Inhaled steroids and mortality in COPD: bias from unaccounted immortal time
نویسندگان
چکیده
1. Rahman I. Reproducibility of oxidative stress biomarkers in breath condensate: are they reliable? Eur Respir J 2004; 23: 183–184. 2. Rosias PPR, Dompeling E, Hendriks HJE, Heijnens JWCM, Donckerwolcke RAMG, Jöbsis Q. Exhaled breath condensate in children: pearls and pitfalls. Pediatr Allergy Immunol 2004; 15: 4–19. 3. Van Hoydonck PGA, Wuyts WA, Vanaudenaerde BM, Schouten EG, Dupont LJ, Temme EHM. Quantitative analysis of 8-isoprostane and hydrogen peroxide in exhaled breath condensate. Eur Respir J 2004; 23: 189–192. 4. Rosias PPR, Vernooy JHJ, Dentener MA, et al. The inner coating of condenser systems influences the detection of human albumin in exhaled breath condensate. Eur Respir J 2003; 22: Suppl. 45, 280s.
منابع مشابه
Inhaled steroids and mortality in COPD: bias from unaccounted immortal time.
A recent observational study, which suggested that inhaled corticosteroids (ICS) with or without long-acting bronchodilators are effective at reducing all-cause mortality in chronic obstructive pulmonary disease (COPD) patients, may be subject to immortal time bias. This bias was assessed using a population-based cohort of 3,524 newly treated COPD patients from Saskatchewan, Canada, observed fr...
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