Impact of gastro-oesophageal reflux disease symptoms on COPD exacerbation

Terada, K.; Muro, S.; Sato, S.; Ohara, T.; Haruna, A.; Marumo, S.; Kinose, D.; Ogawa, E.; Hoshino, Y.; Niimi, A.; Terada, T.; Mishima, M.
November 2008
Thorax;Nov2008, Vol. 63 Issue 11, p951
Academic Journal
Background: The association between gastro-oesophageal reflux disease (GOAD) and chronic obstructive pulmonary disease (COPD) exacerbation has so far remained unclear. Objective: To prospectively establish the clinical significance of GOAD symptoms on exacerbation. Methods: 82 patients with COPD and 40 age matched controls were enrolled in this study. Symptoms were evaluated by a questionnaire using the Frequency Scale for the Symptoms of GOAD (FSSG). Patients with COPD were prospectively surveyed for 6 months, and episodes of exacerbation were identified using a diary based on modified Anthonisen's criteria. Exhaled breath condensate (EBC) pH was measured in both groups, and induced sputum was evaluated in patients with COPD. Results: Positive GOAD symptoms were reported in 22 (26.8%) patients with COPD and in five (12.5%) controls (p = 0.10). The frequency of exacerbations was significantly associated with the FSSG score (p = 0.03, = 0.24, 95% CI 0.02 to 0.43). Multiple regression analysis revealed that GOAD symptoms were significantly associated with the occurrence of exacerbations (p<0.01; relative risk 6.55, 95% CI 1.86 to 23.11). EBC pH was inversely correlated with FSSG score in both groups (p = 0.01, r = -0.37, 95% CI -0.55 to -0.14 in patients with COPD, and p<0.01, r = -0.45, 95% CI -0.67 to -0.16 in control subjects). Conclusions: GOAD symptoms were identified as an important factor associated with COPD exacerbation.


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