The incidence of adverse outcome within 14 days after admission: Patients with conscious dyspnea; SpO2 = 94% or respiratory frequency = 24 times / min in the state of resting without oxygen inhalation;

The incidence of adverse outcome within 14 days after admission: Patients with conscious dyspnea; SpO2 = 94% or respiratory frequency = 24 times / min in the state of resting without oxygen inhalation;