title: [Value of the Doppler ultrasonic study in the management of the problem of the 1st trimester of pregnancy].
mesh_terms: D004452:Echocardiography; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D005318:Fetal Heart; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*
vernacular_title: Importancia de la investigación ultrasónica Doppler en el manejo de los problemas del primer trimestre del embarazo.