Auto Flow - Automatically adjusts and optimizes inspiratory flow in volumetric ventilation modes and minimizes airway pressure. Possibility of spontaneous breathing during the entire ventilation cycle. Used in combination with Option V apor View (and V apor 3000 / DV apor 3000), the Dräger Perseus A500 provides state-of-the-art oxygen and anesthetic agent prediction technology, allowing you to perform anesthesia more confidently with minimal and low flow rates.