Optimistic tension ventilation any of various varieties of mechanical ventilation in which gas is sent to the airways and lungs below optimistic pressure, producing positive airway stress in the course of inspiration; it may be done by means of both an endotracheal tube or even a nasal mask. See also https://ventilationductwork34566.sharebyblog.com/37337252/the-single-best-strategy-to-use-for-ventilation-ductwork