title: The pre-ejection period of the fetal heart: detection during labor with Doppler ultrasound.
mesh_terms: D001021:Aortic Valve / Q000502:physiology; D002302:Cardiac Output; D003201:Computers; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D006801:Humans; D007743:Labor, Obstetric; D008722:Methods; D008943:Mitral Valve / Q000502:physiology; D011247:Pregnancy; D014465:Ultrasonics