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Δευτέρα 26 Οκτωβρίου 2015

Impact of overlap syndrome on severity of acute exacerbation of chronic obstructive pulmonary disease

Dipti Gothi, Shiv Sagar Gupta, Nishith Kumar, Kartik Sood

Lung India 2015 32(6):578-583

Background: The severity of exacerbation in chronic obstructive pulmonary disease (COPD) due to the overlap of obstructive sleep apnea syndrome (OSAS) is not known. Aims: To find out the 1) severity of acute exacerbation of COPD (AECOPD) in patients with overlap syndrome compared to only COPD, 2) prevalence of overlap syndrome in AECOPD, and 3) clinical characteristics of COPD compared to overlap syndrome. Materials and Methods: Fifty-one patients admitted with AECOPD were classified into; Mild exacerbation: Normal arterial blood gases (ABG) treated with antibiotics, Moderate: Normal ABG treated with parenteral corticosteroids, Severe: Type 1 respiratory failure, Very severe: Type 2 respiratory failure with normal pH and Life-threatening: Type 2 respiratory failure with pH <7.35. They were evaluated for OSAS with full polysomnography after the exacerbation subsided and analysed depending on presence or absence of overlap syndrome. Results: The majority of only COPD cases (26/38) had mild and moderate exacerbations whereas majority of overlap patients (9/13) had severe, very severe and life-threatening exacerbations (statistically significant, P = 0.021). Of 51 patients, 13 had OSAS i.e. the prevalence of overlap in AECOPD was 25.5%. The mean BMI in only COPD and overlap syndrome was 20.70 ± 8.03 kg/m2 and 31.82 ± 5.80 kg/m2 (P < 0.001), respectively. Metabolic syndrome was recorded in 2/36 (5.3%) patients in only COPD and 6/13 (46.2%) patients in overlap (P < 0.001). Conclusion: Overlap syndromes are more likely have respiratory failure compared to only COPD during AECOPD. AECOPD have a high prevalence of OSAS. Overlap syndrome have significantly higher likelihood of obesity and metabolic syndrome compared to only COPD.

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