Background: Most randomised controlled trials (RCT) for acute coronary syndrome (ACS) exclude patients with significant comorbidities. This may lead to misconceptions regarding applicable treatment modalities and hospital outcomes. The objective of the present analysis was to assess the importance of major comorbidities in patients admitted with ACS.
Methods and results: We used the Charlson comorbidity Index (CCI) to evaluate the impact of chronic comorbidities in 19 496 patients included in the AMIS Plus registry following admission for ACS to 63 Swiss hospitals between 2002 and 2008. Among the studied population, 3881 (19.9%) had at least one comorbidity which would exclude them from most RCT for ACS. When compared to patients with a CCI score of 0, those with higher CCI scores were older, more frequently females, and had higher rates of hypertension, dyslipidaemia and obesity. They were less often treated with guideline-recommended drugs and eligible patients underwent acute reperfusion therapy less frequently. The CCI was associated with an increased rate of in-hospital mortality (3.0%, 5.6%, 8.1% and 13.7% respectively for a CCI score of 0, 1, 2, and 3 or more,
p <0.001), and remained a powerful predictor of hospital mortality by multivariate analysis. For 3323 patients with long term follow-up, mortality 1 year after discharge was similarly correlated with the CCI (1.6%, 2.7%, 8.4%, and 16.0% respectively for a CCI score of 0, 1, 2, and 3 or more,
p <0.001).
Conclusions: Comorbidities have a major impact on clinical presentation, management and outcome of patients admitted to hospital for ACS. This should be taken into account when transposing results obtained from RCT into the “real world”.
Full article