ASV

Adaptive Support Ventilation

  • Intelligent ventilation mode for passive and spontaneously breathing adult and pediatric patients
  • Automatically adjusts ventilation to lung mechanics and applies lung-protective strategies
  • Shortens ventilation time

How ASV works

ASV maintains an operator set minute volume and automatically determines an optimal tidal volume / respiratory rate combination based on the minimal work of breathing principle described by Otis (Otis 1954). ASV takes into account the patient’s respiratory mechanics, which are measured breath-by-breath by the proximal flow sensor. ASV ensures optimal ventilation for each patient during passive ventilation, spontaneous breathing, and weaning.

 

 

ASV in passive patients

In passive patients, ASV is a volume-targeted pressure controlled mode with automatic adjustment of inspiratory pressure, respiratory rate, and inspiratory/expiratory time ratio. Maximum tidal volume is controlled by setting a maximum inspiratory pressure. Expiratory time is determined according to the expiratory time constant in order to prevent dynamic hyperinflation.

ASV in active patients

In spontaneously breathing patients, ASV is a volume-targeted pressure support mode with automatic adjustment of pressure support according to the spontaneous respiratory rate. The automatic decrease of pressure support when the patient recovers their inspiratory strength is very useful for weaning. ASV can also be used to perform a weaning trial before extubation. 

Ken Hargett

Director Respiratory Care

The Methodist Hospital, Houston (TX), USA

ASV adapts to the patient's needs by continuously adjusting the pressure needed while maintaining a safe ventilation range. It provides all levels of ventilation regardless what the patient’s needs are.

Craig Jolly

Adult Clinical Education Coordinator

University Medical Center, Lubbock (TX), USA

What ASV does for us as therapists is it allows us to make sure that we are crafting the breath in the absolutely best possible way for that patient at that time.

Scientific evidence on ASV

Since its introduction in 1998, ASV has received a lot of interest from the scientific community and has been the topic of well over 30 studies. 

Studies show that:

  • In passive patients, ASV selects different tidal volume / respiratory rate combinations for normal lung, COPD, and ARDS patients (Arnal 2008).
  • In active patients, ASV decreases work of breathing and improves patient-ventilator synchrony (Wu 2010, Tassaux 2010). 
  • In the ICU, ASV decreases the weaning duration in medical patients (Chen 2011) and COPD patients (Kirakli 2011).
  • In post-cardiac surgery, ASV allows earlier extubation than conventional modes (Gruber 2008, Sulzer 2001) with fewer manual adjustments (Petter 2003) and fewer ABG analyses performed (Sulzer 2001). 

Yes, I would like to download the
free ASV software simulation

Get the ASV software simulation for free. Just provide your contact information and we will send you the download link. The software simulation is a fully functional representation of an ICU ventilator and includes a patient simulation with adjustable lung mechanics.

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