According to the different intervention methods, surgical abortion is needed during an abortion procedure, while medical abortion might not be necessary. Embryonic arrest, also known as missed abortion, occurs during pregnancy due to various factors which result in the absence of a fetal heartbeat in the gestational sac or fetus. Most cases of embryonic arrest occur during early pregnancy. If no fetal heartbeat is observed by the 9th week of pregnancy, it is diagnosed as embryonic arrest. Once embryonic growth ceases, it is crucial to intervene artificially as soon as possible to expel the gestational sac from the uterus. Common methods of artificial intervention include medical abortion and surgical abortion. If surgical abortion is chosen for an embryonic arrest, it involves direct curettage or evacuation of the uterus. Embryonic arrest can also be treated with medical abortion, which involves taking oral medication to stimulate uterine contractions, soften the cervix, and expel the gestational sac from the uterus. A follow-up is required about two weeks after the abortion. If there is no residual material in the uterine cavity, then curettage is not necessary; however, if substantive residuals or blood signals are present inside the uterine cavity, then curettage is needed.