What are the benefits of synchronized intermittent mandatory ventilation (SIMV) for respiratory failure?

Updated: Apr 07, 2020
  • Author: Ata Murat Kaynar, MD; Chief Editor: Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM  more...
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Most modern ventilators are capable of synchronized IMV (SIMV), whereby the ventilator attempts to deliver the mandatory breaths in synchrony with the patient’s own inspiratory efforts. In essence, the ventilator allows the patient an opportunity to breathe. If the patient makes an inspiratory effort during a window of time determined by the IMV rate, the ventilator delivers a mandatory breath in response to the patient’s inspiratory effort. However, if no inspiratory effort is detected by the ventilator, a time-triggered breath is delivered.

Compared with standard IMV, SIMV may improve patient comfort and may limit dynamic hyperinflation, which may occur when a preset breath is delivered immediately after the patient’s spontaneous inspiratory effort (ie, before exhalation).

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