「心筋梗塞による入院、禁煙法施行後に減少
イングランド調査
文献：Sims M et al. Short term impact of smoke-free legislation in England: retrospective analysis of hospital admissions for myocardial infarction. BMJ 2010;340:c2161
心筋梗塞で緊急入院した18歳以上の全患者を対象に、2007年7月施行の禁煙法の短期的影響を調査。2002年7月-2008年9月の入院データの分析から、施行後の入院数にわずかだが有意な減少が見られた（-2.4％）。著者らは、減少がわずかな一因として、イングランドでは禁煙法の前から受動喫煙率が相対的に低かったことを指摘している。
Short term impact of smoke-free legislation in England: retrospective analysis of hospital admissions for myocardial infarction
Michelle Sims, research officer1,2, Roy Maxwell, senior analyst 3, Linda Bauld, professor of social policy2,4, Anna Gilmore, clinical reader in public health, clinical senior lecturer1,2,5
1 School for Health, University of Bath, Bath BA2 7AY, 2 UK Centre for Tobacco Control Studies, University of Bath, Bath , 3 South West Public Health Observatory, Bristol BS8 2RA, 4 Department of Social and Policy Sciences, University of Bath, Bath, 5 London School of Hygiene and Tropical Medicine, London WC1E 7HT
Correspondence to: A Gilmore, School for Health, University of Bath, Bath BA2 7AY a.gilmore@bath.ac.uk
Objective To measure the short term impact on hospital admissions for myocardial infarction of the introduction of smoke-free legislation in England on 1 July 2007.
Design An interrupted time series design with routinely collected hospital episode statistics data. Analysis of admissions from July 2002 to September 2008 (providing five years’ data from before the legislation and 15 months’ data from after) using segmented Poisson regression.
Setting England.
Population All patients aged 18 or older living in England with an emergency admission coded with a primary diagnosis of myocardial infarction.
Main outcome measures Weekly number of completed hospital admissions.
Results After adjustment for secular and seasonal trends and variation in population size, there was a small but significant reduction in the number of emergency admissions for myocardial infarction after the implementation of smoke-free legislation (?2.4%, 95% confidence interval ?4.06% to ?0.66%, P=0.007). This equates to 1200 fewer emergency admissions for myocardial infarction (1600 including readmissions) in the first year after legislation. The reduction in admissions was significant in men (3.1%, P=0.001) and women (3.8%, P=0.007) aged 60 and over, and men (3.5%, P<0.01) but not women (2.5% P=0.38) aged under 60.
Conclusion This study adds to a growing body of evidence that smoke-free legislation leads to reductions in myocardial infarctions. It builds on previous work by showing that such declines are observed even when underlying reductions in admissions and potential confounders are controlled for. The considerably smaller decline in admissions observed in England compared with many other jurisdictions probably reflects aspects of the study design and the relatively low levels of exposure to secondhand smoke in England before the legislation.
c Sims et al 2010
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