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Computerized cardiotocography: predictive value of instant variability
Author(s) -
Char Sang Choon,
Yamasaki A. A.,
Toma O. T.
Publication year - 2001
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.2001.abs27-28.x
Subject(s) - cardiotocography , medicine , fetus , gestation , fetal monitoring , predictive value , obstetrics , pregnancy , gynecology , genetics , biology
Computerized cardiotocography differs from classic method in measurement of instant variability, also named short‐term variation (STV) which is an important parameter of evaluation of fetal condition. While classic cardiotocography considers an active fetus when in the presence of two transitory accelerations (TA), in computerized method, value of STV is the most important parameter and it must be higher than 4 ms. Objective: Correlation between STV and TA. Methods: Two hundred and forty traces of computerized cardiotocography were analyzed (SYS 8002), in normal pregnant, between 30 and 36 weeks of gestation. They were divided into two groups: group I ( n = 200) represented by pregnant whose exam did not show any TA but STV > 4 ms after 10 min; group II ( n = 40) represented by pregnant with no TA and STV < 4 ms after 10 min. In all cases traces were continued until presence of TA, and the longest trace was 60 min of duration. Results: In group I, all cases showed TA while in group II in 60% cases initial STV < 4 ms have become more than 4 ms and with presence of TA, showing fetal in good conditions. In the other hand, in 40% cases even after keeping trace until complete 60 min there were not changes in STV or presence of TA. Conclusion: Fetuses with STV > 4 ms are related to active fetuses (presence of TA) and the ones with STV < 4 ms does ever not mean altered result as when prolonging trace until 60 min, 60% of these fetuses become active.