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Snoring and nocturnal reflux: association with lung function decline and respiratory symptoms

Abstract : Introduction The study aim was to examine the association of snoring and nocturnal gastro-oesophageal reflux (nGOR) with respiratory symptoms and lung function, and if snoring and/or nGOR associated with a steeper decline in lung function. Methods Data from the third visit of the European Community Respiratory Health Survey (ECRHS) was used for cross-sectional analysis. Pre- and post-bronchodilator spirometry was performed, and information on sleep, nGOR and respiratory symptoms was collected (n=5715). Habitual snoring and nGOR were assessed by questionnaire reports. Pre-bronchodilator spirometry from ECRHS I, II and III (20 years follow-up) were used to analyse lung function changes by multivariate regression analysis. Results Snoring and nGOR were independently associated with a higher prevalence of wheeze, chest tightness, breathlessness, cough and phlegm. The prevalence of any respiratory symptom was 79% in subjects with both snoring and nGOR versus 56% in those with neither (p\textless0.001). Subjects with both snoring and nGOR had more frequent exacerbations (adjusted prevalence 32% versus 19% among \textquotedblleftno snoring, no nGOR\textquotedblright, p=0.003). Snoring but not nGOR was associated with a steeper decline in forced expiratory volume in 1 s over 10 years after adjusting for confounding factors (change in % predicted -5.53, versus -4.58 among \textquotedblleftno snoring\textquotedblright, p=0.04) and forced vital capacity (change in % predicted -1.94, versus -0.99 among \textquotedblleftno snoring\textquotedblright, p=0.03). Conclusions Adults reporting both habitual snoring and nGOR had more respiratory symptoms and more frequent exacerbations of these symptoms. Habitual snoring was associated with a steeper decline in lung function over time.
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Össur Ingi Emilsson, Shadi Hägg, Eva Lindberg, Karl Franklin, Kjell Torén, et al.. Snoring and nocturnal reflux: association with lung function decline and respiratory symptoms. ERJ Open Research, European Respiratory Society, 2019, 5 (2), pp.00010--2019. ⟨10.1183/23120541.00010-2019⟩. ⟨hal-02860444⟩

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