Real-time--directed M-mode echocardiography: a new technique for accurate and rapid quantitation of the fetal preejection period and ventricular ejection time of the right and left ventricles.
D002302:Cardiac Output; D004452:Echocardiography / Q000379:methods*; D005318:Fetal Heart / Q000502:physiology*; D006801:Humans; D013318:Stroke Volume