Nonlinear analysis of fetal heart rate dynamics in fetuses compromised by asymptomatic partial placental abruption
- Authors
- Choi, Won-Young; Hoh, Jeong-Kyu
- Issue Date
- Dec-2015
- Publisher
- W B SAUNDERS CO LTD
- Keywords
- Approximate entropy; Correlation dimension; Fetal heart rate; Nonlinear dynamic indices; Partial placental abruption; Sample entropy; Short-term and long-term scaling exponents
- Citation
- PLACENTA, v.36, no.12, pp.1474 - 1479
- Indexed
- SCIE
SCOPUS
- Journal Title
- PLACENTA
- Volume
- 36
- Number
- 12
- Start Page
- 1474
- End Page
- 1479
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155724
- DOI
- 10.1016/j.placenta.2015.10.002
- ISSN
- 0143-4004
- Abstract
- Introduction: We analyzed fetal heart rate (FHR) parameters, dynamics, and outcomes in pregnancies with asymptomatic partial placental abruption (PPA) compared with those in normal pregnancies. Methods: We examined nonstress test (NST) data acquired from 2003 to 2012 at our institution. Normal pregnancies (N = 170) and PPA cases (N = 17) were matched for gestational age, fetal sex, and mean FHR. NSTs were performed at 33-42 weeks of gestation. FHR parameters obtained from the NST and perinatal outcomes were analyzed using linear methods. Nonlinear indices, including approximate entropy (ApEn), sample entropy (SampEn), short-term and long-term scaling exponents (alpha(1) and alpha(2)), and correlation dimension (CD), were used to interpret FHR dynamics and system complexity. The area under a receiver operating characteristic curve (AUC) was used to evaluate the nonlinear indices. Results: There were no significant differences in general characteristics and FHR parameters between the PPA and control groups. However, gestational age at delivery, birth weight, 5-min Apgar scores, ApEn, SampEn, and CD were significantly lower in the PPA group than in the control group (P < 0.05). The long-term scaling exponent (alpha(2)) and crossover index (alpha(2)/alpha(1)) of the PPA fetuses were significantly higher than those of the controls (P < 0.01). A multiple regression model showed better performance in predicting PPA (AUC, 0.92; sensitivity 82.35%; specificity, 94.12%). Discussion: Nonlinear dynamic indices of FHR in asymptomatic PPA were qualitatively different from those in normal pregnancies, whereas the conventional FHR parameters were not significantly different.
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