(Circulation. 1996;94:874-877.)
© 1996 American Heart Association, Inc.
Articles |
the Institute of Cardiology, Catholic University of the Sacred Heart, Rome, Italy, and Istituto di Richerche di Biologia Molecolare "P Angeletti" (A.V., S.A., G. Ciliberto), Pomezia, Italy.
Correspondence to Luigi M. Biasucci, Istituto di Cardiologia, Universita' Cattolica, Largo Francesco Vito 1, 00168 Roma, Italy.
Background Elevated plasma levels of C-reactive protein have been found in the majority of patients with unstable angina. The evidence of elevated levels of acute-phase proteins in unstable angina is in line with a growing body of evidence that suggests that inflammation plays a role in this syndrome and is an indirect sign of increased production of interleukin-6, which is the major determinant of acute-phaseprotein production by the liver. However, in unstable angina, there is no direct proof of the role played by interleukin-6.
Methods and Results We measured levels of interleukin-6 in 38 patients with unstable angina at the time of their admission to the coronary care unit and in 29 patients with stable angina. In the same groups of patients, we also measured C-reactive protein. Interleukin-6 (undetectable, ie, <3 pg/mL, in healthy volunteers) was detectable in 23 (61%) of 38 patients with unstable angina but in only 6 (21%) of 29 with stable angina (P<.01). Median interleukin-6 levels were 5.25 pg/mL (range, 0 to 90 pg/mL) in patients with unstable angina but were below the detection limit of the assay in patients with stable angina (range, 0 to 7 pg/mL). A significant correlation was observed between interleukin-6 and C-reactive protein levels (r=.4, P=.013).
Conclusions Our study demonstrates that raised levels of interleukin-6 are common in unstable angina, correlate with C-reactive protein, and are associated with prognosis, thus confirming the importance of the cytokine pathway for the production by the liver of acute-phase proteins and strengthening the importance of inflammation in this syndrome. Further studies are required to elucidate better the role of interleukins in unstable angina.
Key Words: interleukins angina proteins prognosis pathophysiology
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