title: Diurnal rhythms in fetal heart rate baseline and sustained fetal tachycardia in twin pregnancy.
abstract: OBJECTIVE
  To elucidate the synchronization of phases of diurnal rhythms in fetal heart rate (FHR) baseline between twin fetuses and the occurrence of sustained fetal tachycardia.
  
  
  METHODS
  FHR was simultaneously recorded in twins for 24 h in 7 monochorionic diamniotic (MD) and 8 dichorionic diamniotic (DD) twin pregnancies at 35 to 38 weeks of gestation. The diurnal rhythms of the hourly mean FHR baseline were tested in each fetus, and the time of occurrence of sustained fetal tachycardia was compared between twins. The correlation coefficients and phase lags of diurnal rhythms between the hourly mean FHR baselines of twins were calculated in each case.
  
  
  RESULTS
  There were significant diurnal rhythms in the hourly mean FHR baselines of all twin fetuses (p<0.01). The patterns of diurnal rhythms were similar for each pair of twins, with the exception of the periods of sustained fetal tachycardia. Sustained fetal tachycardia was not coincident between twins. Analysis in which the periods of sustained fetal tachycardia were excluded demonstrated a significant correlation between the hourly mean FHR baselines of twins in all cases (p<0.01). In the case of DD twins, the phase lag between twins was 0; however, phase lags were observed in 4 cases of MD twins.
  
  
  CONCLUSIONS
  The results of this study revealed that the diurnal rhythms in the FHR baseline correlated well between twins, and that the occurrences of sustained fetal tachycardia were completely independent.
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Medicine, Saga University, 5-1-1, Nabeshima, Saga, 849-850, Japan.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Maeda
authors.forename: Masami
authors.initials: M
authors.lastname: Muro
authors.forename: Mayumi
authors.initials: M
authors.lastname: Shono
authors.forename: Hideaki
authors.initials: H
authors.lastname: Shono
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Iwasaka
mesh_terms: D000328:Adult; D002823:Chorion / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D004200:Diseases in Twins / Q000209:etiology; D005260:Female; D005315:Fetal Diseases / Q000209:etiology; D005330:Fetofetal Transfusion / Q000150:complications*; D006340:Heart Rate, Fetal / Q000502:physiology*; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011272:Pregnancy, Multiple; D012189:Retrospective Studies; D013610:Tachycardia / Q000209:etiology*; D014427:Twins / Q000502:physiology*; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic