(Circulation. 1999;99:2079-2084.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Institute of Cardiology (L.M.B., G.L., G.C., A.G.R., F.G., A.M.), Catholic University of the Sacred Heart, Rome, Italy, and University of Colorado (G.F., C.A.D.), Health Science Center, Denver.
Correspondence to Luigi M. Biasucci, Istituto di Cardiologia, Universitá Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Roma, Italy. E-mail biasucci{at}pelagus.it
BackgroundA growing body of evidence suggests a role for inflammation in acute coronary syndromes. The aim of this study was to assess the role of proinflammatory cytokines, their time course, and their association with prognosis in unstable angina.
Methods and ResultsWe studied 43 patients aged 62±8 years
admitted to our coronary care unit for Braunwald class IIIB
unstable angina. In each patient, serum levels of interleukin-1
receptor antagonist (IL-1Ra), interleukin-6 (IL-6) (which
represent sensitive markers of biologically active IL-1ß and
tumor necrosis factor-
levels, respectively), and troponin T
were measured at entry and 48 hours after admission. Troponin
Tpositive patients were excluded. Patients were divided a posteriori
into 2 groups according to their in-hospital outcome: group 1 comprised
17 patients with an uneventful course, and group 2 comprised 26
patients with a complicated in-hospital course. In group 1, mean IL-1Ra
decreased at 48 hours by 12%, and IL-6 diminished at 48 hours by 13%.
In group 2, IL-1Ra and IL-6 entry levels were higher than in group 1
and increased respectively by 37% and 57% at 48 hours
(P<0.01).
ConclusionsThese findings indicate that although they receive the same medical therapy as patients who do not experience an in-hospital event, patients with unstable angina and with complicated in-hospital courses have higher cytokine levels on admission. A fall in IL-1Ra and IL-6 48 hours after admission was associated with an uneventful course and their increase with a complicated hospital course. These findings may suggest novel therapeutic approaches to patients with unstable angina.
Key Words: interleukins inflammation angina prognosis
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