title: [Study of the fetus by means of the electrocardiogram. I. Fetal and maternal heart rate].
mesh_terms: D004562:Electrocardiography; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D005318:Fetal Heart; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D008722:Methods; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D011272:Pregnancy, Multiple
vernacular_title: Estudio del feto a través del electrocardiograma. I. Frecuencia cardíaca fetal y materna.