The main purpose of this study is to evaluate the effects of high-flow nasal therapy (HFNT) oxygen compared to long-term oxygen therapy (LTOT) on dyspnea and quality of life in intersititial lung disease patients with chronic respiratory failure and persistent breathlessness in whom LTOT has already been initiated.
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SGRQ questionnaire : Saint George's Respiratory Questionnaire (symptom component)
Timeframe: 2 weeks