title: [Evaluation of tidal volume delivered by ventilators during volume-controlled ventilation].
abstract: OBJECTIVE
  To study the ways which ensure the delivery of enough tidal volume to patients under various conditions close to the demand of the physician.
  
  
  METHODS
  The volume control ventilation model was chosen, and the simulation lung type was active servo lung ASL 5000 or Michigan lung 1601. The air resistance, air compliance and lung type in simulation lungs were set. The tidal volume was obtained from flow analyzer PF 300. At the same tidal volume, the displaying values of tidal volume of E5, Servo i, Evital 4, and Evital XL ventilators with different lung types of patient, compliance of gas piping, leakage, gas types, etc. were evaluated.
  
  
  RESULTS
  With the same setting tidal volume of a same ventilator, the tidal volume delivered to patients was different with different lung types of patient, compliance of gas piping, leakage, gas types, etc. Reducing compliance and increasing resistance of the patient lungs caused high peak airway pressure, the tidal volume was lost in gas piping, and the tidal volume be delivered to the patient lungs was decreased. If the ventilator did not compensate to leakage, the tidal volume delivered to the patient lungs was decreased. When the setting gas type of ventilator did not coincide with that applying to the patient, the tidal volume be delivered to the patient lungs might be different with the setting tidal volume of ventilator.
  
  
  CONCLUSIONS
  To ensure the delivery of enough tidal volume to patients close to the demand of the physician, containable factors such as the compliance of gas piping, leakage, and gas types should be controlled.
authors.affiliation: Medical Support Division, PLA General Hospital, Beijing 100853, China, Corresponding author: Cao Desen, Email: caodesen2012@126.com.
authors.forename: Juan
authors.initials: J
authors.lastname: Zhou
authors.forename: Yong
authors.initials: Y
authors.lastname: Yan
authors.forename: Desen
authors.initials: D
authors.lastname: Cao
mesh_terms: D007385:Intermittent Positive-Pressure Ventilation; D008168:Lung; D008954:Models, Biological; D013990:Tidal Volume; D012122:Ventilators, Mechanical