Table 2.

Specific care measures.

Implementation phase	Measures
Initial stage	At the initial stage of noninvasive ventilation, the nurse should give the patient a brief education about the necessity and safety of noninvasive ventilation to avoid emotional fluctuations. The mask should be selected according to the patient's face shape to avoid mask leakage, the appropriate tightness should be adjusted, and the sponge or gauze should be placed on the patient's frontal bone and nasal bridge.
Medium stage	This stage is 2 h after the patient's noninvasive ventilation until the disease is stable. At this time, observe the patient's adaptation to noninvasive ventilation, in order to avoid the patient's agitation, divert the patient's attention during this process, and elevate the head of the bed according to the patient's acceptance, and keep the patient's head and neck and airway vertical. Pay attention to whether there is sputum in the patient's airway, and if there is sputum, remove it in time to avoid the airway being obstructed.
Late stage	This stage is from the patient's disease stabilization to the ventilator withdrawal stage. (i) Withdrawal care: before withdrawing the ventilator, comprehensively assess whether the patient meets the withdrawal criteria, explain to the patient in detail the reasons and precautions for withdrawal, monitor the vital signs in real-time during the withdrawal process, and be prepared to get on the ventilator again at any time. (ii) Psychological guidance: pay close attention to the psychological and emotional changes of the patients, use visual simulation scoring to rate the patients' psychological state, and grade the care according to the score. <2 points for level 1 psychological care, use common psychological care, focus on the establishment of a sense of security when caring for the patients, focus on the current problems that the patients have, and understand the underlying causes of the patients' psychological problems. Use comfort, communication, and explanation to give patients psychological support and improve their sense of security. 2 points ≤ score < 4 points for level 2 psychological care, use mental relaxation method to improve patients' psychology and use light music in a quiet environment to allow patients to achieve a state of general relaxation to relieve mental tension and improve psychology. ≥4 points of level 3 psychological care to give patients family support, build confidence, and relieve negative emotions. During the implementation process, patients were made aware of the adverse psychological effects on recovery after treatment to establish a correct positive mindset.
Later consolidation care	In the later stage, we did the consolidation nursing intervention of respiratory function exercise, recorded the patient's respiratory function exercise daily, actively guided and helped the patient in the process of exercise, did about 0.5 h of exercise each time, and performed 3-5 times of exercise daily. During the exercise process, patients were encouraged appropriately according to their positive degree of exercise, so as to improve their compliance with exercise and promote rapid recovery from disease.