Intensive Care Medicine

, Volume 34, Issue 10, pp 1788–1795

A randomised, controlled trial of conventional versus automated weaning from mechanical ventilation using SmartCare™/PS

  • Louise Rose
  • Jeffrey J. Presneill
  • Linda Johnston
  • John F. Cade

DOI: 10.1007/s00134-008-1179-4

Cite this article as:
Rose, L., Presneill, J.J., Johnston, L. et al. Intensive Care Med (2008) 34: 1788. doi:10.1007/s00134-008-1179-4



Preliminary assessment of an automated weaning system (SmartCare™/PS) compared to usual management of weaning from mechanical ventilation performed in the absence of formal protocols.

Design and setting

A randomised, controlled pilot study in one Australian intensive care unit.


A total of 102 patients were equally divided between SmartCare/PS and Control.


The automated system titrated pressure support, conducted a spontaneous breathing trial and provided notification of success (“separation potential”).

Measurements and results

The median time from the first identified point of suitability for weaning commencement to the state of “separation potential” using SmartCare/PS was 20 h (interquartile range, IQR, 2–40) compared to 8 h (IQR 2–43) with Control (log-rank = 0.3). The median time to successful extubation was 43 h (IQR 6–169) using SmartCare/PS and 40 (14–87) with Control (log-rank P = 0.6). Unadjusted, the estimated probability of reaching “separation potential” was 21% lower (95% CI, 48% lower to 20% greater) with SmartCare/PS compared to Control. Adjusted for other covariates (age, gender, APACHE II, SOFAmax, neuromuscular blockade, corticosteroids, coma and elevated blood glucose), these estimates were 31% lower (95% CI, 56% lower to 9% greater) with SmartCare/PS. The study groups showed comparable rates of reintubation, non-invasive ventilation post-extubation, tracheostomy, sedation, neuromuscular blockade and use of corticosteroids.


Substantial reductions in weaning duration previously demonstrated were not confirmed when the SmartCare/PS system was compared to weaning managed by experienced critical care specialty nurses, using a 1:1 nurse-to-patient ratio. The effect of SmartCare/PS may be influenced by the local clinical organisational context.


28. Mechanical ventilation: weaning.


Respiration Artificial Mechanical ventilation Weaning Automated weaning Closed-loop ventilation 

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Louise Rose
    • 1
    • 4
  • Jeffrey J. Presneill
    • 2
    • 5
  • Linda Johnston
    • 3
  • John F. Cade
    • 2
  1. 1.The University of Melbourne and Intensive Care Unit, The Royal Melbourne HospitalVictoriaAustralia
  2. 2.Intensive Care UnitThe Royal Melbourne HospitalVictoriaAustralia
  3. 3.Neonatal Nursing Research, School of NursingThe University of Melbourne, Royal Children’s Hospital and Murdoch Children’s Research InstituteVictoriaAustralia
  4. 4.Lawrence S. Bloomberg Faculty of NursingUniversity of TorontoTorontoCanada
  5. 5.Intensive Care UnitSt Vincent’s HospitalFitzroy, VictoriaAustralia