PSA oxygen concentrator working an not a refinery. It does not manufacture oxygen from other elements and it does not store gas from a prior fill. It separates the oxygen already present in room air from the much larger volume of nitrogen, argon, carbon dioxide, and water vapour that surrounds it. The mechanism — pressure swing
COPD oxygen prescription in India.Long-term oxygen therapy remains one of only three interventions — alongside smoking cessation and, in selected patients, pulmonary rehabilitation or lung volume reduction — that extends survival in COPD. The evidence anchoring this is four decades old, the thresholds have not moved materially, and yet in Indian practice, LTOT prescription
