What is the definition of hospitalacquired pneumonia (HAP) and how does it differ from ventilatorassociated pneumonia (VAP)? The 2009 US CDC NHSN clinical surveillance definition for Download Table VENTILATOR = LIFE SUPPORT but also VAP RISK. Up to 20% of ventilated patients >48 hrs develop VAP. Mortality? Can reach 50%. Here's what actually matters in ICU rounds Ventilator Acquired Pneumonia Found to Fall Short as Quality Indicator in Trauma