Determination of fetal heart rate reactivity from a single 20-min window of non-stress testing in compromised fetuses
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Young-Sun Park
Abstract
Aims: To shorten the analysis time needed for non-stress testing (NST) without decreasing efficacy in compromised fetuses.
Methods: We selected 80 cases with a 5-min Apgar score <7 as a study group and 259 cases with a 5-min Apgar score ≥9 as a control group. We applied four different criteria (A, B, C, and D) to each study and control group for the first 20-min window of NST data to evaluate reactivity. Criteria A, B, and C consisted of conventional reactivity criteria according to amplitude (15 or 10 beats per minute), duration (15 or 10 s) and weeks of gestation (≤31, ≥32), and criteria D combined criteria C with approximate entropy (ApEn).
Results: The sensitivity of criteria D (91.25%) was greater than the other three criteria (P<0.0001). The specificities of criteria C (96.14%) and D (99.23%) were also higher than criteria A and B (P<0.0001). The positive and negative predictive value of criteria D were better than that of criteria C (97.33 vs. 83.87, P=0.0066) and (97.35 vs. 89.89, P=0.0004), respectively.
Conclusion: Adding ApEn to the conventional criteria for reactivity shortened NST analysis time without decreasing efficacy, facilitating a decision of reactivity within a single 20-min NST window.
©2009 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Original articles – Obstetrics
- The effect of bilateral pelvic neurectomy on uterine and abdominal electrical and pressure activity, as measured by telemetry in conscious, unrestrained pregnant rats
- Parental mental representations during late pregnancy and early parenthood following assisted reproductive technology
- Does progesterone inhibit bacteria-stimulated interleukin-8 production by lower genital tract epithelial cells?
- Flowcytometric assessment of fetomaternal hemorrhage during external cephalic version at term
- Progesterone – induced blocking factor (PIBF) and Th1/Th2 cytokine in women with threatened spontaneous abortion
- Coagulation and fibrinolysis related cytokine imbalance in preeclampsia: the role of placental trophoblasts
- Maternal serum adiponectin multimers in preeclampsia
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- Changes in symphysis pubis width during labor
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- Original articles – Fetus
- Embryo vascularization by three-dimensional power Doppler ultrasonography at 7–10 weeks of pregnancy
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- Letters to the Editor
- Obstetrical chondro-epiphyseal separation of the distal humerus: a case report and review of literature
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- Severe neonatal hyporegenerative anemia due to anti-Vw (anti-MNS9) alloantibody
- A new device to facilitate the chorion villus sampling
- Correct definition of pentalogy of Cantrell
- Congress Calender
- Congress Calendar
