Abstract
Purpose
Sickle cell disease (SCD) patients with asthma have an increased risk of death. Acute chest syndrome (ACS) is a major cause of mortality in patients with SCD, and ACS may be more common in SCD patients who smoke. The purpose of this study was to test the hypothesis that mortality in young adults with SCD would be greater than that of controls during a 10-year period and to determine whether asthma, reduced lung function, ACS episodes, and/or smoking predicted mortality during the follow-up period.
Methods
The outcomes during a 10-year period were ascertained of SCD patients and race-matched controls who had taken part in a pulmonary function study when they were between age 19 and 27 years. Smoking and asthma status and whether they had had ACS episodes were determined, and lung function was measured at the initial assessment.
Results
Seventy-five subjects with SCD were followed for 683 patient years. There were 11 deaths with a mortality rate of 1.6 deaths per 100 patient years, which was higher than that of the controls; one death in 47 controls was observed for 469 patient years with a mortality rate of 0.2 per 100 patient years (p = 0.03). There were no significant associations of body mass index, recurrent episodes of acute chest, steady state haemoglobin, or gender with mortality. Adjusting for baseline lung function in SCD patients, “current” asthma [hazard ratio (HR) 11.2; 95 % confidence interval (CI) 2.5–50.6; p = 0.002] and smoking [HR 2.7; (95 % CI 1.3–5.5); p = 0.006] were significantly associated with mortality during the 10-year period.
Conclusions
Our results indicate that young adults with SCD should be discouraged from smoking and their asthma aggressively treated.
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Acknowledgments
We acknowledge the contribution to this work of Miss Norma Lewis, Research Nurse, who died before the project was completed. We acknowledge the Caribbean Health Research Council and The Principal, Mona Campus, University of the West Indies who funded this work. Dr. Knight-Madden was supported by an MRC Fellowship and the follow-up study was supported by the Caribbean Health Research Council and a New Initiative Grant, University of the West Indies.
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Knight-Madden, J.M., Barton-Gooden, A., Weaver, S.R. et al. Mortality, Asthma, Smoking and Acute Chest Syndrome in Young Adults with Sickle Cell Disease. Lung 191, 95–100 (2013). https://doi.org/10.1007/s00408-012-9435-3
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DOI: https://doi.org/10.1007/s00408-012-9435-3