Recompression Therapy (Hyperbaric Oxygen Therapy) By Richard E Moon, MD, Duke University Medical Center Reviewed / Revised Apr 2023 View Patient Education Key Points More Information Topic Resources Hyperbaric Oxygen Therapy * Recompression therapy is administration of 100% oxygen for up to several hours in a sealed chamber pressurized to at least 1.9 (usually 1.9 to 3.0) atmospheres, gradually lowered to atmospheric pressure.