Among the conditions that require a cesarean section, uterine rupture, premature separation of normally implanted placenta, umbilical cord prolapse, and sustained bradycardia require an extremely urgent cesarean section (grade A) for immediate delivery. Multidisciplinary collaboration involving multiple departments is essential to perform this operation, and prompt and precise preparation by nurses before the patient’s arrival is particularly important. To improve our hospital’s readiness for patients requiring extremely urgent cesarean section, we developed action cards, identified problems through repeated simulations, and revised action cards to address these problems. The resulting action cards was used in the clinical setting and appears to be a useful tool to support nurses in taking prompt effective action.