title: The pre-ejection period of the fetal heart: patterns of change during labor.
mesh_terms: D000653:Amniotic Fluid; D001021:Aortic Valve / Q000502:physiology; D001157:Arterial Occlusive Diseases / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D005318:Fetal Heart / Q000502:physiology* / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D007743:Labor, Obstetric; D008722:Methods; D009119:Muscle Contraction; D010781:Photography; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011312:Pressure; D014463:Ultrasonography; D014469:Umbilical Arteries / Q000503:physiopathology; D014599:Uterus / Q000502:physiology