Effect of PEEP on Lung Recruitment - Bag-Mask Ventilation (Pig Lungs) Before and after adding a PEEP Valve. You can see the effect PEEP has on the lungs to maintain recruitment and ultimately prevent ventilation induced lung injury. Original Video by Dr. Jeremiah Escajeda @JerEscajeda #PEEP #Lungs #Cadaver #Simulation #clinical #video #Pulmonary #Positive #Pressure #BVM