“…The indications for PPV include pulmonary parenchymal disease (PPD), which results in inadequate blood oxygenation and ventilatory failure, leading to inadequate pulmonary carbon dioxide elimination (Mellema et al , Clare et al , Hopper et al ). The survival rates of ventilated human and veterinary patients with oxygenation or ventilatory failures are 20 to 30% and 50 to 70%, respectively (King et al , Macintyre , Campbell et al , Beal et al , Meade et al , Brower et al , Vasillev et al , Lee et al , Boles et al , Hopper et al , Esteban et al , Rutter et al ).…”