title: Natural history determinants of the time constants of the fetal electrocardiogram.
abstract: A total of 92 fetuses have been studied during labour using a technique of real-time fetal electrocardiography. This study showed differences in the PR and QRS intervals between male and female infants and also confirmed previous findings of a positive correlation between QRS width and fetal birthweight. The importance of taking natural biological factors into account in the interpretation of the time constants of the FECG is demonstrated.
authors.affiliation: Department of Obstetrics and Gynaecology, Queen's Medical Centre, Nottingham, U.K.
authors.forename: M
authors.initials: M
authors.lastname: Morgan
authors.forename: E M
authors.initials: EM
authors.lastname: Symonds
mesh_terms: D001724:Birth Weight; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D008297:Male; D011247:Pregnancy; D014590:Uterine Contraction / Q000502:physiology