Utilisation of ultrasound Doppler effect for studying foetal cardiac activity.
D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D006801:Humans; D007743:Labor, Obstetric; D008722:Methods; D008991:Monitoring, Physiologic; D011247:Pregnancy; D014463:Ultrasonography