International Journal of Medical Sciences

- assess on 2 occasions at least 3 weeks apart when COPD stable. Oxygen should be given for ≥ 15 hours per day (by a concentrator). LTOT indicated when PaO2 < 7.3kPa (or < 8.0kPa plus right heart strain, pulmonary hypertension, peripheral oedema, or nocturnal hypoxia [SpO2 ................
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