title: Systolic time intervals of the fetal cardiac cycle.
mesh_terms: D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology* / Q000503:physiopathology; D005865:Gestational Age; D006339:Heart Rate; D006801:Humans; D007743:Labor, Obstetric; D008954:Models, Biological; D011247:Pregnancy; D013997:Time Factors; D014463:Ultrasonography