2.5 SDMS CMEs: 2.5 Fetal Echocardiography Credits. In the first lecture, you will review the basic types of arrhythmias encountered in the fetus. You will learn how to assess fetal arrhythmias with m-mode and spectral Doppler so that you have a clear understanding of the importance. You will also review the maternal factors that predispose a fetus to an arrhythmia. In the second lecture, you will review how to acquire a Three-Vessel Trachea view and its usefulness in helping diagnose a variety of structural congenital heart defects in the fetus.