Fetal heart rate base line variability.
D001021:Aortic Valve / Q000502:physiology; D002302:Cardiac Output; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D005333:Fetus; D006339:Heart Rate; D006801:Humans; D008991:Monitoring, Physiologic; D010991:Plethysmography; D011247:Pregnancy; D011674:Pulse; D013997:Time Factors; D014465:Ultrasonics