Article

Several risk factors for coronary heart disease (CHD) have been
associated with improved in-hospital survival after myocardial infarction (MI).
We aimed to confirm this paradox and assess whether it extends to long-term
outcome. In addition, we investigated temporal mortality trends. METHODS:
We examined the relation between the presence of four modifiable risk factors for
CHD (hypertension, dyslipidaemia, diabetes mellitus and smoking) and mortality in
14,434 consecutive patients admitted with MI to a coronary care unit from 1985 to
2008. RESULTS: Two-thirds of MI patients (n = 10,003) had at least one risk
factor for CHD on hospital admission. The presence of at least one compared to no
CHD risk factors was associated with a favourable 30-day mortality rate (5% vs.
7%, adjusted odds ratio 0.72, 95% confidence interval (CI): 0.62-0.83). There was
significant interaction between the presence of CHD risk factors and decade of
hospitalization (p = 0.001). The adjusted 10-year mortality hazard ratio (HR) of
at least one CHD risk factor compared to none, was 1.2 (95% CI: 1.0--1.4), 0.89
(0.65--1.2) and 0.89 (0.79--0.99) in 1985--1990, 1990--2000 and 2000--2008,
respectively. Survival improved over time. Adjusted 10-year mortality fell
(adjusted HR [2000--2008 vs. 1985--1990] 0.59 [95% CI: 0.52--0.66] in patients
with, and 0.76 [95% CI: 0.65-0.89] in those without CHD risk factors).
CONCLUSIONS: The presence of at least one modifiable CHD risk factor was
associated with improved outcome after MI. Patients with CHD risk factors
benefited from more substantial mortality reductions during the past few decades.

Langue : ANGLAIS