESS TEST

  • 1 January 1980
    • journal article
    • research article
    • Vol. 56  (3) , 305-310
Abstract
Nonstress tests [2592] were performed on 862 human fetuses; 2239 (86.3%) had reactive and 353 (13.6%) had nonreactive results. Of these 862 fetuses, 842 delivered were available for further study. Of these 842 fetuses, 109 were delivered within 1 wk of a nonreactive tracing and 733 were delivered within 1 wk of a reactive tracing. A retrospective analysis was performed on 102 of the nonreactive tracings done within 1 wk of delivery to assess the significance of various components of the nonstress test on the subsequent stress test and perinatal outcome. No significant difference was observed in the number of fetal movements and total number of accelerations as compared to the subsequent stress test. Non-reactive tracings of the contraction stress test (CST)-positive group differed from those of the CST-negative group in number of accelerations over 15 beats/min (38 vs. 48%) (P < 0.05) and in the number of acclerations lasting longer than 20 s (20 vs. 50%) (P < 0.01). The number of nonreactive fetal movements per test (2.6 vs. 0.96) (P < 0.05) and the percentage of nonreactive fetal movements (33 vs. 15%) (P < .01) were different in both groups. The growth-retarded fetus in the nonreactive group did not differ in the number of fetal movements or total accelerations when compared to fetuses born appropriate for gestational age but the number of accelerations was more than 15 beats/min (26 vs. 50%) (P < 0.01) and the number of accelerations lasting 20 seconds (11 vs. 28%) (P < 0.01) did differ significantly.

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