Fill in the Blanks Ventilación mecánica invasivaOnline version Ventilación mecánica invasiva by Camila Hurtado 1 gas The primary goal of mechanical ventilation is to ensure adequate exchange in patients with respiratory failure . 2 endotracheal Invasive mechanical ventilation requires the insertion of a ( n ) tube , either through the mouth or nose , or a tracheostomy . 3 PEEP Pressure End Positive Expiratory - ( ) pressure is applied at the end of expiration to prevent alveolar collapse and improve oxygenation . 4 volume The mode of ventilation in which the ventilator delivers a preset number of breaths with a fixed tidal volume is called controlled ventilation .