9Pryor JA.Physiotherapy for airway clearance in adults[J].Eur Respir,1999,14(10):1418.
10Lorente L,Lecuona M,Galvan R,et al.Periodically changing ventilator circuits is not necessary to prevent ventilator-associated pneumonia when a heat and moisture exchanger is used[J].Infect Control Hosp Epidemio1,2004,25(12):1077.