الفهرس 
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Abstract
A prospective study was conducted in the Chest Department of Minia Cardiothoracic University Hospital from December 2019 to December 2022. The study had a total of 44 participants diagnosed with interstitial lung disease (ILD), who were categorized into two groups based on their apnea-hypopnea index (AHI) as determined by polysomnography (PSG). group I consisted of 27 patients who had interstitial lung disease (ILD) without obstructive sleep apnea (OSA). On the other hand, group II comprised 17 patients who had ILD with OSA. Among the patients in group II, 7 had mild OSA while the remaining 10 had moderate to severe OSA.
In summary, it can be concluded that ILD is linked to significant changes in sleep patterns, such as reduced sleep efficiency, increased frequency of arousals, decreased duration of REM sleep, and a greater level of sleep fragmentation. In addition to the impact on sleep architecture, our study revealed a significant occurrence of obstructive sleep apnea (OSA) within the population of patients diagnosed with interstitial lung disease (ILD), encompassing chronic hypersensitivity pneumonitis (CHP), connective-tissue associated diffuse parenchymal lung disease (DPLD), and idiopathic pulmonary fibrosis (IPF). The ODI (oxygen desaturation index) and the proportion of sleep time with oxygen saturation below 90% were shown to be the most distinguishing markers between patients diagnosed with obstructive sleep apnea (OSA) and those without the condition. Hence, it is recommended that nocturnal oximetry be conducted in all individuals diagnosed with fibrotic diffuse parenchymal lung disease (DPLD) in order to identify those who necessitate a more comprehensive assessment using polysomnography (PSG).