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- W2758642068 abstract "There is continuing debate about whether to define airflow obstruction by a post-bronchodilator ratio of forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) below 0.70, or by ratio values falling below the age-dependent lower limit of normal (LLN) derived from general population data.To determine whether using the LLN criterion affects the classification and outcomes of patients previously defined as having chronic obstructive pulmonary disease by the fixed FEV1/FVC ratio.We applied the LLN definition to pooled data from the Tiotropium Safety and Performance in Respimat study that used the fixed FEV1/FVC ratio for the clinical diagnosis of chronic obstructive pulmonary disease.A total of 17,072 patients were analyzed; of these, 1,807 (10.6%) patients had a ratio greater than or equal to LLN. Patients with a ratio greater than or equal to LLN had similar risks of death from any cause and fatal major adverse cardiovascular (CV) event as those below LLN. Patients with a ratio below LLN had a significantly lower risk of major adverse CV events (hazard ratio = 0.69; 95% confidence interval [CI] = 0.55-0.86; P = 0.001), and had significantly greater risks of moderate to severe exacerbation (rate ratio = 1.48; 95% CI = 1.36-1.61; P < 0.0001) and severe exacerbation (rate ratio = 2.01; 95% CI = 1.68-2.40; P < 0.0001) when compared with patients greater than or equal to LLN. Study outcomes by treatment arm (5 μg tiotropium Respimat vs. 18 μg HandiHaler) were comparable.Using the LLN to define airflow obstruction would have excluded patients in the Tiotropium Safety and Performance in Respimat study with a higher risk of nonfatal major adverse CV events and a lower risk of exacerbation; study outcomes by treatment arm (2.5 μg/5 μg tiotropium Respimat vs. 18 μg HandiHaler) remained similar. Clinical trial registered with www.clinicaltrials.gov (NCT01126437)." @default.
- W2758642068 created "2017-10-06" @default.
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- W2758642068 date "2018-02-01" @default.
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- W2758642068 title "The Effect of Defining Chronic Obstructive Pulmonary Disease by the Lower Limit of Normal of FEV<sub>1</sub>/FVC Ratio in Tiotropium Safety and Performance in Respimat Participants" @default.
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- W2758642068 doi "https://doi.org/10.1513/annalsats.201703-194oc" @default.
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