[ON CHANGES IN THE FETAL HEART BEAT DURING THE 1ST STAGE OF LABOR (PHONOCARDIOGRAPHIC STUDIES)].
D005260:Female; D005318:Fetal Heart; D005333:Fetus; D006339:Heart Rate; D006801:Humans; D007743:Labor, Obstetric; D010701:Phonocardiography; D011247:Pregnancy
FETAL HEART; LABOR; PHONOCARDIOGRAPHY; PREGNANCY