Ignatios Ikonomidis, MD; Felicita Andreotti,
MD, PhD; Emanouel Economou, MD; Christodoulos Stefanadis, MD, FESC; Pavlos Toutouzas, MD, FESC; Petros Nihoyannopoulos, MD,
FESC
From The Imperial College School of Medicine, National Heart
& Lung Institute, Cardiology Department, Hammersmith Hospital, London, UK, and the Department of Cardiology (E.E., C.S.,
P.T.), Ippokration Hospital, Athens, Greece.
Correspondence to Petros Nihoyannopoulos, MD, FACC, FESC, Imperial
College School of Medicine, National Heart & Lung Institute, Cardiology Department, Hammersmith Hospital, Du Cane Road,
London W12 0NN, UK. E-mail petros@rpms.ac.uk.
Background—Proinflammatory cytokines released by injured endothelium
facilitate interaction of endothelial cells with circulating leukocytes and thus may contribute to development
and progression of atherosclerosis. We investigated whether cytokines and C-reactive protein (CRP) are
indicative of myocardial ischemia or of diseased vessels and whether they are influenced by aspirin treatment
in patients with chronic stable angina.
Methods and Results—Plasma macrophage colony stimulating factor
(MCSF), IL-1b, IL-6, and CRP were measured in 60 stable patients after 48-hour Holter monitoring and in 24
matched controls. All patients had angiographic documentation of disease and positive exercise ECGs.
Patients with ischemia on Holter monitoring (n=40) received aspirin or placebo in a 6-week, randomized, double
blind, crossover trial. Blood sampling was repeated at the end of each treatment phase (3 weeks). Compared
to controls, patients had more than twice median MCSF (800 versus 372 pg/mL), IL-6 (3.9 versus 1.7 pg/mL), and
CRP (1.25 versus 0.23 mg/L) levels (P<0.01 for all comparisons). MCSF was related to ischemia on
Holter monitoring (P<0.01), to low ischemic threshold during exercise (P<0.01), and together
with IL-1b to number of diseased vessels (P<0.05). MCSF, IL-6, and CRP were all reduced after 6
weeks of aspirin treatment (P<0.05).
Conclusions—These findings suggest that cytokines are associated
with both ischemia and anatomic extent of disease in patients with stable angina. Reduced cytokine and CRP
levels by aspirin may explain part of aspirin's therapeutic action.
Effect of Short-Term Aspirin Use on C-Reactive Protein
Journal
of Thrombosis and Thrombolysis, Vol. 9, No. 1, January 2000, pages 37-41.
The
effect of aspirin on C-reactive protein as a marker of risk in unstable angina . Journal of the American
College of Cardiology , Volume 37 , Issue 5 , Pages 1266 - 1270 S . Kennon
Abstract
OBJECTIVES
This study was designed to assess the interaction between aspirin and C-reactive protein
(CRP) release in unstable angina.
BACKGROUND
C-reactive protein release in acute coronary syndromes may be a response to myocardial
necrosis or may reflect the inflammatory process that drives atherogenesis. Aspirin has the potential to influence CRP release,
either by its anti-inflammatory activity or by reducing myocardial necrosis. The clinical significance of this potential interaction
has not previously been tested.
METHODS
We conducted a prospective cohort study of 304 consecutive patients admitted with non-ST-elevation
acute coronary syndromes. Serial blood samples were obtained for CRP and troponin I assay. End points were cardiac death and
nonfatal myocardial infarction during follow-up for 12 months.
RESULTS
A total of 174 patients (57%) were taking aspirin before admission. Patients
taking aspirin had lower troponin I concentrations throughout the sampling period, only 45 (26.0%) having concentrations >0.1
mg/l compared with 48 (37.8%) patients not taking aspirin (p = 0.03). Maximum CRP concentrations were also lower in patients
taking aspirin (8.16 mg/l [3.24 to 24.5]) than in patients not taking aspirin (11.3 mg/l [4.15 to 26.1]), although the difference
was not significant. However, there was significant interaction (p = 0.04) between prior aspirin therapy and the predictive
value of CRP concentrations for death and myocardial infarction at 12 months. Thus, odds ratios (95% confidence intervals)
for events associated with an increase of 1 standard deviation in maximum CRP concentration were 2.64 (1.22–5.72) in patients not pretreated with aspirin compared with 0.98 (0.60–1.62)
in patients pretreated with aspirin.
CONCLUSIONS
The association between CRP and cardiac events in patients with unstable angina is
influenced by pretreatment with aspirin. Modification of the acute-phase inflammatory responses to myocardial injury is the
major mechanism of this interaction.