title: A pilot clinical PEP monitor.
mesh_terms: D004301:Doppler Effect; D004582:Electronics, Medical / Q000295:instrumentation; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D005323:Fetal Monitoring / Q000295:instrumentation*; D006801:Humans; D009200:Myocardial Contraction; D011247:Pregnancy; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography