How long it takes from pupil dilation to death depends largely on the specific cause of the patient’s illness and the severity of the condition. For example, the current respiratory circulation as well as the function of all other organs is also determined by the current treatment and supportive maintenance. If the patient is in a deep coma, with dilated pupils, no spontaneous respiration, and the circulation is maintained by vasoactive drugs and fluids, death is inevitable and may occur at any time when all drugs and ventilatory support are withdrawn. If the patient’s pupils are dilated, but some circulatory function exists and the ventilator maintains the patient’s respiration, it may be possible to maintain the patient for some time. Therefore, the exact time of death is multifactorial and requires comprehensive judgment. If the patient’s pupils are dilated, the family should immediately call the 120 emergency telephone number, and promptly sent to the hospital for treatment.