Key result
Higher circulating IL-6 levels were independently associated with reduced global left-ventricular systolic function (regression coefficient 0.94; 95% CI 0.37-1.51; P=0.001) in asymptomatic individuals.
Why the study?
Is higher circulating interleukin-6 (IL-6) associated with reduced regional and global left-ventricular function in asymptomatic individuals without clinical cardiovascular disease?
Observational (n=894)
Is higher circulating interleukin-6 (IL-6) associated with reduced regional and global left-ventricular function in asymptomatic individuals without clinical cardiovascular disease?
Effect estimate: regression coefficient 0.94 (95% CI 0.37-1.51)
p-value: p=0.001
In asymptomatic individuals without cardiovascular disease, higher IL-6 levels are independently associated with reduced regional and global left-ventricular systolic function, suggesting a link between inflammation and incipient heart failure.
IL-6 linked to subclinical LV impairment in asymptomatic adults; hypothesis-generating and should not yet change practice.
AIMS: We sought to examine the relationship between circulating interleukin-6 (IL-6) level and regional left-ventricular (LV) function among apparently healthy individuals free of cardiovascular disease. METHODS AND RESULTS: Using magnetic resonance myocardial tagging, we determined peak systolic circumferential strain (Ecc) as a measure of regional systolic function in 894 asymptomatic participants in the Multi-Ethnic Study of Atherosclerosis. Ecc was analysed by harmonic phase imaging separately in the LV anterior wall, septum, lateral wall, and inferior wall. Global Ecc was calculated as the average of Ecc in all myocardial segments. We performed multivariable linear regression to evaluate the independent associations between log IL-6 and Ecc, after adjusting for demographic features, cardiovascular risk factors, and markers of subclinical atherosclerosis. The inverse relationships between IL-6 and absolute Ecc were similar in both genders. In multivariable analysis, higher IL-6 level was independently associated with reduced systolic function (less negative Ecc) in the septum [regression coefficient = 1.03 per unit higher log IL-6, 95% confidence interval (CI) 0.26-1.79, P = 0.008] and inferior wall (regression coefficient = 1.65, 95% CI 0.74-2.56, P < 0.001), but not in the anterior wall (P = 0.27) or lateral wall (P = 0.52). Overall, there was an independent inverse association between IL-6 and global Ecc (regression coefficient = 0.94, 95% CI 0.37-1.51, P = 0.001). Compared with C-reactive protein, higher IL-6 level demonstrates a stronger independent association with reduced regional systolic function. CONCLUSION: In asymptomatic men and women without documented cardiovascular disease, there is a strong, independent, inverse relationship between IL-6 and regional LV systolic function. These findings suggest that IL-6 may underlie the pathogenetic link between inflammation, LV dysfunction and incipient heart failure. The observed variable relationships between IL-6 and systolic function across different LV regions warrant further investigations.
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Yan et al. (2010) conducted an observational in Asymptomatic individuals without clinical cardiovascular disease (n=894). Interleukin-6 (IL-6) was evaluated on Global peak systolic circumferential strain (Ecc) (regression coefficient 0.94, 95% CI 0.37-1.51, p=0.001). Higher circulating IL-6 levels were independently associated with reduced global left-ventricular systolic function (regression coefficient 0.94; 95% CI 0.37-1.51; P=0.001) in asymptomatic individuals.
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