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      A comparison of three multidimensional indices of COPD severity as predictors of future exacerbations

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          Abstract

          Background

          Prediction of future exacerbations of chronic obstructive pulmonary disease (COPD) is a major concern for long-term management of this disease.

          Aim

          To determine which of three multidimensional assessment systems (the body mass index, obstruction, dyspnea, and exercise capacity [BODE] index; dyspnea, obstruction, smoking, exacerbations [DOSE] index; or age, dyspnea, obstruction [ADO] index) is superior for predicting exacerbations.

          Methods

          This was a 2-year prospective cohort study of COPD patients. Pulmonary function tests, the 6-minute walk distance (6MWD), Modified Medical Respiratory Council (MMRC) dyspnea scores, chest computed-tomography measurements, and body composition were analyzed, and predictions of exacerbation by the three assessment systems were compared.

          Results

          Among 183 patients who completed the study, the mean annual exacerbation rate was 0.57 events per patient year, which correlated significantly with lower predicted forced expiratory volume in 1 second (FEV 1) ( P < 0.001), lower transfer coefficient of the lung for carbon monoxide (%DLco/VA) ( P = 0.021), lesser 6MWD ( P = 0.016), higher MMRC dyspnea score ( P = 0.001), higher DOSE index ( P < 0.001), higher BODE index ( P = 0.001), higher ADO index ( P = 0.001), and greater extent of emphysema ( P = 0.002). For prediction of exacerbation, the areas under the curves were larger for the DOSE index than for the BODE and ADO indices ( P < 0.001). Adjusted multiple logistic regression identified the DOSE index as a significant predictor of risk of COPD exacerbation.

          Conclusion

          In this study, the DOSE index was a better predictor of exacerbations of COPD when compared with the BODE and ADO indices.

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          Most cited references 19

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          Annual change in pulmonary function and clinical phenotype in chronic obstructive pulmonary disease.

          Although the rate of annual decline in FEV1 is one of the most important outcome measures in chronic obstructive pulmonary disease (COPD), little is known about intersubject variability based on clinical phenotypes. To examine the intersubject variability in a 5-year observational cohort study, particularly focusing on emphysema severity. A total of 279 eligible patients with COPD (stages I-IV: 26, 45, 24, and 5%) participated. We conducted a detailed assessment of pulmonary function and computed tomography (CT) at baseline, and performed spirometry every 6 months before and after inhalation of bronchodilator. Smoking status, exacerbation, and pharmacotherapy were carefully monitored. Emphysema severity was evaluated by CT and annual measurements of carbon monoxide transfer coefficient. Using mixed effects model analysis, the annual decline in post-bronchodilator FEV1 was -32±24 (SD) ml/yr (n=261). We classified the subjects of less than the 25th percentile as Rapid decliners, the 25th to 75th percentile as Slow decliners, and greater than the 75th percentile as Sustainers (-63±2, -31±1, and -2±1 [SE] ml/yr). Emphysema severity, but not %FEV1, showed significant differences among the three groups. Multiple logistic regression analysis demonstrated that the Rapid decliners were independently associated with emphysema severity assessed either by CT or carbon monoxide transfer coefficient. The Sustainers displayed less emphysema and higher levels of circulating eosinophils. Emphysema severity is independently associated with a rapid annual decline in FEV1 in COPD. Sustainers and Rapid decliners warrant specific attention in clinical practice.
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            Underreporting exacerbation of chronic obstructive pulmonary disease in a longitudinal cohort.

            Unreported exacerbations and failure to seek medical attention may have consequences on the health of patients with chronic obstructive pulmonary disease. This study aims to determine the incidence of reported and unreported exacerbations, to identify predictors of reporting, and to compare the impact of reported and unreported exacerbations on health status. The study is based on a multicenter Canadian cohort of patients with chronic obstructive pulmonary disease. Patients completed a daily diary from which exacerbations were defined as a worsening of at least one key symptom (dyspnea, sputum amount, sputum color) recorded on at least 2 consecutive days. Patients were asked to contact the study center if there was a sustained worsening of symptom. Reported exacerbations were events that led to contacting study center or health care visit. The study enrolled 421 patients. The overall incidence of diary exacerbations was 2.7 per person per year, but only 0.8 per person per year was reported. Predictors of reporting included age (HR [hazard ratio], 0.90; 95% confidence interval [CI], 0.81-0.98 per 5-yr increase), FEV(1)% predicted (HR, 0.84; 95% CI, 0.70-0.99 per 10% increase), number of symptoms at onset (HR, 1.59; 95% CI, 1.37-1.84 per additional symptom), and time of the week (HR, 0.35; 95% CI, 0.22-0.56 weekend vs. weekday). There was a clinically important decline in health status for 52% of patients with reported exacerbation and 43% with unreported exacerbations. This study has shown that less than one-third of the exacerbations were reported. The number of symptoms at onset was the most important predictor of reporting an exacerbation, and both reported and unreported exacerbations had an impact on health status.
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              Impact of gastro-oesophageal reflux disease symptoms on COPD exacerbation.

              The association between gastro-oesophageal reflux disease (GORD) and chronic obstructive pulmonary disease (COPD) exacerbation has so far remained unclear. To prospectively establish the clinical significance of GORD symptoms on exacerbation. 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 GORD (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. Positive GORD 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, r = 0.24, 95% CI 0.02 to 0.43). Multiple regression analysis revealed that GORD 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). GORD symptoms were identified as an important factor associated with COPD exacerbation.
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                Author and article information

                Journal
                Int J Chron Obstruct Pulmon Dis
                Int J Chron Obstruct Pulmon Dis
                International Journal of COPD
                International Journal of Chronic Obstructive Pulmonary Disease
                Dove Medical Press
                1176-9106
                1178-2005
                2013
                2013
                31 May 2013
                : 8
                : 259-271
                Affiliations
                [1 ]Divisions of Pulmonary Medicine, Infectious Disease, and Oncology, Department of Internal Medicine
                [2 ]Respiratory Care Clinic, Nippon Medical School, Tokyo, Japan
                [3 ]Respiratory Research Unit, Peninsula Medical School, Plymouth, UK
                Author notes
                Correspondence: Takashi Motegi, Respiratory Care Clinic, Nippon Medical School, 4-7-15-8F, Kudan-minami, Chiyoda-ku, Tokyo, 102-0074, Japan, Tel +81 3 5276 2325, Fax +81 3 5276 2326, Email mo-dr@ 123456nms.ac.jp
                Article
                copd-8-259
                10.2147/COPD.S42769
                3674751
                23754870
                © 2013 Motegi et al, publisher and licensee Dove Medical Press Ltd

                This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.

                Categories
                Original Research

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