Ventilator Associated Events PIVARES Ventilator Associated Event Surveillance: Facilitator Guide Agency for Healthcare Research and Quality Ventilator Associated Pneumonia (VAP): Why is it so difficult to define? In real world practice: The diagnosis of VAP remains more an exercise in clinical integration than strict adherence to criteria. The Problems Diagnosing Ventilator Associated Pneumonia VAP, VAC, IVAC and Ventilator Associated Events: The Need for Objectivity for Surveillance Pneumonia (Ventilator associated [VAP] and non ventilator associated Pneumonia [PNEU]) Event