NYPD cop who sifted through ten tons of 9/11 debris says he saw a ghost 'trying to help' while searching for clues to identify victims from attacks at landfill, book reveals. 1  Sgt. Frank Marra, 48, said he saw ghost of African American woman, who was dressed in white as a Red Cross worker from Second World War.
oxygen debt. a state that arises in very active muscles when insufficient oxygen is supplied by the lungs, causing the muscle tissue to respire anaerobically with the production of LACTIC ACID. When muscular activities slow down, the rate and depth of breathing remains at a high level until the lactic acid has been oxidized.
For Medicare to cover the cost of home oxygen therapy, the patient must have severe hypoxemia defined as a partial pressure of arterial oxygen (PaO2) level of less than 55 mm Hg or an arterial oxygen saturation (SpO2) of less than 88% on room air and at rest.