title: Superimposed inspiratory work of the Siemens Servo 300 ventilator during continuous positive airway pressure.
abstract: OBJECTIVE
  To compare the superimposed inspired work of breathing (SIW) of the Siemens Servo 300 ventilator with the Siemens Servo 900 C ventilator.
  
  
  METHODS
  Comparisons made at continuous positive airway pressure (CPAP) levels of 0, 4, and 8 cmH2O, and at trigger sensitivities of -1 and -2 cmH2O, and flow triggering.
  
  
  METHODS
  General intensive care unit in a University teaching hospital.
  
  
  METHODS
  7 patients receiving CPAP. At all levels of CPAP, the SIW was significantly less with the Siemens Servo 300 ventilator as compared to the Siemens Servo 900 C ventilator despite similar trigger sensitivities. No significant difference was found in the SIW of the Servo 300 ventilator when comparing trigger sensitivities of -1 cmH2O, -2 cmH2O, and flow triggering. Different levels of CPAP had no effect on SIW.
  
  
  CONCLUSIONS
  The Siemens Servo 300 ventilator entails less superimposed inspiratory work of breathing than the Siemens Servo 900 C ventilator.
authors: Department of Anaesthesia and Intensive Care, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT.
authors: I K
authors: IK
authors: Tan
authors: S B
authors: SB
authors: Bhatt
authors: Y H
authors: YH
authors: Tam
authors: T A
authors: TA
authors: Buckley
authors: T E
authors: TE
authors: Oh
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D003422:Critical Care; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011175:Positive-Pressure Respiration; D015656:Respiratory Mechanics; D012122:Ventilators, Mechanical / Q000592:standards*; D014939:Work of Breathing