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Oxygen (O2) Therapy: _____ While we inhale 21% of oxygen and 0.04% of carbon dioxide, we exhale 17% of oxygen and 4% of carbon dioxide. _____ Prologue: Oxygen (O2) is a vital element in human survival and plays a major role in a diverse range of biological and physiological processes. Oxygen therapy means using an oxygen cylinder or a machine to breathe in air that contains more oxygen than normal. Oxygen is widely available and commonly prescribed by medical and paramedical staff. In medical practice, it is among the most universally used agents for the treatment of critical illness and part of the routine treatment in acute shock and emergency medicine. Proper application of oxygen therapy and airway management is lifesaving. In the absence of O2 (hypoxia), cellular respiration ceases and irreversible cellular injury and death occur within minutes. Administered correctly it may be lifesaving. However, renaissance physician Paracelsus noted: […]
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