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Oxygen Treatment in Intensive Care and Emergency Medicine.

BACKGROUND: Oxygen treatment is often life-saving, but multiple studies in recent years have yielded evidence that the indiscriminate administration of oxygen to patients in the intensive care unit and emergency room can cause hyperoxia and thereby elevate mortality.

METHODS: This review is based on prospective, randomized trials concerning the optimum use of oxygen in adult medicine, which were retrieved by a selective search in PubMed, as well as on pertinent retrospective studies and guideline recommendations.

RESULTS: 13 prospective, randomized trials involving a total of 17 213 patients were analyzed. In patients with acute exacerbations of chronic obstructive pulmonary disease (COPD) and in ventilated intensive-care patients, normoxia was associated with a lower mortality than hyperoxia (2% vs. 9%). In patients with myocardial infarction, restrictive oxygen administration was associated with a smaller infarct size on cardiac MRI at 6 months compared to oxygen administration at 8 L/min (13.1 g vs. 20.3 g). For patients with stroke, the currently available data do not reveal any benefit or harm from oxygen administration. None of the trials showed any benefit from the administration of oxygen to non-hypoxemic patients; in fact, this was generally associated with increased morbidity or mortality.

CONCLUSION: Hypoxemia should certainly be avoided, but the fact that the liberal administration of oxygen to patients in intensive care units and emergency rooms tends to increase morbidity and mortality implies the advisability of a conservative, normoxic oxygenation strategy.

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