Study the effect of using long term oxygen therapy in patients with interstitial lung disease and chronic hypoxia

long term oxygen can be used in patients with interstitial lung disease with hypoxia and the aim of this study is to k ow whether this will improve life style , exercise tolerance in those patients

Inclusion Criteria :

• patients with ILD and hypoxia with SO2<88 at room air and PO2 < or equal 7.3k.pa or < or equal 8 k.pa in presence of lower limb edema , pulmonary hypertension or polycythemia
• age group 18 : 70

Exclusion Criteria :

• Causes of chronic respiratory failure other than ILD.

patients with ILDs who are prescribed for LTOT between eighteen and seventy years old