The feticide is a legal and ethical obligation during a termination of pregnancy after 22 weeks' gestation. This method raise concerns about the fetal pain, maternal complications and the fetopathologic analysis. There are few studies on the subject. Investigators want to evaluate a drug in order to facilitate this method technically and emotionally challenging. They want to achieve a quick fetal asystole, a fetal analgesia, a maternal security and a optimal fetopathologic analysis. A drug, remifentanil Ultiva®, seems could meet its properties, it is a powerful morphine. A phase 2 clinical trial has assessed the feasibility, efficacy and safety of Ultiva®. They had not been able to prove bradycardia or lethal effect of Ultiva injected alone but the feasibility and safety were good.