The association between smoking and long-term outcomes after non-ST-segment elevation myocardial infarction in older patients

Lan Shen, Eric D. Peterson, Shuang Li, Laine Thomas, Karen Alexander, Ying Xian, Tracy Y. Wang, Matthew T. Roe, Ben He, Bimal R. Shah

Research output: Contribution to journalArticlepeer-review

Abstract

Background Prior studies have observed that smokers have paradoxically favorable 1-year mortality rates after acute coronary syndromes, but it is unknown whether this association extends to long-term outcomes and to older patients. Methods We identified 38,628 patients aged ≥65 years participating in the CRUSADE Registry between February 2003 and December 2006 with non-ST-segment elevation myocardial infarction and linked these patients to Medicare claims data to assess longitudinal outcomes. Cox proportional hazard models were used to examine the association between smoking, 30-day, and long-term outcomes. Results Overall, 4,876 (13%) were current/recent smokers and 33,752 (87%) were nonsmokers. Compared with nonsmokers, smokers were younger and more likely to be male and to receive in-hospital revascularization (all P <.001) but less likely to have hypertension, diabetes mellitus, and renal insufficiency. Compared with nonsmokers, the unadjusted 30-day mortality was lower (8.7% vs 10.3%, P =.0004), but the adjusted 30-day mortality was similar (adjusted hazard ratio [HR] 1.08, 95% CI 0.97-1.20). Over a median of 3.6 years of follow-up, smokers had lower crude long-term mortality rates (53% vs 55% at 6 years, P =.001) but significantly higher long-term mortality rates after adjustment (adjusted HR 1.28, 95% CI 1.21-1.34). Smokers also had higher risks of all-cause readmission (HR 1.13, 95% CI 1.09-1.17) and recurrent myocardial infarction (HR 1.23, 95% CI 1.13-1.34). Conclusions Among older non-ST-segment elevation myocardial infarction patients, we found that smokers had significantly higher long-term risks for both mortality and recurrent myocardial infarction. These results support ongoing efforts to promote smoking cessation, even among older patients.

Original languageEnglish (US)
Pages (from-to)1056-1062
Number of pages7
JournalAmerican heart journal
Volume166
Issue number6
DOIs
StatePublished - Dec 2013
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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