Clinical Hyperbaric Practitioner (CHP). CHP represents the introductory 40 hour course of instruction in a practitioner’s education and focuses on use of recompression chambers in clinical hyperbaric settings. This course teaches the medical use of oxygen at a level higher than atmospheric pressure and the management of patients in the clinical setting. In order to certify, members must be a MD, DO, PA or an ARNP working on the direct coordination of a DO or MD. The equipment required consists of a pressure chamber, which may be of rigid or flexible construction, and a means of delivering 100% oxygen. This is a 40 hour course in Diving and Hyperbaric Medicine.