Optimistic pressure ventilation any of diverse forms of mechanical ventilation during which gas is shipped in to the airways and lungs under favourable stress, making good airway pressure all through inspiration; it might be carried out by means of either an endotracheal tube or simply a nasal mask. See also https://ventilationinstallation91234.blazingblog.com/37555705/not-known-factual-statements-about-ventilation