I had the Zephyr valves placed in my left lower lobe in November 2023 and couldn't be more impressed! Valves are placed per bronchoscopy under general anesthesia. Had about a 4-day hospital stay for monitoring then flew home. They have allowed me so much more energy and 02 for activities of daily living. Even was impressed with ability to do weights and aerobics in the gym. I am a true advocate! All the testing is to ensure you meet the criteria for placement of the valves. Hope everything goes well.