title: Developmental characteristics in sustained fetal tachycardia in 30 to 41 weeks of gestation.
abstract: The aim of the present study is to reveal gestational age-related changes in sustained foetal tachycardia (SFT). 24 h fetal heart rate (FHR) recordings were made on 102 normal pregnant women in 30-41 weeks of gestation. SFT was defined as an increase for 20 or more beats per minute from the FHR-baseline persisting for more than 20 min. In the results, SFTs in 38-39 weeks started during night-time (1900-0700) more frequently than during day-time (0700-1900) (P < 0.01, by chi-square test). The rate and duration were 0% and 0 min in 30-31 weeks of gestation, and increased to 85% and 114 min in 40-41 weeks, respectively. Two critical points were detected by a piecewise linear regression analysis: in the rate between 34-35 weeks and 36-37 weeks, and in the duration between 38-39 to 40-41 weeks. We conclude that gestational age-related changes in SFT depend on the developmental stages.
authors.affiliation: Department of Obstetrics and Gynecology, Saga Medical School, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Shono
authors.forename: M
authors.initials: M
authors.lastname: Muro
authors.forename: M
authors.initials: M
authors.lastname: Shono
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
authors.forename: A
authors.initials: A
authors.lastname: Uchiyama
authors.forename: H
authors.initials: H
authors.lastname: Sugimori
mesh_terms: D001519:Behavior; D005314:Embryonic and Fetal Development; D005260:Female; D005865:Gestational Age; D006340:Heart Rate, Fetal; D006801:Humans; D016014:Linear Models; D011247:Pregnancy