Embryonic arrest without a fetal heartbeat can be caused by many factors. For example, taking medications prohibited during pregnancy, exposure to harmful substances, radiation, or infections with bacteria or viruses during pregnancy. Other factors include genetic issues and poor emotional state of the pregnant woman during pregnancy. All these factors can affect the normal development of the embryo. If an ultrasound examination reveals no fetal heartbeat, it can be determined that the embryo has ceased to develop, and prompt treatment should be carried out.