title: An evaluation of an ultrasound unit for continuous monitoring of the fetal heart.
mesh_terms: D036861:Delivery, Obstetric; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart; D006801:Humans; D008722:Methods; D008991:Monitoring, Physiologic / Q000295:instrumentation; D011247:Pregnancy; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation