[Early detection of fetal cardiac activity and determination of placental position by an ultrasonic method based on the Doppler principle].
D000033:Abortion, Threatened / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D005318:Fetal Heart; D006339:Heart Rate; D006801:Humans; D007746:Labor Presentation; D008722:Methods; D010920:Placenta; D011247:Pregnancy; D011258:Pregnancy Tests; D011296:Prenatal Diagnosis; D014463:Ultrasonography; D014594:Uterine Neoplasms / Q000175:diagnosis
Rannee vyiavlenie serdechnoĭ deiatel'nosti ploda i oprendelenie raspolozheniia platsenty ul'trazvukovym metodom, osnovannym na printsipe Dopplera.