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Association of household secondhand smoke exposure and mortality risk in patients with heart failure
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Association of household secondhand smoke exposure and mortality risk in patients with heart failure
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Association of household secondhand smoke exposure and mortality risk in patients with heart failure
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Journal Article
Association of household secondhand smoke exposure and mortality risk in patients with heart failure
2019
Overview
Background
Secondhand smoke (SHS) exposure is a well-established cardiovascular risk factor, yet association between SHS and prognosis of heart failure remains uncertain.
Method
Data were obtained from the US National Health and Nutrition Examination Surveys III from 1988 to 1994. Currently nonsmoking adults with a self-reported history of heart failure were included. Household SHS exposure was assessed by questionnaire. Participants were followed up through December 31, 2011. Cox proportional-hazards models were used to assess the association of household SHS exposure and mortality risk. Potential confounding factors were adjusted.
Results
Of 572 currently nonsmoking patients with heart failure, 88 were exposed to household SHS while 484 were not. There were totally 475 deaths during follow-up. In univariate analysis, household SHS was not associated with mortality risk (hazard ratio [HR]: 0.98, 95% confidence interval [CI]: 0.76–1.26,
p
= 0.864). However, after adjustment for demographic variables, socioeconomic variables and medication, heart failure patients in exposed group had a 43% increase of mortality risk compared with those in unexposed group (HR: 1.43, 95% CI: 1.10–1.86,
p
= 0.007). Analysis with further adjustment for general health status and comorbidities yielded similar result (HR: 1.47, 95% CI: 1.13–1.92,
p
= 0.005).
Conclusion
Household SHS exposure was associated with increased mortality risk in heart failure patients.
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