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Differences in oxygen delivery between portable oxygen concentrators (POC) and liquid oxygen (LO) portable units, pose a question if POCs are equally effective as LOs in reducing exercise-induced hypoxaemia.Randomized, single-blind clinical trial.Thirteen COPD patients (means: age 66±11 year, FEV 1 35.2±13.7% predicted) and respiratory failure (means: PaO 2 52±5mmHg, PaCO 2 ...
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