Monitoring Ventilator Associated Events: Slide Presentation Agency for Healthcare Research and Quality VAP PPTX A retrospective evaluation of multiple definitions for ventilator associated pneumonia (VAP) diagnosis in an Australian regional VAP Bundle Ventilator Associated Pneumonia Ventilator Associated Pneumonia ( VAP) is a lung infection that occurs in patients who are on mechanical ventilation for more than 48 hours. A VAP bundle is a set of Ventilator Associated Pneumonia: Definition & Guidelines Study.com