Objective:To understand the cognition degree and implementation intention of patients with respiratory failure,their family members,and medical staff on advance directives(AD)plan.Methods:A total of 60 cases of respiratory failure patients,family members,and medical personnel from a Grade A Tertiary hospital were investigated by the questionnaire to understand the understanding degree and attitude of AD plan.The feasibility and necessity of AD plan were analyzed.Results:A total of 47 cases(78.33%)of patient...